How to solve error code F4 | Wet Alarm | Daikin VRV4
Brand : Daikin
model : RXQ8AYM (CU)
model : FXMQ140PAVE (FCU)
Symptoms : Blinking and error F4
Cause : One of the indoor unit gas temperature thermistor reading abnormal.
Action : Check CU error and indoor error using wire remote control.
Check thermistor reading.
Replace indoor gas temperature thermistor R3T.
Test run .
Method Of Error Detection
In cooling operation, detect the condition under which liquid refrigerant returns to the compressor, according to the temperature and pressure of each part.
Error Decision Conditions
When the following wet state continues for a period of 90 minutes, an alert is issued. An error is defined for 120 minutes.
* Wet state in outdoor units.
When the following wet state continues for a period of 45 minutes, an alert is issued.
* Wet state in some indoor units.
Supposed Cause
* Defective suction pipe thermistor.
* Defective discharge pipe thermistor.
* Defective high pressure sensor.
* Defective indoor unit electronic expansion valve.
* Dirty air filter.
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