Part 5 Troubleshooting
Contents
1. L8 The speed difference between the previous time and the Display during following time gt 15Hz protection spot inspecting L9 The speed difference between the setting speed Display during and actual speed gt 15Hz protection spot inspecting For 30HP Code Malfunction or protection remark EO Outdoor unit communication error Ausilia eek E1 Phase squence error E2 Communication error between indoor unit and main unit E3 Reserve E4 Outdoor temp sensor error E5 Reserve E6 Reserve E7 Reserve E8 Outdoor unit address error E9 Voltage error HO Communication error between DSP and 780034 H1 Communication error between 0537 and 780034 H2 Outdoor unit qty decrease error a beat H3 Outdoor unit qty increase error PBA ne H4 Three times of P6 protect in 30 minutes H5 Three times of P2 protect in 30 minutes cea iaie H6 Three times of P4 protect in 100 minutes Bi aoa sta H7 Qty of indoor unit decreases H8 Pc lt 0 3MPa H9 P9 protection occur 3 times within 30 minutes PO Inverter top temp protection P1 High pressure protection P2 Low pressure protection P3 Compressor overcurrent protection P4 Compressor discharge temp protection P5 Outdoor condenser high temp protection P6 Inverter module protection P9 Fan protection F1 Current protection No 1 fixed compressor F2 Current protection No 2 fixed compressor F3 Current protection No 3 fixed compressor F4 Current protection2. Display Error One ODU displays P1 and changes to protecting standby state Explanation Supposed Refrigerant is excess Causes Refrigerant does not loop smoothly The refrigerant loop contains air Control board is defective PON Troubleshooting 178 Troubleshooting MCAC VTSM 2011 09 Troubleshooting Pl High pressure protection R22 refngerant system protects at 3 3Mpa recovers at 2 4MPa R410 refrigerant system protects at 4 4MPa recovers at 3 2 MPa Heat exchanging of ODU is not efficient This may be caused by dirty heat exchanger Check the system and fixed abnormal ODU fan running ar flow keeping up the error off to the heat exchanger ODU are too near to each other System s liquid refrigerant loop is blocked Check the system and get rid of the block and make the loop smooth This may be caused by blocked valve pressed tube closed blocked valve Refrigerant is excess In this circumstance the refrigerant s low pressure is high so is the Discharge part of the refrigerant Add some oil to the system if it leaks during the discharge high pressure side while the discharge temperature is low In this circumstance the high pressure is high the System contains air or nitrogen Discharge all the refrigerant Then vacuumize the system and refill the refrigerant Add oil to the system if it leaks cur
3. not enough or system leaks refrigerant Heat exchanger of IDU is inefficient Refrigerant evaporates incompletely and flow into compressor at liquid state System s low pressure loop is blocked or the tube is pressed which cause low pressure turn to too low current turn smaller and tube be frosted System contains nitrogen and air which may cause large current high pressure pressure meter does not stay steady Chip is defective or is installed incorrectly Main control board is defective Troubleshooting System s refrigerant is not enough Clean the heat exchanger and the filter Make sure that the air flows through exchanger smoothly Usually the block attaches at the filter Clean the filter If the filter is blocked by ice the system should be clean Vacuumize the system and recharge the refrigerant If oil leaks during this procedure add oil to the system Reinstalled the chip and replace it with a fine one Replace the main control board Remarks When system appear 3 times PO or P4 protection in 100 minutes system will auto shut down and display H6 malfunction which can recover only by restarting the machine At this time malfunction should be promptly treated to avoid further damage Troubleshooting 177 Troubleshooting 3 12 P1 MCAC VTSM 2011 09 High pressure protection Outdoor Unit P1
