Freeze-Up Protection Control / Heating Peak-Cut Control - Daikin FTX20K(2)V1B Service Manual

Troubleshooting
4.3

Freeze-up Protection Control / Heating Peak-cut Control

A5
Error Code
 Freeze-up protection control
Method of Error
Detection
 Heating peak-cut control
 Freeze-up protection control
Error Decision
Conditions
 Heating peak-cut control
 Short-circuited air
Supposed
 Clogged air filter of the indoor unit
Causes
 Dust accumulation on the indoor heat exchanger
 Defective indoor heat exchanger thermistor
 Defective indoor unit PCB
Troubleshooting
Check No.01
Refer to P.79
51
During cooling operation, the freeze-up protection control (operation halt) is activated
according to the temperature detected by the indoor heat exchanger thermistor.
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.)
During cooling operation, the indoor heat exchanger temperature is below 0°C.
During heating operation, the indoor heat exchanger temperature is above about 60°C.
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Check the air passage.
Is there any short circuit?
NO
Check the air filter.
Dirty?
NO
Check the dust accumulation on
the indoor heat exchanger.
Dirty?
NO
Check No. 01
Check the indoor heat exchanger
thermistor.
As
described in the
thermistor characteristic
chart?
YES
YES
YES
YES
NO
SiBE041525F
Provide sufficient air passage.
Clean the air filter.
Clean the indoor heat
exchanger.
Replace the indoor heat
exchanger thermistor.
Replace the indoor unit PCB
(control PCB).
(R21064)
Service Diagnosis