Heater Wire Abnormality - Daikin CTXU25G2V1B Service Manual

Troubleshooting
2.36

Heater Wire Abnormality

PA
Remote
Controller Display
Outdoor Unit LED A5
Display
Method of A fault is identified when the outlet temperature of humidification fan does not reach a certain
temperature within a given time after the heater turned on.
Malfunction
Detection
Malfunction When the temperature detected by the thermistor is lower than the outdoor temperature (at
heater turned off) + 5°C, and this condition continues for 30 min.
Decision
Conditions
Supposed
Causes
156
55
Breakage of heater filament
Breakage of heater harness
Abnormal temperature detected by outdoor temperature thermistor
Abnormal temperature detected by humidification fan outlet thermistor
Damaged main relay
Blown thermal fuse
Damaged heater control part
Extremely low voltage
SiBE12-908
Service Diagnosis