Service Manual
Contents
1. Food Service Service Manual The Customer s Company NU VU Food Service Systems 5600 13 Street Menominee MI 49858 1 800 338 9886 email service mjrind com Service Fax 906 863 6322 Web Site www nu vu com The Customer s Company 2 NU VU Food Service Systems 5600 13 Street Menominee MI 49858 1 800 338 9886 email service mjrind com Service Fax 906 863 6322 Web Site www nu vu com NU VU Service Manual About NU VU About NU VU NU VU has been in existence as a product line for over twenty one years Its units are in use throughout the United States and Canada and have been exported to other parts of the world NU VU continually modifies and updates its equipment to improve the capabilities as innovations become available This enables the user to obtain better and more useful results as well as simplifying installation and repair NU VU currently manufactures an entire line of equipment in Menominee Michigan All of the equipment is tested under anticipated operating conditions prior to shipment NU VU Food Service Systems offers the widest range and variety of equipment through the varied use of heat moisture steam and smoke options NU VU has over a period of time developed a series of Ovens Proofers Steamers Smokers and Warmers designed to provide maximum performance with minimum energy requirements and care by the operator The Customer s Company 3 NU VU Food Service Systems 5600 13 Street2. The most common equipment configurations will be described in this manual If the piece of equipment being serviced does not match one of the configurations listed refer to the model number s specific manual provided with the equipment The NU VU Service Department is usually able to provide assistance over the telephone if provided with the model number and serial number In certain cases concerning very old equipment it may be necessary to provide NU VU with general sketches of equipment or parts Oven Proofer Models An Oven Proofer is a combination of a convection oven on top of a proofer There are several combinations of oven and proofer sizes available The current model numbers used by NU VU contain the size of the oven and proofer for example the model number UB 6 8 indicates a six pan oven and eight pan proofer Certain NU VU model numbers have been in use for such a long period of time that changing the model number would create confusion for example the model number OP 2 or OP 2FM which is a six half pan oven and eighteen half pan proofer Oven Proofers can be catorgarized two different ways Oven Proofers with Side Mounted Controls and Oven Proofers with Top Mounted Controls There are several equipment options available with Oven Proofers and these options are available in both configurations These equipment options will be detailed following the overviews Photo 1 OP 2FM Side Mounted Controls Oven Proofers with sid
3. 906 863 6322 Web Site www nu vu com NU VU Service Manual Troubleshooting Gas Ovens Y Verify proper operation of the transformer The LINE side of the transformer should be 120 Volts The LOAD side of the transformer should be 24 Volts to ground If there are not 24 Volts from the LOAD side of the transformer then the transformer is faulty and requires replacement Y Set the oven thermostat to 400 At this point the oven gas ignitor coils should begin to glow and the gas valves should open There is a burner system for each side of the oven unless the unit is a gas conveyor oven The oven is safety wired If one side fails to ignite the ignition system will shut both sides down and initiate the protect mode If the ignitor coil s do not glow and the gas valves do not open then one of the HSI Hot Surface Ignition modules is faulty and requires replacement If one side will not light then swap the modules and verify that the problem moved with the module Y When the gas valves are open there should be a minimum of five inches water column pressure for natural gas or eleven inches water column pressure for propane gas If the gas valve s fails to open but 24 Volts DC is present at the valve then the valve is faulty and requires replacement Y Check the glow coil ignitors for proper operation Ensure that there are 24 Volts between the ignitor and ground when the ignition module calls for ignition Verify that the ignitors glow and
4. Site www nu vu com NU VU Service Manual Equipment Warranty Policy Warranty Period MDO 5 10 1 Year 1 Year BO 10DX oam Yer Yes PCO 32G cose Yer Yer 1 PMA 5 12 pw Yea iYea Eximglamps PMO38 Yea tYear Excuding Lamps 6 Months PO 5 6 Months PO 5 PROTO iYer Yes OS PROB Yer vas PROWa2 Year Yer RWi Year Yam 1 RPzWi ver Yer part Yer 2Yes SS RISMANS Year yoa RTS TS7G XBQ 3B G SSWi Yer ver 4 SIMT amp SIM2 Yer iver 2 Years Deeg TYear Exdudnglamps TMC 18 1 Year 1 Year Excluding Lamps UBig Yer 2Yems The Customer s Company 5 NU VU Food Service Systems 5600 13 Street Menominee MI 49858 1 800 338 9886 email service mjrind com Service Fax 906 863 6322 Web Site www nu vu com NU VU Service Manual Equipment Warranty Policy Warranty Pre Authorization UB 12 18G 1 Year 1 Year COP 12G UB 4 2 8 2 Years UB E4 8G UB E5 5G PUBESTH Ier Yes D r Yer Yer EAR Ye Yer oo ai Yea Ye xoi e Yer omms ve Yer XO 1P 1 Year 1 Year a up oue ea Warranty Pre Authorization All warranty work must be pre authorized by NU VU NU VU
