INSTALLATION AND MAINTENANCE TROUBLESHOOTING Content: 1. Precautions before Performing Inspection or Repair 2. Confirmation 3. Flashing LED of Indoor/Outdoor Unit and Primary Judgement 4. How to Check Simply the Main Part 5.
1. Troubleshooting 1.1 Precautions before Performing Inspection or Repair Be cautious during installation and maintenance. Do operation following the regulations to avoid electric shock and casualty or even death due to drop from high attitude. * Static maintenance is the maintenance during de-energization of the air conditioner. For static maintenance, make sure that the unit is de-energized and the plug is disconnected. *dynamic maintenance is the maintenance during energization of the unit.
2. Confirmation (1)Confirmation of Power Supply Confirm that the power breaker operates(ON) normally; (2)Confirmation of Power Voltage Confirm that power voltage is AC 208-230 ±10%. If power voltage is not in this range, the unit may not operate normally. 3.
(1)Models:09/12K: Malfunction and Status Display Table Display of Malfunction of Indoor Unit Malfunction Name 1 Malfunction of Circuit for zero cross detection U8 2 Malfunction protection for jumper cap C5 3 No feedback from indoor motor H6 4 Indoor ambient temp sensor has open or short circuit Indoor evaporator temp sensor has open or short circuit Liquid valve temp sensor has open or short circuit Gas valve temp sensor has open or short circuit Module temp sensor has open or short circuit F1
Wrong connection of communication wire or malfunction of expansion valve (free match) Malfunction of current detection for the complete unit Wrong connection of communication wire or status of detecting malfunction of expansion valve (free match) U5 37 Mode conflict E7 38 Refrigerant reclaiming mode Fo 39 40 41 42 43 44 Oil return under defrosting or heating Nominal cooling or heating (capacity test code) Max.
If malfunction occurs,corresponding code will display and the unit will resume normal until protection or malfunction disappears.
Analysis or processing of some of the malfunction display: 1. Compressor discharge protection operation; malfunction of compressor; malfunction of protection relay; malfunction of discharge sensor; outdoor temperature too high. Processing method: refer to the malfunction analysis in the above section. 2. Low voltage overcurrent protection Possible reason: Sudden drop of supply voltage. 3. Communic ation malfun ction Processing method: Check if communic ation signal cable is connected reliably. 4.
Display Method of Indoor Unit NO. E1 2 Antifreezing protection 3 High discharge temperature protection of compressor 4 Overcurrent protection 5 Communication Malfunction 6 High temperature resistant protection 7 Internal motor (fan motor) do not operate A/C status Possible Causes During cooling and drying operation, except indoor fan operates, all loads stop operation. During heating operation, the complete unit stops.
NO.
Display Method of Indoor Unit NO.
NO. Malfunction Name 30 EEPROM malfunction 31 Charging malfunction of capacitor 32 Malfunction of module temperature sensor circuit 33 34 Module high temperature protection Malfunction of voltage dropping for DC bus-bar Display Method of Outdoor Unit (Indicator has 3 kinds Display Method of Indoor Unit of display status and they will be displayed A/C status Possible Causes circularly every 5s.) Indicator Display (during blinking, □OFF Dual-8 ON 0.5s and OFF 0.
4. How to Check Simply the Main Part Indoor unit: (1)Temperature sensor malfunction Start Is the wiring terminal between temperature sensor and the controller loosened or poor ly contacted? yes Insert the temperature sensor tightly no no Is there short circuit due to tri-pover of the pa rts? Malfunction is eliminated. yes Make the parts upright no no Is the temperature sensor normal according to the Resistance Table? Malfunction is eliminated.
(2)Indoor fan does not operate (H6) Start Pull the blade by hand under de-energization status Whether the blade can operate smoothly Yes Check whether the wiring terminal between indoor fan and main board is loose No Energize and restart upthe unit, test whether the voltage beween motor No Adjust the motor and blade assembly to let the motor can operate smoothly No Is malfunction eliminated Yes Reinsert the wiring terminal of indoor fan No Is malfunction eliminated No terminal 1 and 2 is 28
(3)Jumper cap malfunction (C5) C5 is displayed on the unit. Is there jumper cap on the controller? Yes No Install a matching jumper cap.
