Gree Free Match GUHD18-24-28k Maintenance & Faults
Contents
1. maintenance merigdiior Refer to troubleshooting for H6 for maintenance Malfunction of the IDU fan motor The IDU fan motor can t operate method in details Malfunction of the ODU fan motor The ODU fan motor can t operate Pea point oh mamenance eee el Malfunction of compressor Compressor can t operate iit points or maintenance metnoa for 3 Horizontal Louver Can t Swing Possible Causes Discriminating Method Air conditioner Status Troubleshooting es boua nnect wir rdin wiring diagram Wrong wire connection or poor Check the wiring status according to circuit ee RIT fa ek hies A l connection diagram irmly g Refrigerant is leaking Stepping motor is damaged Stepping motor can t operate Repair or replace stepping motor Others are all normal while horizontal louver Main board is damaged ee ere hedaes the main board with the same model 42 9 Installation and Maintenance Service Manual 4 ODU Fan Moior Can t Operate Discriminating method air conditioner status Troubleshooting Connect wires according to wiring diagram to make sure all wiring terminals are connected Wrong wire connection or poor Check the wiring status according to circuit diagram Change compressor oil and refrigerant If no better replace the compressor with a new one Connect wires according to wiring diagram to Wrong wire connection or poor Check the wiring status according to circuit a make sure all wiring term2. 00M Q Replace the compressor Malfunction is eliminated Replace the outdoor mainboard Yes amp 30 9 Installation and Maintenance Service Manual 2 PFC protection malfunction capacity charging malfunction Main checking points If the wiring of the induction is connected well and if the induction is broken f the mainboard is broken Flow chart For 18K Check if power supply is normal Turn on the unit Yes after power supply resumes normal Power supply is abnormal Replace the outdoor mainboard Installation and Maintenance 31 32 For 24 28K Check If the power supply is normal Turn on the unit after the power supply resumes to normal situation Power supply is abnormal Check if the outdoor induction is broken The induction is broken Replace the induction Malfunction is eliminated Replace the outdoor mainboard Service Manual Installation and Maintenance Service Manual 3 Compressor desynchronizing malfunction Main checking points ifthe pressure of the system is too high ifthe eletric expansion valve is working normally or it is broken ifthe radiation of the unit is good Flow chart The unit appears desynchronizing as soon as energizing and starting The stop duration of the compressor is longer than 3min Yes The wiring of the compressor is No Reconnect the wire proper connected pr
3. Service Manual 9 Maintenance 9 1 Precautions before Performing Inspection or Repair There are high capacity electrolytic capacitors on the outdoor mainboard Thus even the power is cut off there is high voltage inside the capacitors and it needs more than 20min to reduce the voltage to safety value Touching the electrolytic capacitor within 20min after cutting the power will cause electric shock If maintenance is needed follow the steps below to discharge electricity of electrolytic capacitor after power off 1 Open the top cover of outdoor unit and then remove the cover of electric box cover electric box cover outdoor mainboard AP1 Fig 29 2 As shown in the fig below connect the plug of discharge resistance about 1000hm 20W if there is no discharge resistance you can use the plug of soldering iron to point A and B of electrolytic capacitor There will be sparks when touching them Press them forcibly for 30s to discharge electricity of electrolytic capacitor outdoor mainboard AP 1 18K 24 28K discharge resistance or plug of soldering iron 3 After finish discharging electricity measure the voltage between point A and B with universal meter to make sure if electricity discharging is completed in order to prevent electric shock If the voltage between the two points is below 20V you can perform maintenance safely Installation and Maintenance ee eo 27 Service Manual 9 2 Flashing LED of Ind
4. ambient temperature sensor is open short circuited Hardware malfunction F1 Indoor evaporator temperature sensor is open short circuited Hardware malfunction F2 Liquid valve temperature sensor is open short circuited Hardware malfunction b5 Gas valve temperature sensor is open short circuited Hardware malfunction b7 Modular temperature sensor is open short circuited Hardware malfunction P7 Outdoor ambient temperature sensor is open short circuited Hardware malfunction F4 Outdoor condenser inlet pipe temperature sensor is Hardware malfunction A5 open short circuited commercial Outdoor condenser middle pipe temperature sensor is Hardware malfunction F4 open short circuited Outdoor condenser outlet pipe temperature sensor is Hardware malfunction A7 open short circuited commercial Outdoor discharge temperature sensor is open short Hardware malfunction F5 circuited Communication malfunction Hardware malfunction E6 Malfunction of phase current detection circuit for compressor Hardware malfunction U1 Compressor demagnetization protection view maindo code HE Malfunction of voltage dropping for DC bus bar ad U3 Module high temperature protection inpaligh noa comroller wian P8 A 200s displayed directly on Refrigerant lacking or blockage protection of system not M FO f f nixietube after 200s available for residential ODU Charging malfunction of capacitor Hardware malfunction PU High pressure protection of system Hardware malfunction E1 Low pressure p