5. and install a new fuse Set the power rocker switch to the ON position If the fuse blows upon start up check the proofer lights or power rocker switch for a direct short If the fuse does not blow upon start up set the proofer controls to their ON positions one at a time in order to determine which control is causing the fuse to blow Proofer will not Heat Conditions Power indicator light is illuminated the interior proofer lights are illuminated and the proofer fan motor is operating but the proofer will not heat v With the proofer powered up and running set the proofer HEAT thermostat to 200 Verify that the proofer HEAT thermostat indicator light illuminates If the indicator light illuminates skip to the next step If the indicator light does not illuminate the 62ma thermostat fuse for solid state thermostats only located near the thermostat circuit board may be blown If the fuse is blown replace with a new fuse spare fuses may be found in a bag located near the power terminal block If the fuse is good verify that there is proper voltage ovens located in the U S will have 120 Volts to ground to the COM and NO terminals on the thermostat circuit board If there is proper voltage to the COM terminal but not proper voltage at the NO terminal the thermostat is faulty and requires replacement If the proofer thermostat is mechanical and the proofer thermostat indicator light does not illuminate verify the proper voltage into a
6. email service mjrind com Service Fax 906 863 6322 Web Site www nu vu com NU VU Service Manual Equipment Warranty Policy Warranty Parts Return Procedure Ignitor 5 Hour 5 Hour 1 Hour Ignition Module Water Solenoid Belt Speed Control Conveyor Oven Drive Motor Conveyor Oven Conveyor Belt Drive Idler Shaft Assembly Conveyor Oven Transformer e NU VU will pay for Straight Time only the customer has the option to pay the difference between Straight Time and Overtime rates if emergency service is required e NU VU will pay a maximum of fifty miles or one hour of travel one way or a total of one hundred miles or two hours travel Only one round trip will be paid The customer will be billed by the local service agent for any travel charges in excess of the allowances listed above e The customer is required to place the service call with NU VU and the NU VU Service Department will determine what replacement parts may be necessary and provide these parts to the local service agent prior to the service call e NU VU will pay for 2 Day Air UPS freight on critical parts such as elements thermostats contactors motors and power switches non critical parts such as timers and buzzers will be sent Regular Ground UPS freight unless the customer agrees to pay the extra freight charges e NU VU will not pay Handling Charges Warranty Parts Return Procedure The following procedure shall be
7. is proper voltage to the COM terminal but not proper voltage at the NO terminal the thermostat is faulty and requires replacement If the proofer HUMIDITY thermostat is mechanical and the proofer HUMIDITY thermostat indicator light does not illuminate verify the proper voltage into and out of the thermostat If there is voltage into the mechanical thermostat but not out of the thermostat then the thermostat requires replacement With the proofer HUMIDITY thermostat activated indicator light illuminated check the HUMIDITY element lead wire for proper amp draw If the HUMIDITY element does not heat then it is faulty and requires replacement Note Humidity is relative to heat Optimal proofing conditions are 105 F and 9096 humidity typically a setting of 3 Hotter environments are capable of holding more moisture Ensure that the proofer is not above 120 F it may not be a case of too little humidity but of excessive heat Proofer has no Humidity Automist Proofers The humidity function in NU VU proofers equipped with the Automist option operates on a timer The Automist system consists of a repeat cycle timer potentiometer and solenoid valve The repeat cycle timer cycles every 45 seconds The amount of ON time is determined by the potentiometer a control setting of 1 is about 5 seconds a setting of 10 is about 3 seconds The water enters the proofer through a spray nozzle located near the squirrel cage proofer fan Y Y Y
