Wet Alarm - Daikin REYQ-XA Service Manual

Troubleshooting by Error Code

3.40 Wet Alarm

F4
Error Code
Applicable
All outdoor unit models
Models
Method of Error
In cooling operation, detect the condition under which liquid refrigerant returns to the compressor,
Detection according to the temperature and pressure of each part.
Error Decision When the following wet state continues for a period of 90 minutes, an alert is issued.
Conditions An error is defined for 120 minutes.
When the following wet state continues for a period of 45 minutes, an alert is issued.
Supposed
Causes
307
Wet state in outdoor units
Wet state in some of indoor units
Defective suction pipe thermistor
Defective compressor suction thermistor
Defective discharge pipe thermistor
Defective high pressure sensor
Defective indoor unit electronic expansion valve
Dirty air filter
SiUS371901E
Service Diagnosis