4. No 4 fixed compressor F5 Current protection No 5 fixed compressor LO Module error ie L1 DC busbar low voltage protection a L2 DC busbar high voltage protection Sa AR L3 Reserve Display during 164 Troubleshooting MCAC VTSM 2011 09 Troubleshooting spot inspecting and actual speed gt 15Hz protection L4 MCE error synchronize closed loop Display during spot inspecting L5 Zero velocity protection Display during spot inspecting L6 Reserve Display eurin 9 spot inspecting L7 Phase squence error protection Display during spot inspecting The speed difference between the previous time and the Display during L8 PUE t i following time gt 15Hz protection spot inspecting L9 The speed difference between the setting speed Display during spot inspecting Troubleshooting 165 Troubleshooting MCAC VTSM 2011 09 3 2 E1 Phase sequence malfunction Outdoor Unit E1 Display Error A B C terminal of three phase power supply correspond with U V W of the Explanation compressor The compressor could work normally only when they make good matches Supposed 1 Phase sequence of the electricity supply does not match Causes 2 In most circumstance the reason is lack of power phase Troubleshooting Check the 3 phase power supply Check the phases or exchange 2 of the 3 phase Check whether each phase power exists and fasten the
5. exchanger of IDU is inefficient which may be caused by the dirty exchanger or Check the system filter block of air flow the fan not running over and eliminate or running too slowly the obstacles Reinstall the chip or replace it with a fine one Replace the main control board Chip is defective or incorrectly installed Or the low pressure sensor is disconnected Main control board is defective Remarks When system appear 3 times P2 protection in 30 minutes system will auto shut down and display H5 malfunction which can recover only by restarting the machine Malfunction should be promptly treated to avoid further damage Troubleshooting 181 Troubleshooting MCAC VTSM 2011 09 3 14 PSF F2 F3 F4 F5 Inv compressor over current protection Outdoor Unit P3 F1 F2 F3 F4 F5 Display Error ODU displays P3 F1 F2 F3 F4 F5 Explanation Supposed Load on ODU is excess Causes Outdoor heat exchanging is not efficient Refrigerant is excess Compressor or its circuit is defective Control board is defective ao Pond Troubleshooting 182 Troubleshooting MCAC VTSM 2011 09 Troubleshooting P3 F1 F2 F3 F4 F5 Inverter compressor over current protection When current of BP compressor is higher than 11A it will be protected if the current of one fixed compressor is higher than 16A System load is too heavy For example Adjust the load o
6. minutes Refer to P2 for repair H6 There are 3 times P4 protection In 100 minutes Refer to P4 for repair H9 There are 3 times P9 protection In 30 minutes Refer to P9 for repair H7 Indoor unit quantities decreasing malfunction over 3 minutes PO The sensor protection on the top of inv compressor P1 High pressure protection P2 Low pressure protection P3 Inv compressor over current protection P4 Discharge temp sensor protection P5 Pipe temp sensor protection P6 Module protection P7 Fixed 1 current protection P8 Fixed 2 current protection P9 Fan module protection LO Module malfunction L1 DC generatrix low voltage protection L2 DC generatrix high voltage protection L3 Reserved L4 MCE malfunction simultaneously cycle loop L5 Zero speed protection L6 Reserved L7 Wrong phase protection 162 Troubleshooting MCAC VTSM 2011 09 Troubleshooting L8 Speed difference gt 15Hz protection between the front and the back clock L9 Speed difference gt 15Hz protection between the real and the setting speed 18 20HP Code Malfunction or protection remark EO Outdoor unit communication error m Display in auxiliary unit only E1 Phase squence error E2 Communication error between indoor unit and main unit E3 Reserve E4 Outdoor temp sensor error E5 Reserve E6 Reserve E7 Reserve E8 Outdoor unit address error
7. 160 Troubleshooting MCAC VTSM 2011 09 Part 5 Troubleshooting 1 Normal Air Conditioner Phenomenon s0seceeeeeeees 1611 2 Air Conditioner Protection in Common 0 0s0ss0208 1611 3 Malfunction Code and Troubleshooting 2 00 00 162 Troubleshooting MCAC VTSM 2011 09 Troubleshooting 1 Normal Air Conditioner Phenomenon 1 1 When outdoor unit appears white vapor or water the reasons is as follows 1 The fan of outdoor unit stops to begin defrostingO 2 The electromagnet valve sends out the noise when the defrosting begins and ends 3 There is sound like water flowing when running or off and the noise enlarges after running for 3 minutes This is the sound of refrigerant flowing or discharging water gathered by dehumidifying 1 2 Outdoor units send out the noise of pupu for temperature changes to heat exchanger heat expanded or cool compact 1 3 Indoor units send out odor smell because it absorbs the smell of house furniture or smoking 1 4 The running light of indoor unit flickers the reasons are generally as follows 1 Power supply ever failed during running period 2 For 1 to several the following induces the director lighting and the operation stopping Other indoor units running at heating mode induce to this indoor unit cannot run at cooling mode Setting mode conflicts with the fixed mode Stop fan to prevent discharging cool air 1 5 The no priority or waiting director light o