8. will provide a warranty authorization number for any warranty work To receive an authorization number the Model Number and Serial Number must be provided to NU VU Note The Serial Number located near the terminal block will only appear on units manufactured after July 1995 Warranty Conditions Products must be installed and maintained in accordance with NU VU instructions Users are responsible for the suitability of the products to their application There is no warranty against damage resulting from accident abuse alteration misapplication inadequate storage prior to installation or improper specification or other operating conditions beyond NU VU s immediate control Claims against carrier damage in transit must be filed by the buyer therefore the buyer must inspect the product immediately upon receipt The Customer s Company 6 NU VU Food Service Systems 5600 13 Street Menominee MI 49858 1 800 338 9886 email service mjrind com Service Fax 906 863 6322 Web Site www nu vu com NU VU Service Manual Equipment Warranty Policy Warranty Limitations Warranty Limitations NU VU s warranty for parts and labor is subject to the following limitations e Wear and tear due to normal operation on the following parts e Light Bulbs e Door Gaskets e Door Handles and Catches e Any part that is damaged due to customer abuse including the following e Proofer Water Pan customer allows proofer to operate with empty water pan
9. Controls Photo 7 UB E4 8 Oven Proofers with Top Mounted Controls have the controls mounted inside a header located on top of the Oven Proofer This configuration reduces the amount of floor space needed but places the controls further away from the user Refer to Photos 7 through 9 for Control Component Location The Top Mounted Control Oven Proofer has the identical interior Proofer layout as the Side Mounted Control Oven Proofer Photo 8 UB E3 9 Oven Interior 1 0N OFF Switches 7 Oven Thermostat 13 Proofer Heat Thermostat 2 0ven Motor 8 Buzzer 14 Fan Speed Switch 3 Proofer Humidity Thermostat 9 Timer 15 Power Terminal Block 4 Motor Capacitor 10 Contactors 16 0ven Fan 5 Element Lead Connection 11 0ven Element 17 Serial Number Location 6 0ven Sensor 12 Cooling Fan The Customer s Company 11 NU VU Food Service Systems 5600 13 Street Menominee MI 49858 1 800 338 9886 email service mjrind com Service Fax 906 863 6322 Web Site www nu vu com General Overview of Equipment Configurations NU VU Service Manual Gas Oven Models Gas Oven Models NU VU gas ovens may be equipped in either the Side Mounted Control configuration or the Top Mounted Control Configuration The majority of NU VU gas ovens are either reach in or roll in floor models with Top Mounted Controls Refer to Photos 10 through 12 for control component location Photo 11 CUB 12R 1 Inducer Motor 2 Inducer Monitor Photo 10 Flue A
10. Ensure that all water supply valves are in the open position Check the spray nozzle for clogging Set the HUMIDITY control to the 3 setting and observe the HUMIDITY indicator light The indicator light should illuminate every 45 seconds and stay lit for about 1 second If there is no resistance across the purple and red wires then the potentiometer is faulty and requires replacement If the repeat cycle timer does not energize the solenoid valve then the repeat cycle timer is faulty and requires replacement f the indicator light illuminates every 45 seconds and the spray nozzle is not clogged then check the solenoid valve for proper operation Replace the solenoid valve if necessary Proofer Motor will not Run Conditions Power indicator light is illuminated and the interior proofer lights are illuminated Y Check the motor wiring for proper wire connections v If the motor is supplied with the proper voltage but will not run then the motor is faulty and must be replaced The Customer s Company 19 NU VU Food Service Systems 5600 13 Street Menominee MI 49858 1 800 338 9886 email service mjrind com Service Fax 906 863 6322 Web Site www nu vu com
11. Menominee MI 49858 1 800 338 9886 email service mjrind com Service Fax 906 863 6322 Web Site www nu vu com NU VU Service Manual Equipment Warranty Policy Warranty Period Equipment Warranty Policy NU VU s products are warranted against defects in workmanship and materials No other express warranty written or oral applies No person is authorized to give any other warranty or assume any other liability on behalf of NU VU except by written statement from an officer of NU VU Warranty Period The warranty period begins on the day that the equipment ships from the NU VU factory in Menominee Michigan There is a thirty day grace period for installation so a product with a one year labor two year parts warranty would actually receive thirteen months labor and twenty five months parts warranty Refer to Table 1 Equipment Warranty Period for NU VU equipment warranty periods Table 1 Equipment Warranty Periods MODEL LABOR WARRANTY PARTS WARRANTY OLD MODEL AWPig KC Yes SS COMBI 12S COMBI 5EZ 2 Years COMBESEZG iver iYer esa Yer Yer ewi iYer Yer CUBiz 1Yem 2Yems CUB 12RG CUBi ivar J Yes DOW1 iYer J Yer ESR 1000 ESR 1000 won Yer J Yer The Customer s Company 4 NU VU Food Service Systems 5600 13 Street Menominee MI 49858 1 800 338 9886 email service mjrind com Service Fax 906 863 6322 Web
