Air conditioners are rather complex and in many cases you need experience and skills to maintain and repair them. However, minor issues can be resolved without professional help. To find out what type of malfunction your Daikin air conditioner is suffering and determine whether you can try troubleshooting it on your own, refer to the table below.
Daikin McQuay IM 934-5 air troubleshooting
| Trouble | Cause | Cure |
| 1. Blowers won’t operate on cool | a. No power | a. Check supply line fusses, circuit breakers, and be sure the power is on. Blown fuses would indicate circuit over- loading. a short circuit, or a ground condition in the circuit Voltage supply to the equipment should be checked. Voltage underload must be within 10% of voltage given on date plate. |
| b. Faulty touchpad/thermostat. | b. Replace, | |
| c. Loose connections at push-button switch. | c. Tighten. | |
| 2. Blowers operate on cool but compressor does not start | a. Thermostat set too high. | a. Adjust Rotate control knob to ‘Cooler.” |
| b. Heat valve is open and heat is on. | b. Close heat valve. | |
| c. Low voltage. | c. Check as above. | |
| d. Faulty touchpad/thermostat. | d. Replace. | |
| e. Faulty connection at touchpad/thermostat | e. Tighten. | |
| f. Defective wiring to thermostat. | f. Replace. | |
| g. Loose connections at compressor terminals. | g. Tighten. | |
| h. Wiring to compressor terminals defective. | h. Replace. | |
| i. Loose connections in compressor overload device. | i. Tighten. | |
| j. Starting capacitor malfunctions (open circuited, short circuited or loss of capacity), | j. Replace. | |
| k. Defective compressor motor (short circuited, open circuited, grounded). | k. Ship cooling chassis prepaid to nearest Daikin McQuay authorized warranty station. | |
| 3. Blowers run on cool and compressor starts but stops after a short interval. | a. Operation of overload device due to overloading com- pressor motor. | a. Check voltage supply. Clean condenser inside and out. Check at outside face of condenser for recirculation of condenser air. Put air “splitters’ in, if missing. Check com- pressor for short circuit. If defective, ship cooling chassis to nearest McOuay authorized warranty station. |
| 4. Blowers run on cool and compressor starts and runs, but compressor occasionally stops (on overload device). | a. Low voltage due to overload circuits within building or throughout the local power system. Due to varying power demands, this condition might exist only at certain times during the day or on very hot days. | a. Run separate electric line to equipment Consult local power company. |
| b. High voltage due to fluctuations in local power system; usually occurs during low load periods of the day | b. Consult local power company. | |
| c. Partial short circuit in compressor motor. Under normal loading a compressor with a partial short circuit might appear to be operating all right; increased condensing air temperature might then cause a short. | c. If confirmed, ship cooling chassis prepaid to nearest McOuay authorized warranty station. | |
| 5. Compressor starts and runs on cool but blowers do not run. | a. Faulty touchpad/thermostat. | a. Replace. |
| b. Open circuited blower motor. | b. Replace. | |
| c. Blower rubbing against its housing. | c. Adjust blower motor or blower wheel position. | |
| d. Bearings on blower motor seized. | d. Replace motor | |
| e. Loose connection at touchpad/thermostat. | e. Tighten. | |
| 6. Compressor starts and runs on cool, but fan motor starts, then stops. | a. Operation of the internally connected overload device due to a short circuit in blower motor. | a. Replace motor |
| b. Windings, rubbing of blower wheel or lack of lubrication in blower motor bearings. | b. Adjust blower wheel or motor, or replace. | |
| 7. Equipment gives electrical shock. | a. Grounded electrical circuit. | a. Eliminate ground. |
| 8. Insufficient cooling capacity. | a. Equipment standing too long without being run. | a. If the air conditioner is allowed to stand for an extended length of time without being run on cool, it is possible for all the refrigerant to become absorbed in the oil inside the compressor and refrigeration circuit. If this should hap- pen there will be no cooling until the necessary working pressures have been established. This will take about 5 minutes of continuous running. |
| b. Insufficient airflow through condenser due to: 1) Dirty condenser. 2) Obstructed louver on outer cabinet or wall box. 3) Condenser blower/fan not running. 4) Condenser blower/fan not up to speed. 5) Condenser blower/fan slipping on motor shaft. 6) Recirculation of condenser air. |
b. 1) Clean. 2) Remove obstructions. 3) Check same as in the case of malfunctioning condenser air blower. 4) Check for correct voltage. Replace blower motor if necessary 5) Adjust blower position and tighten setscrews. 6) Correct as in No 3 above. |
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| c. Insufficient airflow through evaporator due to: 1) Dirty evaporator. 2) Ice on evaporator coils. 3) Dirty air filter. 4) Obstructed discharge grilles. 5) Evaporator blower motor not running. 6) Evaporator blower motor not up to speed. 7) Evaporator motor slipping on motor shaft. |