8. Check if 3 phase power lose some phase power joint of power supply Main control board is Replace the main defective control board 166 Troubleshooting MCAC VTSM 2011 09 Troubleshooting 3 3 E2 Communication failure between master ODU and IDU Outdoor Unit E2 Display Master unit displays only Error 1 Timer LED of indoor unit flashes quickly Explanation 2 The number of indoor unit that displayed on outdoor unit changes 3 Some of the indoor unit do not work etc Supposed 1 IDU have the same address or the net address is set incorrectly Causes 2 The signal lines do not work well 3 PQE bus is conducted somewhere Troubleshooting Troubleshooting 167 Troubleshooting MCAC VTSM 2011 09 Communication lines Measure the resistance between P and Q is short or cut off somewhere Some IDU are assigned the same address Some IDU s power are cut off Communication lines is not installed Communication wires are not installed as line shape correctly The signal lines are interfered by high voltage power Communication lines are too close to Remove the interference or use the device that can filter electromagnetic out the interference interference Communication lines l Adjust the lines or use signal repeater are too long The i on eonia Take the IC out and insert it correctly Or replace the IC board is
9. E9 Voltage error HO Communication error between DSP and 780034 H1 Communication error between 0537 and 780034 H2 Outdoor unit qty decrease error Display Nan unit only H3 Outdoor unit qty increase error Display na unit only H4 Three times of P6 protect in 30 minutes H5 Three times of P2 protect in 30 minutes Must be re powered on for the recovery H6 Three times of P4 protect in 100 minutes M stbe re powered on for the recovery H7 Qty of indoor unit decreases H8 Pc lt 0 3MPa PO Inverter top temp protection P1 High pressure protection P2 Low pressure protection P3 Compressor overcurrent protection P4 Compressor discharge temp protection P5 Outdoor condenser high temp protection P6 Inverter module protection P7 Current protection No 1 fixed compressor P8 Current protection No 2 fixed compressor P9 Current protection No 3 fixed compressor LO Module error Display during spot inspecting L1 DC busbar low voltage protection Display during spot inspecting L2 DC busbar high voltage protection Display during spot inspecting L3 Reserve Display durin 9 spot inspecting L4 MCE error synchronize closed loop Display during spot inspecting L5 Zero velocity protection Display during spot inspecting L6 Reserve Display durin 9 spot inspecting L7 Phase squence error protection Display during spot inspecting Troubleshooting 163 Troubleshooting MCAC VTSM 2011 09
10. ST Check the high voltage circuit e g Repair the INV module or Compressor of fan motor may be l corresponding parts short INV module output fail etc EXIST Install the IC again or replaceit witha fine IC l OK The IC fails or its pins do not gt match correctly OK i Replace the main control board Main control malfunction board 172 Troubleshooting MCAC VTSM 2011 09 3 7 HO Troubleshooting Communication malfunction between DSP and 780034 Outdoor Unit HO Display Error DSP IC is used for providing running parameter to compressor IC780034 Explanation send the system s parameter such as T3 T4 ODU power need exhaust temp etc From which DSP IC calculates the compressor s frequency Supposed 1 The power supply of DSP IC fails to work normally Causes 2 Defect of either the DSP or the 780034 Troubleshooting Troubleshooting 3 Disconnection of the IC 780034 pins 4 Defect of main control board 5 Environmental interference Normally the only way to deal with is to replace the main control board 173 Troubleshooting MCAC VTSM 2011 09 3 8 H1 Communication malfunction between IC 0537 and IC 780034 Outdoor Unit H1 Display Error For V4 and V3 series error happens between IC 9177and IC 780034 Explanation For V4 series error happens between IC 0537 and IC 780034 Supposed 1 IC 9177 or IC 0537 or IC 780034 is defective Causes 2 Disconnection
