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Measure to take when E503 error occurs
Inspection & trial operation
Symptoms for abnormal operation of the 4way valve
- Refrigerant noise is increased while compressor operatres and suction temperature remains over 20°C compared to
low pressure's saturation temperature.
- Temperature of Eva. in/out remains below 0 °C during heating operation.
Symptoms for abnormal operation of the Main EEV
- Error on controlling degree of superheat of compressor inlet during heating operation.
: If there's operation error while the EEV is fully opened, suction superheat cannot be secured (below 0 °C) and
discharge temperature of the compressor will be low. (DSH is below 10°C)
: If there's operation error while the EEV is fully closed, low pressure will decrease and suction superheat will increase
excessively.
1. Run trial operation mode for more than 30 minutes
2. Run Fan mode for more than 10 minutes
3. Restart the auto trial operation
Yes
Yes
Yes
Open the service valve of the outdoor unit
No.
Is the service valve of the outdoor unit
opened?
Check the 4way valve and Main EEV
No.
Is 4way valve and main EEV operating
normally?
Check for leakage. Perform vacuuming and
charge refrigerant
No.
Is the quantity of the refrigerant
appropriate?
• If the service valve need to be detected, auto detection mode will end. Check both gas pipe and liquid
pipe service valves when detecting service valve.
• When 4way valve, Main EEV detection is needed, run heating trial operation for more than 1 hour and
analyze the data to check for a problem.
• If there's frost formed in outdoor unit or the outdoor unit is operating in deforst operation, it may be hard
to detect problem normally. In this case, run heating trial operation for more than 1 hour.
• If the opreation range is not within guaranteed range, error may occur even though the product is normal.
Caution
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