12. e Proofer Fan Motor customer does not follow proofer dry out procedure or regularly clean the bottom of the proofer which would remove excess moisture e Power supply problems including the following e Insufficient voltage e Incorrect voltage e Damage to electrical components caused by a power surge or spike e Equipment incorrectly installed Equipment not supplied with separate neutral and ground Incorrect location of High Leg in the case of 240Volt 3Phase supply e Damage to electrical components caused by incorrect power cord or breaker Procedural problems customer did not follow proper procedures There is nothing found wrong Calibration NU VU equipment is calibrated at the factory prior to shipment The equipment is moved from the initial place of installation unless NU VU agrees in writing to continue the warranty after the relocation e Adjustments due to changing environmental conditions or normal on going use Warranty Time and Expenses Allowed The following are allowable charges related to completed warranty work e Use the Standard Time Allowances for Warranty Repairs Table 2 to determine allowable time to perform the listed repairs Table 2 Time Allowances for Warranty Repairs Standard Time Allowances for Warranty Repairs Repair Performed Repair Time Test Time Total Time Oven Heating Element Quantity 1 The Customer s Company 7 NU VU Food Service Systems 5600 13 Street Menominee MI 49858 1 800 338 9886
13. e mounted controls have the controls mounted in an enlarged cornerpost alongside the Oven Proofer Refer to Photo 1 The door hinging determines where the controls are mounted The controls are mounted opposite the door hinges This configuration uses more floor space but places the controls within closer reach Refer to Photos 2 through 6 for electrical component location The Customer s Company 9J NU VU Food Service Systems 5600 13 Street Menominee MI 49858 1 800 338 9886 email service mjrind com Service Fax 906 863 6322 Web Site www nu vu com NU VU Service Manual General Overview of Equipment Configurations Oven Proofer Models 1 Terminal Block 8 Contactor s 2 Hi Limit switch 9 Serial Number Location 3 0N OFF Switch 10 Timer s 4 ON OFF Switch 11 Buzzer s 5 Oven Thermostat 12 0ven Thermostat Fuse 6 Oven Elements 13 Oven Fan 7 Oven Thermostat Sensor Photo 3 OP 2FM Oven Interior Heat Elements 1 Heat Thermostat 1 Heat Elements 1 2 Humidity Element 2 Humidity 2 Fan Squirrel Cage Blower 3 Fan Blade Thermostat Wheel 4 Sensors 3 Fuses for 3 Spray Nozzle Thermostats 4 Sensor Behind Panel The Customer s Company 10 NU VU Food Service Systems 5600 13 Street Menominee MI 49858 1 800 338 9886 email service mjrind com Service Fax 906 863 6322 Web Site www nu vu com NU VU Service Manual General Overview of Equipment Configurations Oven Proofer Models Top Mounted
14. followed for the return of parts to the factory for credit consideration e All parts received by NU VU must have a completed RETURN AUTHORIZATION FORM which is supplied with the replacement parts A copy appears in the appendix of this manual e Package all return parts securely so that in transit damage cannot occur e Prepay shipment Any parts returned collect will be refused by our Receiving Department e Package all invoices including labor in an envelope marked WARRANTY PAPERS inside the return parts package e Ae soon as parts are tested and confirmed to be defective credit will be issued against them If the engineering test shows the component is not defective and is in good working condition it may be returned to you along with your request for payment Warranty Period on Replacement Parts Replacement parts will be warranted for a period of six months from the date of shipment from the NU VU factory located in Menominee Michigan the conditions applied to warranty parts listed above also apply to replacement parts The Customer s Company 8 NU VU Food Service Systems 5600 13 Street Menominee MI 49858 1 800 338 9886 email service mjrind com Service Fax 906 863 6322 Web Site www nu vu com NU VU Service Manual General Overview of Equipment Configurations Oven Proofer Models General Overview of Equipment Configurations NU VU manufactures over one hundred different models of Commercial Kitchen Equipment
15. l protection It is possible that the motor has shut down due to overheating When the oven has cooled down power the oven back up and watch the oven motor If the motor runs but shuts down again when the oven reaches a temperature of 400 then the thermal protector is faulty and the oven motor requires replacement v If the motor is supplied with the proper voltage but will not run then the motor is faulty and must be replaced Oven Timer will not Time Down or Sticks v The oven timer is a self contained component without repairable parts If the oven timer consistently sticks or stops it requires replacement The Customer s Company 16 NU VU Food Service Systems 5600 13 Street Menominee MI 49858 1 800 338 9886 email service mjrind com Service Fax 906 863 6322 Web Site www nu vu com NU VU Service Manual Troubleshooting Gas Ovens Oven Timer Counts Down but will not Sound the Buzzer Y Ensure that the timer reaches the 0 position and does not stop prior to reaching 0 Y Ensure that the wire connections to the timer are secure v Verify that the proper voltage is supplied to the buzzer from the timer Y IT the proper voltage is supplied to the buzzer and the buzzer volume is turned all the way up then the buzzer is faulty and requires replacement Y If there is not proper voltage supplied from the timer and the timer is in the 0 position then the timer is faulty and requires replacement The Customer s Compa