11. an 130 of ODU cooling power Heat exchanger of ODU is Clean the exchanger or check the fan speed inefficient or enhance the distance between ODU System contains much air or Vacuumize the system and refill the refrigerant Add oil to the system if it leaks nitrogen which cause high refrigerant pressure large current pressure meter does not display steady System s liquid refrigerant is blocked which may be caused Check the system and clear away the block by closed valve or pressed pipe Chip is defective or installed 3 Reinstall the chip or replace it incorrectly with a fine one Main control board is Replace the main control defective board 186 Troubleshooting MCAC VTSM 2011 09 Troubleshooting 3 17 P6 Module protection Outdoor Unit P 6 Display Error ODU displays P6 Explanation Supposed 1 DC generatrix is not lined correctly Causes 2 DC generatrix low or high voltage protection 3 MCE malfunction 4 Compressor s frequency changes incorrectly Troubleshooting J Check the DC generatrix eu a a a 9 gt DC generatrix goes form i on INV module board to N pole of current flow OK Check the INV module electrolytic capacity v H4 will be displayed if P6 occurs 3 times in 30 P6 display will disappear in 60s Then press the check button 23 times to find the error code minutes It disappea
12. by state Explanation Supposed 1 Refrigerant is not enough Causes 2 Refrigerant does not loop smoothly 3 Compressor needs more oil 4 Control board is defective Troubleshooting System lacks of refrigerant Discharge Gas loop s filter is with Compressor of condenser is blocked by ice Capillary temp sensor needs more fails to work impurities oil Add refrigerant Pull discharge out Some Add some cooling oil to the compressor Discharge all compressor s the original temp sensor temp is too refrigerant Then refill it high Replace the Take out the filter and puff it with nitrogen control board or the discharge temp Sensor 184 Troubleshooting MCAC VTSM 2011 09 Troubleshooting 3 16 P5 Pipe temp sensor protection Outdoor Unit P5 Display Error One ODU displays P4 and changes to protecting standby state Explanation Supposed System s load is excess Causes Heat exchanging is not efficient Liquid refrigerant is blocked Refrigerant is mixed with impurities POND Troubleshooting Troubleshooting 185 Troubleshooting MCAC VTSM 2011 09 Fasten the port or replace the sensor Adjust IDU or add some ODU IDU cooling power should be less Sensor is defective or the port is loose Load of ODU is excess th
13. door heat exchanging is not efficient 3 Refrigerant is excess 4 Compressor or its circuit is defective 5 Control board is defective Troubleshooting 194 Troubleshooting MCAC VTSM 2011 09 Troubleshooting P8 Current of fixed compressor is larger than 16A y ODU s load is excess S gt Adjust IDU s load or add ODU Discharge part of the Refrigerant is excess refrigerant to normal level lt System contains nitrogen gt Vacuumize the system and or air refill the refrigerant lt System s liquid loop is blocked _ _ Clear away the block lt Compressor s power lines are short Check the compressor s or the port s are loose power lines Compressor is defective Measure the COMpIrESsor terminals resistance Normally they are 2 5Q to each other and infinite to earth C Chip is defective or ia 3 Reinstall the chip or incorrectly installed replace it with a fine one Main control board is defective y Replace the main control unit Troubleshooting 195 3 20 P9 Fan module protection Outdoor Unit aay PQ vas MCAC VTSM 2011 09 Error ODU displays P9 Only V4 series system would display this code Explanation Supposed 1 Control box is too hot Causes 2 Fan is blocked or is defective or is not powered correctly 3 Signal line is loose 4 Fan module is defective Troubleshooting P9 Fan mo
14. dule protection Control box is too hot or Check the heatsink s the heat exchange of fan temperature or move the module is inefficient ODU to a cooler place Check the lines and fasten their terminal Clear away the block or replace the fan s motor Replace the corresponding Power lines and signal lines of the fan module is defective The fan s motor is blocked or defective The power module of the fan is abnormal Fan module is defective Remarks If P9 occurs 3 times in 30 minutes system will auto shut down and display H9 malfunction which can recover only by restarting the machine At this time malfunction should be promptly treated to avoid further damage power module Replace the fan module 196 Troubleshooting
