103
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Are the gas pipe and liquid pipe
service valves of the outdoor unit
fully open ?
Is there a blockage in the PMV
assembly on the liquid line ?
Is the wiring correct ?
Insufficient refrigerant, blockage,
pipe breakage.
Open valves fully.
Replace both the PMVs.
Set normal wiring.
No
No
Yes
Yes
Yes
No
Are the resistance characteristics
of TD2 sensor normal ?
Replace TD2 sensor.
No
Yes
Is the cooling bypass
PMV B normal ?
Cooling bypass PMV B error
No
Yes
(Check miswiring of the outdoor unit according to miswiring check function.)
Troubleshooting
Diagnostic procedure for check code
Check code Operation cause
[bb] 1. Outdoor unit service valve closed
Discharge temperature (TD2) alarm 2. Cooling bypass PMV error
3. TD sensor error
4. Insufficient refrigerant, blockage in pipe
5. Blockage of PMV assembly on the liquid line
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