c. 1) Clean. 2) Turn equipment off to let ice melt 3) Clean or replace. 4) Remove obstructions. 5) Check as in No. 1. 6) Check for correct voltage. Replace motor if necessaiy. 7) Adjust blower wheel position and tighten setscrew |
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| d. Heat load in room exceeds capacity of equipment. | d. Refer to original load calculations, recalculate heat load. | |
| e. Windows and doors in room are open | e. Close them. | |
| f. Compressor not pumping, indicated by: 1) Low wattage. 2) Condenser not warm, evaporator only partially cool or not at all. |
f. Ship prepaid to nearest Daikin McQuay warranty station. | |
| g. Restricted capillary or strainer. 1) Frost on capillary or strainer 2) Low wattage. 3) Condenser not warm. 4) Evaporator partially frosted, only partially cool or not at all. |
g. Ship prepaid to nearest McOuay warranty station. | |
| 9. Too much cooling. | a. Thermostat set too low. | a. Adjust. |
| b. Defective thermostat | b. Replace. | |
| 10. “Sweating.” | a. Condensate drain from evaporator to condenser plugged. | a. Remove obstructions to water flow. |
| b. Insulating seals on equipment damaged. | b. Adjust or replace. | |
| c. Evaporator blower motor not up to speed. | c. Check for correct voltage. Replace motor if necessary. | |
| d. Evaporator blower incorrectly positioned. | d. Tighten. | |
| 11. Blowers won’t operate on Heat. | a. No power. | a. See No. 1. |
| b. Check HFLO installation/correction | b. Open heat valve or turn on heating system. | |
| c. Heat is off (equipment with heat fan lock out. | c. Replace. | |
| d. Faulty touchpad/thermostat | d. Tighten. | |
| e. Loose connections at touchpad/thermostat | e. Adjust. Rotate control knob to “warmer”. | |
| f. Thermostat set too low. |
Daikin FTXS20K2V1B air troubleshooting
| Symptom | Check Item | Details of Measure |
| The unit does not operate. | Check the power supply. | Check if the rated voltage is supplied. |
| Check the type of the indoor unit. | Check if the indoor unit type is compatible with the outdoor unit. | |
| Check the outdoor temperature. | Heating operation cannot be used when the outdoor temperature is 24°C or higher, and cooling operation cannot be used when the outdoor temperature is below -10°C. | |
| Diagnose with remote controller indication. | — | |
| Check the remote controller addresses. | Check if address settings for the remote controller and indoor unit are correct. | |
| Operation sometimes stops. | Check the power supply. | A power failure of 2 to 10 cycles stops air conditioner operation. (Operation lamp OFF) |
| Check the outdoor temperature. | Heating operation cannot be used when the outdoor temperature is 24°C or higher, and cooling operation cannot be used when the outdoor temperature is below -10°C. | |
| Diagnose with remote controller indication. | — | |
| The unit operates but does not cool, or does not heat. | Check for wiring and piping errors in the connection between the indoor unit and outdoor unit. | — |
| Check for thermistor detection errors. | Check if the thermistor is mounted securely. | |
| Check for faulty operation of the electronic expansion valve. | Set the unit to cooling operation, and check the temperature of the liquid pipe to see if the electronic expansion valve works. | |
| Diagnose with remote controller indication. | — | |
| Diagnose by sen/ice port pressure and operating current. | Check for refrigerant shortage. | |
| Large operating noise and vibrations | Check the output voltage of the power module. | — |
| Check the power module. | — | |
| Check the installation condition. | Check if the required spaces for installation (specified in the installation manual) are provided. |
Daikin FTX20KV1B air troubleshooting
| Case | Description / what to check |
| The air conditioner does not operate | |
| OPERATION lamp Is off. | Has the circuit breaker been tripped or the fuse blown? Is there a power failure? Are batteries set in the remote controller? |
| OPERATION lamp Is blinking. | To protect the system, the air conditioner may stop operating after sudden large voltage fluctuations. It automatically resumes operation in about 3 minutes. |
| The air conditioner suddenly stops operating | |
| OPERATION lamp Is on. | To protect the system, the air conditioner may stop operating after sudden large voltage fluctuations. It automatically resumes operation in about 3 minutes. |
| OPERATION lamp Is blinking. | Is there anything blocking the air inlet or air outlet of the indoor unit or outdoor unit? Stop operation and after turning off the circuit breaker, remove the obstruction. Then restart operation with the remote controller. If the OPERATION lamp is still blinking, check the error code and consult your dealer. |
| The air conditioner does not stop operating | |
| The air conditioner continues operating even after operation is stopped. | Immediately after the air conditioner is stopped The outdoor unit fan continues rotating for about another 1 minute to protect the system. While the air conditioner is not in operation When the outdoor temperature is high, the outdoor unit fan may start rotating to protect the system. |
| The room does not cool down / warm up | |
| Case | Description / what to check |
| Air does not come out. | In HEAT operation. The air conditioner is warming up. Wait for about 1 to 4 minutes. During defrosting operation, hot air does not flow out of the indoor unit |
