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Discharge temperature TD2 alarm
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 cooling bypass
PMV B normal?
Are the resistance characteristics
of TD2 sensor normal?
Is the wiring correct?
14
Insufficient refrigerant,
blockage, pipe breakage.
Troubleshooting
Diagnostic Procedure for Check Code
Check code
[bb]
No
Yes
Yes
No
No
Yes
No
Yes
No
Yes
(Check miswiring of the outdoor unit according to miswiring check function.)
Operation cause
1. Outdoor unit service valve closed
2. Cooling bypass PMV error
3. TD sensor error
4. Insufficient refrigerant, blockage in pipe
5. Blockage of PMV assembly on the liquid line
82
Open valves fully.
Replace both the PMVs.
Cooling bypass PMV B error
Replace TD2 sensor.
Set normal wiring.
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