Operation Shutdown Due To High-Pressure Control Or Freeze-Up Protection (Thermistor Activation) - Daikin FTK25JV1NB Manual

Si-86.book Page 60 Friday, June 23, 2000 10:26 AM
Troubleshooting
5.4 Operation Shutdown Due to High-Pressure Control or Freeze-Up Protection
(Thermistor Activation) (A5)
A A A A 5 5 5 5
Remote Controller
Display
Indoor unit LED
Display
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed Causes
Troubleshooting
60
High pressure control
During heating operations, the temperature detected by the indoor heat exchanger thermistor is used
for the high pressure control (stop, outdoor fan stop, etc.)
The freeze protection control (operation halt) is activated during cooling operation according to the
temperature detected by the indoor unit heat exchanger thermistor.
High pressure control
During heating operations, the temperature detected by the indoor heat exchanger thermistor is above
67˚C
Freeze protection
When the indoor unit heat exchanger temperature is below 0˚C during cooling operation.
Operation halt due to clogged air filter of the indoor unit.
Operation halt due to dust accumulation on the indoor unit heat exchanger.
Operation halt due to short-circuit.
Detection error due to faulty indoor unit heat exchanger thermistor.
Detection error due to faulty indoor unit PCB.
Check the air passage.
YES
Is there any short-circuit?
NO
Check the intake air filter.
YES
Is it very dirty?
NO
Check the dust accumulation on
the indoor unit heat exchanger.
YES
Is it very dirty?
NO
Check No. 5
Indoor unit heat exchanger
thermistor check
YES
Does it conform to the
thermistor characteristic
chart?
NO
SIE-86
Provide sufficient air passage.
Clean the air filter.
Clean the heat exchanger.
Replace the indoor unit PCB.
Replace the thermistor (replace
the indoor unit PCB).
(RF002)
Service Diagnosis