| Air does not come out / Air comes out. | Is the airflow rate setting appropriate? Is the airflow rate setting low, such as “Indoor unit quiet” or “Airflow rate 1”? Increase the airflow rate setting. Is the set temperature appropriate? Is the adjustment of the airflow direction appropriate? |
| Air comes out. | Is there any furniture directly under or beside the indoor unit? Is the air conditioner in ECONO operation? Are the air filters dirty? Is there anything blocking the air inlet or air outlet of the indoor unit or outdoor unit? Is a window or door open? Is an exhaust fan turning? |
| Mist comes out | |
| Mist comes out of the indoor unit | This happens when the air in the room is cooled into mist by the cold airflow during COOL “—” or other operation. |
| Remote controller | |
| The unit does not receive signals from the remote controller or has a limited operating range. | The batteries may be exhausted. Replace both batteries with new dry batteries AAA.LR03 (alkaline). Signal communication may be disabled if an electronic-starter-type fluorescent lamp (such as inverter-type lamps) is in the room. Consult your dealer if that is the case. The remote controller may not function correctly if the transmitter is exposed to direct sunlight. |
| LCD is faint, is not working, or the display is erratic. | The batteries may be exhausted. Replace both batteries with new dry batteries AAA.LR03 (alkaline). |
| Other electric devices start operating. | If the remote controller activates other electric devices, move them away or consult your dealer. |
| Air has an odor | |
| The air conditioner gives off an odor. | The room odor absorbed in the unit is discharged with the airflow. We recommend you to have the indoor unit cleaned. Please consult your dealer. |
| Others | |
| The air conditioner suddenly starts behaving strangely during operation. | The air conditioner may malfunction due to lightning or radio. If the air conditioner malfunctions, turn off the power with the circuit breaker and restart the operation with the remote controller. |
Daikin FTXS50BVMA air troubleshooting
| Case | Explanation |
| Operation does not start soon. • When ON/OFF button was pressed soon after operation was stopped. • When the mode was reselected. |
This is to protect the air conditioner. You should wait for about 3 minutes. |
| Hot air does not flow out soon after the start of heating operation. | The air conditioner is warming up. You should wait for 1 to 4 minutes. (The system is designed to start discharging air only after it has reached a certain temperature.) |
| The heating operation stops suddenly and a flowing sound is heard. | The system is taking away the frost on the outdoor unit. You should wait for about 4 to 12 minutes. |
| The outdoor unit emits water or steam. | In HEAT mode • The frost on the outdoor unit melts into water or steam when the air conditioner is in defrost operation. • In COOL or DRY mode • Moisture in the air condenses into water on the cool surface of outdoor unit piping and drips. |
| Mists come out of the indoor unit. | This happens when the air in the room is cooled into mist by the cold air flow during cooling operation. |
| The indoor unit gives out odour. | This happens when smells of the room, furniture, or cigarettes are absorbed into the unit and discharged with the air flow. (If this happens, we recommend you to have the indoor unit washed by a technician. Consult the service shop where you bought the air conditioner.) |
| The outdoor fan rotates while the air conditioner is not in operation. | After operation is stopped: • The outdoor fan continues rotating for another 60 seconds for system protection. • While the air conditioner is not in operation: • When the outdoor temperature is very high, the out door fan starts rotating for system protection. |
| The operation stopped suddenly. (OPERATION lamp is on) | For system protection, the air conditioner may stop operating on a sudden large voltage fluctuation. It automatically resumes operation in about 3 minutes. |
| The air conditioner does not operate. (OPERATION lamp is off) | • Hasn’t a breaker turned OFF or a fuse blown? • Isn’t it a power failure? • Are batteries set in the remote controller? • Is the timer setting correct? |
| Cooling (Heating) effect is poor. | • Are the air filters clean? • Is there anything to block the air inlet or the outlet of the indoor and the outdoor units? • Is the temperature setting appropriate? • Are the windows and doors closed? • Are the air flow rate and the air direction set appropriately? |
| Operation stops suddenly. (OPERATION lamp blinks.) | • Are the air filters clean? • Is there anything to block the air inlet or the outlet of the indoor and the outdoor units? Clean the air filters or take all obstacles away and turn the breaker OFF Then turn it ON again and try operating the air conditioner with the remote controller. If the lamp still blinks, call the service shop where you bought the air conditioner. |
| An abnormal functioning happens during operation. | • The air conditioner may malfunction with lightening or radio waves. Turn the breaker OFF, turn it ON again and try operating the air conditioner with the remote controller. |