16. nd out of the thermostat If there is voltage into the mechanical thermostat but not out of the thermostat then the thermostat requires replacement Y With the proofer HEAT thermostat turned up so the indicator light is illuminated check each element lead wire for proper amp draw Replace the necessary proofer heating elements Proofer has no Humidity Manual Fill Proofers Conditions Power indicator light is illuminated the interior proofer lights are illuminated and the proofer fan motor is operating but the proofer will not heat v With the proofer powered up and running set the proofer HUMIDITY thermostat to 10 Verify that the proofer HUMIDITY thermostat indicator light illuminates If the indicator light illuminates skip to the next step If the indicator light does not illuminate the 62ma thermostat fuse for solid state thermostats only located near the thermostat circuit board may be blown If the fuse is blown replace with a new fuse spare fuses may be found in a The Customer s Company 18 NU VU Food Service Systems 5600 13 Street Menominee MI 49858 1 800 338 9886 email service mjrind com Service Fax 906 863 6322 Web Site www nu vu com NU VU Service Manual Troubleshooting Proofers bag located near the power terminal block If the fuse is good verify that there is proper voltage equipment located in the U S will have 120 Volts to neutral to the COM and NO terminals on the thermostat circuit board If there
17. nsure that the power supply cord is properly attached to the unit s power terminal block Y Check to ensure that the proper voltage is supplied to the unit s power terminal block verify against the voltage requirements listed on the equipment label Y Ensure that the wire connections to the power breaker rocker switch are properly attached Y Verify that the correct voltage is supplied to the input terminal of the breaker rocker switch If the correct voltage is supplied to the breaker rocker switch and the switch does not close then the breaker rocker switch must be replaced Note f the 20 amp fuse blows repeatedly upon start up turn all the oven controls to their OFF positions and install a new fuse Set the power rocker switch to the ON position If the fuse blows upon start up then check the oven lights or power rocker switch for a direct short If the fuse does not blow upon start up set the oven controls to their ON positions one at a time in order to determine which control is causing the fuse to blow Oven will not Heat Conditions Power indicator light is illuminated and the interior oven lights are illuminated but the oven will not heat Y Verify that all gas supply valves to the unit are in the open position v Verify that the gas supply valve located on the side of the oven is in the open position Y Check the oven fan for operation with the oven door closed If the fan is not operating check the door switch for proper
18. ny 17 NU VU Food Service Systems 5600 13 Street Menominee MI 49858 1 800 338 9886 email service mjrind com Service Fax 906 863 6322 Web Site www nu vu com NU VU Service Manual Troubleshooting Proofers Proofers Proofer has no Power Y The power switch circuit breaker if so equipped may be tripped Set the switch all the way to the OFF position then reset the switch to the ON position If the proofer is equipped with a power rocker switch check the 20 amp fuse located at the bottom front of the unit or located near the power supply inlet at the rear of the equipment Replace the fuse with an SC20 Buss fuse Y The power supply circuit breaker or fuse may be tripped blown Reset the breaker or replace the fuse Y Check to ensure that the power supply cord is properly attached to the unit s power terminal block Y Check to ensure that the proper voltage is supplied to the unit s power terminal block verify against the voltage requirements listed on the equipment label Y Ensure that the wire connections to the power breaker rocker switch are properly attached Y Verify that the correct voltage is supplied to the input terminal of the breaker rocker switch If the correct voltage is supplied to the breaker rocker switch and the switch does not close then the breaker rocker switch is faulty and requires replacement Note f the 20 amp fuse blows repeatedly upon start up turn all the proofer controls to their OFF positions
