Daikin MKS-T Series, Руководство по обслуживанию, Страница: 123 / 224

SiSG121917E Troubleshooting for Wall Mounted and LSP Duct Type Indoor Unit
Part 6 Service Diagnosis 118
Reference
5.2 Freeze-up Protection Control
Error Code
A5
Method of Error
Detection
During cooling operation, the freeze-up protection control (operation halt) is activated according
to the temperature detected by the indoor heat exchanger thermistor.
Error Decision
Conditions
During cooling operation, the indoor heat exchanger temperature is below 0°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.169
NO
NO
NO
Check No. 01
Check the indoor heat exchanger
thermistor.
YES
YES
(R20789)
YES
YES
NO
Caution
Provide sufficient air passage.
Clean the air filter.
Clean the indoor heat
exchanger.
Replace the indoor unit PCB
(control PCB).
Replace the indoor heat
exchanger 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.