5. e of the compressor is connected well and correctly No f the refrigerant charging amount is too much Charge the refrigerant according to the service manual No mainboard Lite he nat nto Yes No The stop duration of the unit is not enough the high and low pressure of the system is not balanced restart it after 3min 9 Installation and Maintenance Installation and Maintenance Service Manual 6 Temperature sensor malfunction Main checking points Ifthe temperature sensor is damaged or broken Ifthe terminal of the temperature sensor is loosended or not connected If the mainboard is broken Flow chart Check whether the wiring terminal between temperature sensor and controller is loosened or poorly contacted No Eliminate the malfunction No Check whether the i Replace the temperature sensor temperature senspr is normal according to with the same model resistance table Eliminate the malfunction6 Replace the controller with the same model i 37 38 7 DC fan malfunction Main checking points if the outdoor fan is blocked by foreign objects The connection wire of DC fan is connected reliably If itis loose Flow chart Turn on the unit after removing the foreign objects Check if the outdoor fan is blocked by foreign objects Yes No Turn on the unit after the connectio
6. g for Air Conditioner Possible Causes Discriminating Method Air conditioner Status Troubleshooting Set temperature is improper Observe the set temperature on remote controller Adjust the set temperature Rotation speed of the IDU fan f motor is settoo low Small wind blow Set the fan speed at high or medium Filter of indoor unit is blocked Check the filter to see it s blocked Clean the filter Installation position for indoor uniter ee dpi rg A Adjust the installation position and install the and outdoor unit is improper dee q rainproof and sunproof for outdoor unit Discharged air temperature during cooling is higher than normal discharged wind temperature Discharged air temperature during heating is Find out the leakage causes and deal with it lower than normal discharged wind temperature Add refrigerant Unit s pressure is much lower than regulated range Malfunction of 4 way valve Blow cold wind during heating Replace the 4 way valve Discharged air temperature during cooling is higher than normal discharged wind temperature Discharged air temperature during heating is Malfunction of capillary lower than normal discharged wind temperature Replace the capillary Unit t pressure is much lower than regulated range If refrigerant isn t leaking part of capillary is blocked Flow volume of valve is The pressure of valves is much lower than that Malfunction of horizontal louver Horizontal louver can t swing Fiet a point ol
7. gh voltage protection PH PFC protection HC The four way valve is abnormal U7 9 3 Malfunction Checking and Elimination 1 IPM protection malfunction Main checking point Ifthe input voltage of the unitis within normal range Ifthe connection wire of compressor is connected well Is it loose If the connection sequence is correct lf the resistance of compressor coil is normal If the isolation of compressor coil with copper pipe is good Ifthe unitis overloaded If the heat radiation of the unit is good Ifthe refrigerant charge is suitable Flow chart Installation and Maintenance o Service Manual Energize the unit Please check 1 ifthe indoor and outdoor heat exchanges are dirty if there is obstacle to affect the radiation 2 if the indoor and outdoor fans are running normally If the above cases are existed 3 if the pressure of the system is too high 4 if the refrigerant is too much which causes the high level of pressure Correct according to the service manual and then energize the If the wire of compressor is connected unit to operate well and correctly Reconnect the wire of the compressor according to the est the resistance between hip correct wiring method he three phases If the resistance is normal No Yes Test the isolation impedance between the three phases ofthe compressor and thecopper pipe Yes If the resistance is above 5
8. hod for Normal Malfunction 1 Air Conditioner Can t be Started Up Possible Causes Discriminating Method Air conditioner Status Troubleshooting Confirm whether it s due to power failure If yes No power supply or poor After energization operation indicator isn t bright wait for power recovery If not check power connection for power plug land the buzzer can t give out sound supply circuit and make sure the power plug is connected well Wrong wire connection between indoor unit and outdoor unit Under normal power supply circumstances or poor connection for wiring operation indicator isn t bright after energization erminals Check the circuit according to circuit diagram land connect wires correctly Make sure all iring terminals are connected firmly Make sure the air conditioner is grounded reliably Make sure wires of air conditioner is connected correctly Check the wiring inside air conditioner Check hether the insulation layer of power cord is damaged if yes place the power cord eo for air switch is After energization air switch trips off Select proper air switch After energization operation indicator is bright Malfunction of remote controller while no display on remote controller or buttons have no action After energization room circuit breaker trips off at Electric leakage for air conditione g once Replace batteries for remote controller Repair or replace remote controller 2 Poor Cooling Heatin