19. ons to the power breaker rocker switch are properly attached Y Verify that the correct voltage is supplied to the input terminal of the breaker rocker switch If the correct voltage is supplied to the breaker rocker switch and the switch does not close then the breaker rocker switch must be replaced Note f the 20 amp fuse blows repeatedly upon start up set all the oven controls to their OFF positions and install a new fuse Set the power rocker switch to the ON position If the fuse blows upon start up then check the oven lights or power rocker switch for a direct short If the fuse does not blow upon start up set the oven controls to the ON position one at a time in order to determine which control is causing the fuse to blow Oven will not Heat Conditions Power indicator light is illuminated and the interior oven lights are illuminated but the oven will not heat Y Check the oven fan for operation with the oven door closed If the fan is not operating check the door switch for proper operation Y Ensure that the required voltage is present at the unit s power terminal block Y With the oven door closed and the oven powered up set the oven thermostat to 400 Verify that the oven thermostat indicator light illuminates If the indicator light illuminates skip to the next step If the indicator light does not illuminate the 62ma thermostat fuse for solid state thermostats only located near the thermostat circuit board may be blo
20. operation v Ensure that the required voltage is present at the unit s power terminal block Y Ensure that the exhaust inducer is operating correctly and that the inducer monitor switch is closed when the oven power switch is set to ON Y With the oven door closed and the oven powered up set the oven thermostat to 400 Verify that the oven thermostat indicator light illuminates If the indicator light illuminates skip to the next step If the indicator light does not illuminate the 62ma thermostat fuse for solid state thermostats only located near the thermostat circuit board may be blown If the fuse is blown replace with a new fuse spare fuses may be found in a bag located near the power terminal block If the fuse is good verify that there is proper voltage ovens located in the U S will have 120 Volts to ground to the COM and NO terminals on the thermostat circuit board If there is not proper voltage at the NO terminal the thermostat is faulty and requires replacement If the oven thermostat is mechanical and the oven thermostat indicator light does not illuminate verify the proper voltage into and out of the thermostat If there is voltage into the mechanical thermostat but not out of the thermostat then the thermostat requires replacement Y Ensure that the Hi Limit switch is not Open The Customer s Company 15 NU VU Food Service Systems 5600 13 Street Menominee MI 49858 1 800 338 9886 email service mjrind com Service Fax
21. rior to reaching 0 Y Ensure that the wire connections to the timer are secure v Verify that the proper voltage is supplied to the buzzer from the timer Y Ifthe proper voltage is supplied to the buzzer and the buzzer volume is turned all the way up then the buzzer is faulty and requires replacement Y If there is not proper voltage supplied from the timer and the timer is in the 0 position then the timer is faulty and requires replacement The Customer s Company A NU VU Food Service Systems 5600 13 Street Menominee MI 49858 1 800 338 9886 email service mjrind com Service Fax 906 863 6322 Web Site www nu vu com NU VU Service Manual Troubleshooting Gas Ovens Gas Ovens Oven has no Power Y The majority of NU VU gas ovens operate using 120 Volts Typically there is a 120 Volt 15 amp cord provided with the oven however if the oven is combined with a proofer the standard terminal block is used Y The power switch circuit breaker if the oven is so equipped may be tripped Set the switch all the way to the OFF position then reset the switch to the ON position If the oven is equipped with a power rocker switch then check the 20 amp fuse located at the bottom front of the unit or located near the power supply inlet at the rear of the equipment Replace the fuse with an SC20 Buss fuse Y The power supply circuit breaker or fuse may be tripped blown Reset the breaker or replace the fuse Y Check to e
22. ssembly Switch 3 Flame Sensor 4 gnitor Burner The Customer s Company 12 Menominee MI 49858 NU VU Food Service Systems 5600 13 Street 1 800 338 9886 email service mjrind com Service Fax 906 863 6322 Web Site www nu vu com NU VU Service Manual Troubleshooting Electric Ovens Troubleshooting This guide is designed to provide general troubleshooting procedures covering the majority of NU VU equipment If there are systems in the particular unit being serviced that are not covered by this guide refer to the specific owner s manual that was provided with that particular unit Electric Ovens Oven has no Power Y The power switch circuit breaker if the oven is so equipped may be tripped Set the switch all the way to the OFF position then reset the switch to the ON position If the oven is equipped with a rocker type power switch then check the 20 amp fuse located at the bottom front of the unit or located near the power supply inlet at the rear of the equipment Replace the fuse with an SC20 Buss fuse Y The power supply circuit breaker or fuse may be tripped blown Reset the breaker or replace the fuse Y Check to ensure that the power supply cord is properly attached to the unit s power terminal block Y Check to ensure that the proper voltage is supplied to the unit s power terminal block verify against the voltage requirements listed on the equipment label Y Ensure that the wire connecti
