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Inspection and trial operation
Measure to take when E503 error occurs
Perform Trial Operation (cooling/heating)
- See the instructions on Key operation modes.
Perform Auto Trial Operation again
Yes
Yes
Yes
Yes
Yes
Take corrective measures.
No.
Is the ball valve on the outdoor unit
opened?
Take corrective measures.
No.
Has the correct amount of additional
refrigerant been injected into the indoor unit
and liquid line?
Take corrective measures.
No.
Are the 4-way valve, Main EEV and
pressure sensors operating properly?
Take corrective measures.
No.
Is the operation cycle normal?
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