Daikin Super multi NX E Series User Manual

SiBE121135_A Troubleshooting for RA Indoor Unit
Service Diagnosis 172
5.2 Freeze-up Protection Control or Heating Peak-cut
Control
Error Code A5
Method of Error
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 indoor heat exchanger temperature is used for the heating
peak-cut control (operation halt, outdoor fan stop, etc.)
Error 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
Troubleshooting
Check No.01
Refer to P.230
NO
NO
NO
Check No. 06
Check the indoor heat exchanger
thermistor.
YES
YES
(R7131)
YES
YES
NO
Caution
Provide sufficient air passage.
Clean the air filter.
Clean the indoor heat
exchanger.
Replace the indoor unit PCB.
Replace the thermistor.
Does it
conform to the
thermistor characteristic
chart?
Check the air filter.
Check the dust accumulation on
the indoor heat exchanger.
Is there any short circuit?
Is it very dirty?
Is it very dirty?
Check the air passage.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
NO
NO
NO
Check No. 01
Check the indoor heat exchanger
thermistor.
YES
YES
(R15715)
YES
YES
NO
Caution
Provide sufficient air passage.
Clean the air filter.
Clean the indoor heat
exchanger.
Replace the indoor unit PCB.
Replace the thermistor.
As described in the
thermistor characteristic
chart?
Check the air filter.
Check the dust accumulation on
the indoor heat exchanger.
Is there any short circuit?
Dirty?
Dirty?
Check the air passage.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.

Daikin Super multi NX E Series Specifications

General

Brand	Daikin
Model	Super multi NX E Series
Category	Air Conditioner
Language	English