15. f operation board lights 1 6 Auto running or stopping for the timer wrong operation 1 7 Cannot run the reasons are as follows Power is off Manual switch is pulled to off side Fuse is cut Protect device starts at the same time running director lights Timer s setting time is over at the time running director lights 1 8 Heating or cooling is inefficient Filter is block by duct or rubbish The place of air deflector is unfit Fan mode is slight or running mode is fan Setting temperature is unfit Simultaneously choose the heating and cooling mode at the time the no priority or waiting director light of panel lights 2 Air Conditioner Protection in Common 2 1 Compressor protection When power is on or machine stops then restarts right away outdoor unit will run in 3 minutes to protect the compressor from too frequent starts and stops 2 2 When the protection device functions running stops Refer to the following forced to start but not possess the start article and display light lights When cooling running inlet and outlet of outdoor unit are blocked outside strong air blows into outdoor unit s outlet When heating running dust adheres to air filter to block inlet or outlet of outdoor unit Note when protecting please cut manual power switch After checking the reason and solving it restart 2 3 Power fails If power supply fails while machine is running
16. h the compressor Check the compressor 4 5 If the compressor s current is normal the malfunction appears on the control board Please replace it 5 The machine is powered on and P6 appears at once In normal situation LED 1 Flash in 1Hz slowly flash when standby LED 1 On when running LED 2 Off Phenomenon A LED2 red ON LED 1 green Flashes 8 times and stops for 1S then repeat Error Inverter module failure Phenomenon B LED2 red ON LED 1 green Flashes 9 times and stops for 1S then repeat Error Low voltage protection 190 Troubleshooting MCAC VTSM 2011 09 Troubleshooting Here are 3 circumstances a The voltage between the two electrolytic capacitors is less than 450V The AC contactor should be picked up If not there s something wrong with the main control board or the PTC resistors which need to be replace correspondingly b Somewhere is loose in the circuit c The voltage between P and N of CN12 on the main control board should range from 450V to 570V If the voltage between N terminal and middle terminal of CN12 is 15V while error displays it means that the main control board fails Please replace the main control board Phenomenon C LED2 red ON LED1 Green Flashes 10 times and stops for 1S then repeat Error High voltage protection Here are 2 circumstance 6 Three phase power supply s voltage is more than 440V 7 Main control board fails Please replace it Troubleshooting 191 Troublesho
17. in control board 2 Voltage check of module 188 Troubleshooting MCAC VTSM 2011 09 Troubleshooting r 2 1 The voltage between N and P should be 1 41times to local power supply 2 2 The voltage between 1 and 2 should range from 510V to 580V 2 3 The resistance between 1 2 3 4 5 should be infinite If any of them is about 0 which means the module has already been broken down we need to replace the module 3 Compressor s characteristics 3 1 Measure the resistance among the compressor sU V W respectively The resistance should range from 0 9 to 5 Ohms and be the same 3 2 Measure the resistance between the compressor s U V W and GND respectively The resistance should be more or less mega Ohms Troubleshooting 189 Troubleshooting MCAC VTSM 2011 09 3 3 Measure the current of the compressor s U V W terminal respectively which should be more or less the same by e g current flow table clamp They should be 4A at the frequency of 35 Hertz 4 P6 appears after the compressor turns on with difficulties 4 1 Check the module according to step 3 first 4 2 If the module works make the machine standby for 4 hours with power supply which can help heating the refrigerant and oil adequately 4 3 Start the fixed frequency compressor only for 3S to 5S The great startup pressure could wash the impurity away in the tube 4 4 If the compressor s frequency climb to 37 Hertz of above in 2S after turning on then there s something wrong wit
18. normally system will record this When the machine is powered on again the running light of wire controller would flash to inform user about this Press the on off key of wire controller to confirm this before restart the system Note When running if system takes place mistaken operation or lighter please pull down the power Troubleshooting 161 Troubleshooting MCAC VTSM 2011 09 supply switch to cut it off Before restarting machines please press the on off key again as above 3 Malfunction Code and Troubleshooting If there is phenomenon as follows please stop air conditioner running and cut power supply and refer to the following However if the problem insists please contact the customer service center of Midea commercial air conditioner company and offer machine s model and detailed malfunction For 8 16HP Code Malfunction or protection remark EO Reserved E1 Phase sequence malfunction E2 Communication between prime outdoor unit and indoor units E3 Reserved E4 Ambient temp sensor malfunction E5 Reserved E6 Reserved E7 Reserved E8 Reserved E9 Voltage malfunction HO Communication malfunction between IR341 and 780034 H1 Communication malfunction between 0537 and 780034 H2 Reserved H3 Reserved H4 There are 3 times P6 protection In 30 minutes Refer to P6 for repair H5 There are 3 times P2 protection In 30
