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Diagnostic procedure for check code
Check code
[09]
No temperature change in TC temperature
Is the power supply
voltage to the outdoor
unit normal?
Yes
Is the compressor
running but not
pumping?
Yes
Are the gas suction,
gas discharge and
liquid packed valves
fully open?
Yes
Is the wiring of the
compressor normal?
Yes
See judgement flow [1d]
compressor fault
Troubleshooting
Operation cause
1. Compressor running but not pumping.
2. Bi-Metal thermostat protection device.
3. Compressor wiring.
4. Faulty TC temperature sensor.
No
Modify power supply
No
No
Open packed valves
No
Modify connection of
wiring
Is the indoor unit in
No
frost conditions?
Yes
Is the indoor TC sensor
No
normal and connected
correctly?
Yes
Confirm:
Lack of gas charge
Pipe blockage
See judgement flow
[1d] compressor fault
Replace TC sensor
39
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