9. inals are connected connection diagram Measure the capacity of fan capacitor with an Capacity of compressor is universal meter and find that the capacity is out o damaged he deviation range indicated on the nameplate of fan capacitor Power voltage is a little low or Use universal meter to measure the power SUPPIY c Aspe eauibwithivoltagereg latoi high voltage The voltage is a little high or low 99 quip ge reg z Use universal meter to measure the resistance Coil of compressor is burnt out me Repair or replace compressor between compressor terminals and it s 0 Cylinder of compressor is blockediCompressor can t operate Repair or replace compressor 6 Air Conditioner is Leaking Discriminating method air conditioner status Troubleshooting Drain pipe is blocked Water leaking from indoor unit fal Mie oreign objects inside Ihe grain Drain pipe is broken Water leaking from drain pipe Replace drain pipe Wrapping is not tight bed a omithe pipe connechon placet Wrap it again and bundle it tightly 7 Abnormal Sound and Vibration Discriminating method air conditioner status When turn on or turn off the unit he panel and other parts will There s the sound of PAPA Normal phenomenon Abnormal sound will expand and there s abnormal disappear after a few minutes sound When turn on or turn off the unit here s abnormal sound due i Normal phenomenon Abnormal sound will 7 ae Water running sound can be heard i o flow of ref
10. n wire is properly connected If the connection wire i Yes of DC fan is loose No Replace the outdoor mainboard Service Manual Installation and Maintenance Service Manual 8 Communication malfunction Main checking points f the connection wire between the indoor unit and outdoor unit is connected well if the wires inside the unit is connected well lf the indoor mainboard or outdoor main board is broken Flow chart Communication malfunction of some indoor units De energize check if the connection wire of indoor and outdoor unit and the wire of the eletric box is connected correctly Reconnect according to Connected correctly theswidne diagcam Eliminate the malfunction Yes De energize change the communication wire of the well communicated indoor unit and malfunction indoor unit then energize the unit and wait for 3min The malfunction indoor unit resumes normal Replace outdoor mainboard Replace the mainboard of the malfunction indoor unit Installation and Maintenance o 39 Service Manual All the indoor units appear communication malfunction De energize check if the connection wire of indoor and outdoor unit and the wire of the eletric box is connected correctly Reconnect according to Connected correctly No Eliminate the malfunction the wiring diagram Yes Yes q De energize check if the connection wire betwee the outdoor mainboard and
11. oor Outdoor Unit and Primary Judgement 1 Requirement of malfunction display When several malfunctions happen at the same time malfunction codes will be displayed circularly 2 Malfunction display method 1 Hardware malfunction it will be displayed immediately please refer to Malfunction status sheet 2 Operation status it will be displayed immediately please refer to Malfunction status sheet 3 Other malfunction It will be displayed after the compressor has been stopped for 200s please refer to Malfunction status sheet Note when the compressor starts up again malfunction display waiting time 200s will be cleared 3 Malfunction display control Indoor unit displays malfunction code as shown in the sheet below ODU communication light will be off for 1s and then blink for 1s circularly 4 Viewing malfunction code through remote controller Enter viewing malfunction code pressing light button for 6 times within 3S to view malfunction code Exit viewing malfunction code pressing light button for 6 times within 3S or after the malfunction code is displayed for 5min 28 Malfunction status sheet Malfunction name Malfunction type Nixie tube Zero cross detection circuit malfunction Hardware malfunction U8 Malfunction protection of jumper cap Hardware malfunction C5 Feedback of without IDU motor Hardware malfunction H6 Indoor
12. operly Yes a No Eliminate the malfunction Yes Replace the eletric expansion valve The eletric expansion valve is broken Eliminate the malfunction Yes Replace the outdoor mainboard Eliminate the malfunction Replace the compressor Installation and Maintenance o 33 34 Desynchronizing happens during operation Outdoor unit is working No Yes Unit radiation is good No Yes Input voltage is normal No Yes Refrigerant amount is too much Yes No Replace the outdoor mainboard Eliminate the malfunction Yes Replace the compressor Check if fan terminal is connected well Improve radiation situation of the unit such as cleaning the heat exchanger improve ventilation Turn on the unit after the power supply voltage resumes normal Charge refrigerant according to the service manual Service Manual Replace the fan capacitor Replace the outdoor unit Installation and Maintenance Service Manual 4 Compressor overload diacharge protectionmalfunction Main checking points Ifthe eletric expansion valve is connected well or it is broken If there is refrigerant leakage Ifthe overload protector is broken Flow chart If the overload protector is connected well No Yes Check the resistance between the two ends of the overload protector in ambient temperature ifthe resistance is bel
