Cooling / Heating Operation Starts But Stops Immediately - Daikin RZQ Series FCQ20EVA Service Manual

Symptom-based Troubleshooting
2.4

Cooling / Heating Operation Starts but Stops Immediately

Applicable Model All models of TopAir series
 Overcharge of refrigerant
Supposed
 Air mixed in refrigerant system
Causes
 Defective pressure switch
 Defective magnetic switch for outdoor unit fan motor
 Defective aux. relay for outdoor unit fan motor
 Soiled heat exchanger of outdoor unit
 There is an interfering item in airflow of outdoor unit
 Defective outdoor unit fan
 Soiled air filter of indoor unit
 Soiled heat exchanger of indoor unit
 There is some interfering item in airflow of indoor unit
 Defective indoor unit fan
Troubleshooting
Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Is the type of
remote controller wired or
wireless?
Wireless
Is the
operation lamp of indoor unit
receiver blinking?
Heating: Indoor
NO
unit
Cooling: Outdoor
unit
Does the fan rotate?
YES
Is the filter soiled?
NO
Is there any interfering
item in airflow?
NO
Is the heat exchanger
soiled?
NO
Possible causes as follows:
∗ Refrigerant overcharge
∗ Mixing of air in refrigerant system
∗ Defective pressure switch
77
Is the operation
wired
lamp of remote controller
blinking?
NO
YES
NO
YES
YES
YES
YES
Diagnose based on the error
code on remote controller
Defective fan motor. Check the
magnetic switch and aux. relay
for fan motor.
Cleaning
Remove the interfering item.
Cleaning of the heat exchanger
After vacuum drying, charge
correct amount of refrigerant.
Check the pressure switch.
SiME281501E
Service Diagnosis