19. not inserted gt th asame tE correctly Replace the man 3 control board Main control board is defective 168 Troubleshooting MCAC VTSM 2011 09 Remarks Troubleshooting 1 Press indoor unit s receiver button for 5 seconds the indoor unit s communication address code is displayed press it for 10 seconds power code is displayed Check every unit s address code Codes are as follows Director light Running Timer Fan defend cold fan Warning Code 8 4 2 1 Address 0 1 2 3 4 5 6 7 8 9 Capacity x100W 22 28 36 45 56 71 80 90 112 140 HP 0 8 1 0 1 2 1 6 2 0 2 5 3 0 3 2 4 0 5 0 2 If the signal is weak a 1200 resistor should be installed at the end of P and Q line of indoor units and another 1200 resistor should be installed at the end of P and Q of outdoor units Installation refers to the picture following R 1200 KJ eA E Outdoor unit Indoor unit Indoor unit Troubleshooting n Qs IR 1200 E Indoor unit Indoor unit 169 Troubleshooting MCAC VTSM 2011 09 3 4 E4 Ambient temp sensor malfunction Outdoor Unit E 4 Display Error ODU displays E4 Explanation Supposed 1 The sensor terminal is loose Causes 2 The sensor circuit is short or open 3 The main control board s clamp diodes are short or open Troubleshooting 170 Fasten the T4 port Temp sensor i
20. of the pins of IC 780034 3 Environment interference Troubleshooting Normally the only way to deal with is to replace the main control board 174 Troubleshooting MCAC VTSM 2011 09 Troubleshooting 3 10 H7 Outdoor unit quantities decreasing malfunction Outdoor Unit H7 Display Error ODU displays H7 All the ODU standby Explanation Supposed 1 The communication terminal of IDU is loose Causes 2 The voltage transformer of IDU is defective 3 IDU installation is not standard which are not unified powered 4 The control board of IDU is defective Troubleshooting Communication Fasten the port is loose Communication terminal Replace the voltage transformer The transformer voltage Is defective H7 is displayed IDU control board s defective the IDU control board IDU are Replace unified powered not 485 communication IC is defective Troubleshooting 175 Troubleshooting MCAC VTSM 2011 09 3 11 PO The sensor protection on the top of inv Compressor Outdoor Unit PO Display Error One ODU displays PO and changes to protecting standby state Explanation Supposed Refrigerant is not enough Causes Efficiency of outdoor heat exchange is low Troubleshooting 176 Refrigerant does not loops smoothly Control board is defective PON a gt Troubleshooting MCAC VTSM 2011 09 v System s refrigerant is
21. oting 3 18 P7 MCAC VTSM 2011 09 Fixed 1 current protection Outdoor Unit P7 Display Error ODU displays P7 Explanation Supposed 1 Load on ODU is excess Causes 2 Outdoor heat exchanging is not efficient 3 Refrigerant is excess 4 Compressor or its circuit is defective 5 Control board is defective Troubleshooting 192 Troubleshooting MCAC VTSM 2011 09 Troubleshooting P7 Current of fixed compressor is larger than 16A _ y ODU s load is excess A jst IDU s load or add ODU of the Discharge part Refrigerant is excess j gt refrigerant to normal level lt System contains iiia Vacuumize the system and KOL al _ refill the refrigerant lt System s liquid loop is blocked Clear away the block lt lt Compressor s power lines are short 3 Check the compressor s or the port s are loose power lines lt Measure the compressor Compressor is defective P terminals _ resistance Normally they are 2 5Q to each other and infinite to earth q Chip is defective or a 3 Reinstall the chip or replace it with a fine one incorrectly installed lt _ Main control board is defective gt Rabie EeNNN Troubleshooting 193 Troubleshooting 3 19 P8 MCAC VTSM 2011 09 Fixed 2 current protection Outdoor Unit P8 Display Error ODU displays P8 Explanation Supposed 1 Load on ODU is excess Causes 2 Out