13. ow 1k No Yes If the wiring of the eletric expansion valve Reconnect according No gt is coonected well to the wiring diagram Yes Replace the overload protector Check the coil of the eletri expansion valve replace it if itis broken Eliminate the malfunction No Check the refrigerant status if there is refrigerant leakage recharge it according to the service manual Eliminate the malfunction No Yes gt Replace outdoor mainboard Note the detection method of the coil of the eletric expansion valve there is five pieces of coil of the eletric expansion valve the resistance of one of them the leftmost or the rightmost one is almost the same as the resistance of other terminal within 100 J udge the condition of the electronic expansion valve through detecting these resistance Installation and Maintenance o Service Manual 5 Start failuremalfunction Main checking points Ifthe connection wire of the compressor is connected properly ifthe stop duration of the compressor is sufficient Ifthe compressor is broken ifthe refrigerant charging amount is too much Flow chart Energize and start the unit If the stop duration of the compressor is longer than 3min No econnecttheconnectionwire ofthe compressoraccording to the wiring diagram Eliminate the malfunction If the connection wir
14. rigerant inside air disappear after a few minutes conditioner Foreign objects inside the indoor Remove foreign objects Adjust all parts unit or there re parts touching There s abnormal sound fro indoor unit position of indoor unit tighten screws and stick ogether inside the indoor unit damping plaster between connected parts Foreign objects inside the outdoo Remove foreign objects Adjust all parts unit or there re parts touching There s abnormal sound fro outdoor unit position of outdoor unit tighten screws and ogether inside the outdoor unit stick damping plaster between connected parts Short circuit inside the magnetic During heating the way valve has abnormal Replace magnetic coil coil lelectromagnetic sound Abnormal shake of compressor Outdoor unit gives out abnormal sound Adjust ig SUPPONI TOOL Mat OFCOMprESSOI ighten the bolts If add too much refrigerant during maintenance Abnormal sound inside the compressor please reduce refrigerant properly Replace compressor for other circumstances Replace the compressor capacitor Abnormal sound inside the compressor Installation and Maintenance 43
15. rotection of system reserved Hardware malfunction E3 Installation and Maintenance Service Manual Viewing malfunction code Compressor overload protection va jails suka ed H3 200s displayed directly on nixietube after 200s Indoor unit and outdoor unit do not match Hardware malfunction LP Malfunction of memory chip Hardware malfunction EE Wrong connection of communication wire or malfunction of dn i Hardware malfunction electronic expansion valve Malfunction of complete units current detection Hardware malfunction U5 Malfunction protection of outdoor fan 1 Hardware malfunction L3 Detection status of wrong connection of communication wire dd f i Operation status or malfunction of electronic expansion valve Mode conflict Operation status E7 Refrigerant recycling mode Operation status Fo X fan Operation status AL Defrosting or oil return in heating mode Operation status H1 Start failure of compressor Lc High discharge temperature protection of compressor E4 Overload protection E8 Whole unit overcurrent protection E5 Compressor phase current protection Viewing malfunction code P5 Compressor desynchronizing through remote controller within H7 Compressor phase lacking phase inverse protection 200s displayed directly on Ld IPM modular protection nixietube after 200s H5 DC bus bar low voltage protection PL DC bus bar hi
16. the filter board according to the wiring diagram Reconnect according to Connected correctly the wiring diagram Yes lt 4 J Replace the Yes connection wire The connection wire is broken No Check if there is power input bewtween the netrual wire and live wire of the outdoor mainboard Replace the filter board of the outdoor unit There is power input No Eliminate the malfunction Replace the outdoor mainboard Replace indoor mainboard Resume communication End amp 40 9 Installation and Maintenance Service Manual 9 Anti high temperatureand overload malfunction Main checking points Ifthe outdoor ambient temperature is within the normal range ifthe indoor fan and outdoor fan are running normally Ifthe indoor and outdoor radiation environment is good Flow chart If the outdoor ambient temperature 5 Yes is above 53 C No If the indoor and outdoor radiation Yes is insufficient No Ifthe outdoorfan is working normally No Yes Replace outdoor mainboard End Installation and Maintenance o Itis a normal protection please operate the unit after the outdoor ambienttemperature has changed Improve the radiation environment of the unit Check if the terminal of the fan is connected well if the fan is broken Replace fan capacitor Replace outdoor fan 41 Service Manual 9 4 Maintenance Met
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