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Troubleshooting
Diagnostic procedure for check code
Check code Operation cause
[A7] 1. Outdoor unit service valve closed
Suction temperature (TS) alarm 2. Blockage PMV assembly on the liquid line
3. TS sensor error
4. Insufficient refrigerant, blockage in pipe
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 ?
Open valves fully.
Replace both the PMVs.
No
Yes
Yes
No
Insufficient refrigerant, blockage,
pipe breakage.
Are the resistance
characteristics of TS sensor
normal ?
Replace TS sensor.
No
Yes
Check code Operation cause
[AA]
High pressure sensor (Pd) short circuit Pd sensor output voltage alarm
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 PC board.
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