22. r evaporating temperature is too high because increase ODU of cooling at high temp or quantity of IDU Heat exchanger of ODU is inefficient which may be caused by the dirty heat changer short circuit of air intake and air Check one by one to outlet fan motor of ODU not work or the speed is low air confirm the malfunction intake and air outlets are blocked space between ODU is too narrow etc Release parts of the refrigerant or all Refrigerant is excess Or air or nitrogen mixed in the system Phenomenon pressure of high the refrigerant Vacuumize and fill and low voltage is high Low pressure is high the refrigerant again Fill refrigerant current is high compressor may make noise oil if the refrigerant oil is out during indicator of pressure gauge shakes this process Check the system over and System s gas side is blocked Compressor is defective eliminate the obstacles Check the line Measure the compressor terminals resistance Normally they are 2 59 to each other and infinite to the earth Chip is defective or incorrectly installed Reinstall the chip or replace it with a fine one PCB is defective Replace the PCB Troubleshooting 183 Troubleshooting MCAC VTSM 2011 09 3 15 P4 Discharge temp sensor protection Outdoor Unit P4 Display Error One ODU displays P4 and changes to protecting stand
23. rent is large the discharge temperature is high compressor makes noise the pressure meter do not display steady Chip is defective or incorrectly installed Or the high pressure sensor is disconnected Control board is defective Reinstall the chp or replace it with a fine one Replace the main control board Troubleshooting 179 Troubleshooting 3 13 P2 MCAC VTSM 2011 09 Low pressure protection Outdoor Unit P2 Display Error One ODU displays P2 and changes to protecting standby state Explanation Supposed Refrigerant is not enough Causes Refrigerant does not loop smoothly Efficiency of indoor heat exchange is low Control board is not defective POON Troubleshooting 180 Troubleshooting MCAC VTSM 2011 09 Troubleshooting P2 Low pressure protection R22 refrigerant system protects at O 03Mpa recovers at O 1MPa R410 2 refrigerant system protects at 0 05MPa recovers at 0 15MPa or protects at 0 14MPa recovers at 0 3MPa Refrigerant is not enough or the Add refrigerant or system leaks refrigerant fix up the system Clear away the System s gas side is blocked Phenomenon block may be discharge temperature is high low pressure is low current is small These are caused by closed EXV valve closed stop valve or blocked filter Clean the filter If the system is block by ice the system should also be clean Heat
24. rs after the machine is re powered Li Low voltage protection Voltage of DC generatrix should be higher than 510 L0 Module protection L2 High voltage protection L8 Compressor S frequency changes faster than 15Hz in 1s L9 Actual frequency has a difference of 15Hz from setting frequency Replace the original module Voltage of power input is high than 580V Connect the compressor to a fine control box Check whether the compressor could start Measure the between the two electrolytic capacitors 510230V is standard Check the voltage commutator circuit Replace the compressor OK Replace the control PCB Troubleshooting 187 Troubleshooting MCAC VTSM 2011 09 1 1D C generatrix detection Normal current direction 1 2 3 4 5 6 LTTTTTITTITETTTTT Direction of the current in DC supply wire which is inning through the inductor should be the same as the direction of arrow marked on the inductor 1 2 Voltage check of DC generatrix 1 2 1 Check the voltage of DC generatrix which is normal between 510V and 580V If less go to next step 1 2 2 Check the rectification circuit Find out any loose in the circuit Moreover check the filter board rectifier stacks Mind DC and AC switch on the meter while doing this 1 2 3 If none of the above works replace the ma
25. s short Replace the sensor or defective Insert the chip The chip s pins do not match correctly correctly or replace it or the chip is with a fine one defective Main control board is Replace the main defective control board Troubleshooting MCAC VTSM 2011 09 Troubleshooting 3 4 E8 Outdoor unit address error Outdoor Unit E8 Display Error ODU displays E8 Explanation Supposed 1 Malfunction of chip or the foot of chip or the mistaken installation of the Causes chip 2 PCB malfunction Troubleshooting E8 Outdoor unit address error Reinstall the chip or install the Malfunction of chip or the foot of chip or the same model of the chip on the mistaken installation of the chip Correct anit do make s re AF it is the installation is curved semicircle alignment malfunction of the chip PCB Malfunction For example PCB is effected with damp Change the PCB Troubleshooting 171 Troubleshooting MCAC VTSM 2011 09 3 6 E9 Voltage malfunction Outdoor Unit E9 Display Error ODU displays E9 All the ODU standby Explanation Supposed 1 The voltage of power supply is too high or too low Causes 2 The voltage of power supply fluctuates 3 The IC is loose or main board fails Troubleshooting E9 Voltage malfunction Voltage of power supply scans is too high or too low gt Make power supply steady 4 OK J ee EXI
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