Daikin Super Multi Plus E-Series CTXG50EV1BW - Freeze-Up Protection Control or Heating Peak-Cut Control

SiBE18-821_C Troubleshooting for RA Indoor Unit
Troubleshooting 353
4.2 Freeze-up Protection Control or Heating Peak-cut
Control
Remote
Controller
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 temperature detected by the indoor heat exchanger thermistor
is above 65°C.
Supposed
Causes

Clogged air filter of the indoor unit

Dust accumulation on the indoor heat exchanger

Short-circuited air

Defective indoor heat exchanger thermistor

Defective indoor unit PCB