Daikin FTXN50L - A5: Antifreeze;High Pressure Control

Service Diagnosis
38
A5
Description
ANTIFREEZE PROTECTION OR HIGH PRESSURE CONTROL
Possible Root
cause
1. Indoorairlter,heatexchangerblockduetodustaccumulation.
2. Indoor air short circuit.
3. Indoor coil thermistor faulty.
4. Indoor PCB faulty.
5. Fan blower dirty.
Troubleshooting
Any air short
circuit?
Does it conform
to the thermistor
resistance table?
Yes
No
Check indoor air flow.
Check intake air filter.
Check fan blower condition.
Change indoor thermistor.
Check the dust
accumulate indoor coil.
No
Yes
Change indoor PCB.
Provide sufficient air passage.
Is it very dirty?
Yes
No
Clean the air filter.
Check indoor coil
thermistor resistance.
Is it very dirty?
Yes
# Refer to thermistor resistance table.(Page 72, 6.1)
No
Clean fan blower.
Is it very dirty?
Yes
No
Clean the indoor coil.