Daikin FLKS25BAVMB - 3.13 Four Way Valve Abnormality

Troubleshooting SiENBE05-722_A
70 Service Diagnosis
3.3 Freeze-up Protection Control or Heating Peak-cut
Control
Remote Control
Display
A5
Method of
Malfunction
Detection
 Freeze-up protection control
During cooling operation, the freeze-up protection control (operation halt) is activated
according to the temperature detected by the indoor heat exchanger thermistor.
 Heating peak-cut control
During heating operation, the temperature detected by the indoor heat exchanger thermistor
is used for the heating peak-cut control (operation halt, outdoor fan stop, etc.)
Malfunction
Decision
Conditions
 Freeze-up protection control
During cooling operation, the indoor heat exchanger temperature is below 0°C.
 Heating peak-cut control
During heating operation, the indoor heat exchanger temperature is above 65°C
Supposed
Causes
 Short-circuited air
 Clogged air filter of the indoor unit
 Dust accumulation on the indoor heat exchanger
 Defective indoor heat exchanger thermistor
 Defective indoor unit PCB
SiENBE05-722_A.pdf 79 24/02/2011 14:05:57