(4) Communication malfunction (E6) Poor contact of any line may lead to communication malfuntion. Is there incorrect match between the main board and the display panel or between the indoor and outdoor boards? Is there incorrect connection? Note: 1.Before replacing mainboard of indoor unit, make sure the mainboard for replacement is qualified. The following testes shall be done: a.Check if protective tube FUSE 1 has open circuit. If so, replace it with a protective tube of the same model. b.
Outdoor unit: (1) Capacity charging malfunction (outdoor unit malfunction) (AP1 below is control board of outdoor unit) Main detection point: ● Detect if the voltage of L and N terminal of wiring board is between 210AC-240AC by alternating voltage meter; ● Is reactor (L) well connected? Is connection wire loosened or pull-out? Is reactor (L) damaged" Malfunction diagnosis process: Turn on the unit and wait 1 minute Use DC voltmeter to measure the voltage on the two ends of electrolytic capacitor Voltag
(2) IPM protection, desynchronizing malfunction, phase current of compressor is overcurrent (AP1 below is control board of outdoor unit) Main detection point: If control board AP1 and compressor COMP is well connected? If they are loosened? If the connection sequence is correct? Is voltage input in the normal range (Test the voltage between L, N of wiring board XT by DC voltage meter)? If coil resistance of compressor is normal? Is compressor coil insulating to copper pipe well? If the work load of unit is
Energize and switch on IPM protection occurs after the machine has run for a period of time? Y Use AC voltmeter to measure the voltage between terminal L and N on the wiring board XT) If the voltage between terminal L and N on wiring board XT is within 210VAC~250VAC? N Check the supply voltage and restore it to 210VAC~250VAC Y Restart the unit.
(3) Diagnosis for anti-high temperature, overload protection (AP1 below is control board of outdoor unit) Main detection point: ● If the outdoor ambient temperature is in normal range; ● If the indoor and outdoor fan is running normal; ● If the radiating environment of indoor and outdoor unit is well.
(4) Diagnosis for failure start up malfunction (AP1 below is control board of outdoor unit) Main detection point: ● If the compressor wiring is correct? ● If the stop time of compressor is enough? ● If the compressor is damaged? ● If the refrigerant charging is too much? Malfunction diagnosis process: Energize the unit and start it If the stop time of compressor is more than 3min? If the stop time is not enough and the high and low pressure of system is not balance , please start it after 3min N Y I
(5) Diagnosis for compressor synchronism (AP1 below is control board of outdoor unit) Main detection point: ● If the system pressure is over-high? ● If the work voltage is over-low? Malfunction diagnosis process: Synchronism after energize the unit and start it Synchronism occurred during operation If the stop time of compressor is more than 3min If the outdoor fan works normally? N N Check if the fan terminal OFAN is connected well Replace fan capacitor C1 Y Y If the radiating of unit is well?
(6) Diagnosis for overload and discharge malfunction (AP1 below is control board of outdoor unit) Main detection point: ● If the electron expansion valve is connected well? Is the expansion valve damaged? ● If the refrigerant is leakage? ● If the overload protector is damaged? Malfunction diagnosis process: After the unit de-energized for 20min If the overload protector SAT is well connected? N Y Under ambient temperature, test the resistance of overload protector with ohmic Y N If the wiring termi
(7) PFC (correction for power factor) malfunction (outdoor unit malfunction) (AP1 below is control board of outdoor unit) Main detection point: ● Check if reactor (L) of outdoor unit and PFC capacity are damaged.
(8) Communication malfunction (AP1 below is control board of outdoor unit) Main detection point: ● Check if the connection wire and the built-in wiring of indoor and outdoor unit is connected well and no damaged; ● If the communication circuit of indoor mainboard is damaged? If the communication circuit of outdoor mainboard (AP1) is damaged Malfunction diagnosis process: Start If the unit is operation normal before malfunction N Y Check connection wire of indoor and outdoor unit with circuit diagram
5. Troubleshooting for Normal Malfunction 1. Air Conditioner can't Be Started Up Possible Causes No power supply, or poor connection for power plug Discriminating Method (Air conditioner Status) Troubleshooting Confirm whether it's due to power failure. If yes, After energization, operation indicator isn’t bright wait for power recovery. If not, check power supply circuit and make sure the power plug is and the buzzer can't give out sound connected well.
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