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TS condition gas leak detection
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
Are the resistance characteristics
of TS sensor normal?
Insufficient refrigerant,
blockage, pipe breakage.
14
If there is an abnormal output voltage of Pd sensor: Check connector circuit
(Pd sensor: CN501) and output voltage of the sensor.
If the sensor is normal, replace the outdoor interface P .C. board.
Troubleshooting
Diagnostic Procedure for Check Code
Check code
[A7]
No
Yes
Yes
liquid line?
No
No
Yes
Check code
[AA]
Pd sensor alarm
Operation cause
1. Outdoor unit service valve closed
2. Blockage PMV assembly on the liquid line
3. TS sensor error
4. Insufficient refrigerant, blockage in pipe
Operation cause
Pd sensor output voltage alarm
78
Open valves fully.
Replace both the PMVs.
Replace TS sensor.
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