23. tactor for proper amp draw Replace the necessary oven heating elements Oven Motor will not Run Y v v Ensure that the oven power switch is set to ON Ensure that the fan speed switch if so equipped is in an operating position not OFF Ensure that the oven door is closed and that it is engaging the oven door switch The oven door switch supplies power to both the oven thermostat and the oven motor If the oven thermostat indicator light will come on when the oven thermostat is turned up then the door switch is good Check the motor wiring for proper wire connections If the oven is currently hot then let the oven cool down power the oven down NU VU motors are equipped with internal thermal protection It is possible that the motor has shut down due to overheating When the oven has cooled down power the oven back up and watch the oven motor If the motor runs but shuts down again when the oven reaches a temperature of 400 then the thermal protector is faulty and the oven motor requires replacement If the motor is supplied with the proper voltage but will not run then the motor is faulty and must be replaced Oven Timer will not Time Down or Sticks 4 The oven timer is a self contained component without repairable parts If the oven timer consistently sticks or stops it requires replacement Oven Timer Counts Down but will not Sound the Buzzer v Ensure that the timer reaches the 0 position and does not stop p
24. that they are not cracked or broken If the ignitor s is broken or will not glow then the ignitor s is faulty and requires replacement Y f the ignitors glow and the gas valves open but the burner s will not light then the ignitor s placement may need to be adjusted Gently bend the ignitor mounting bracket so that the ignitor s is closer to the burner v f the burners will light but shut down within a few seconds then the flame sensor s may require adjustment or replacement The flame sensor should be mounted so that the top of the inner blue flame crosses the flame sensor Ensure that the flame sensor probe is not touching any metal parts including the burner or the chassis of the unit If the flame sensor slides loosely inside the ceramic insulator then the flame sensor is faulty and requires replacement Oven Motor will not Run Y Ensure that the oven power switch is set to ON v Ensure that the fan speed switch if so equipped is in an operating position not OFF Y Ensure that the oven door is closed and that it is engaging the oven door switch The oven door switch supplies power to both the oven thermostat and the oven motor If the oven thermostat indicator light will come on when the oven thermostat is turned up then the door switch is good Y Check the motor wiring for proper wire connections v If the oven is currently hot then let the oven cool down power the oven down NU VU motors are equipped with internal therma
25. wn If this fuse is blown replace with a new fuse spare fuses may be found in a bag located near the power terminal block If the fuse is good verify that there is proper voltage ovens located in the U S will have 120 Volts to ground to the COM and NO terminals on the thermostat circuit board If there is not proper voltage at the NO terminal the thermostat is faulty and requires replacement If the oven thermostat is mechanical and the oven thermostat indicator light does not illuminate verify the proper voltage into and out of the thermostat If there is voltage into the mechanical thermostat but not out of the thermostat then the thermostat requires replacement Y Ensure that the Hi Limit switch is not Open The Customer s Company 13 NU VU Food Service Systems 5600 13 Street Menominee MI 49858 1 800 338 9886 email service mjrind com Service Fax 906 863 6322 Web Site www nu vu com NU VU Service Manual Troubleshooting Electric Ovens With the oven thermostat activated indicator light illuminated verify the proper operation of the contactor The coil of the contactor requires 120 Volts to operate If there are 120 Volts to the coil of the contactor and the contactor does not engage then the contactor is faulty and requires replacement If the contactor engages and supplies the proper voltage across it s poles to the elements then skip to the next step With the contactor engaged check each element lead wire at the con
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