ENGLISH-112
Inspection and test operation
Measures to take when an E503 error occurs (When the “inspection required” message appears on
the S-NET pro report)
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
open?
Check the 4 way valve and Main EEV
No.
Is 4 way valve and main EEV operating
normally?
Check for leakage. Perform vacuuming and
charge refrigerant
No.
Is the quantity of the refrigerant correct?
❋
4 way valve abnormal operation symptoms:
- Refrigerant noise increases when the compressor is in operation and the inlet pipe temperature (H/P: Suction, H/R:
Suction 2) remains over 10 °C (50 °F) when compared to the low pressure saturation temperature.
- During heating operation, the temperature of the EVa. in/out maintains a value of less than 0 °C (32 °F).
❋
Main EEV abnormal operation symptoms:
- During heating operation, an error occurs when controlling the degree of the superheat on the compressor inlet.
: If there is an operation error whilst the EEV is fully open, the target degree of superheat [1 °C (33.8 °F)] cannot be
achieved [below 0 °C (32 °F) and the discharge temperature of the compressor is low.
: If there is and operation error whilst the EEV is fully closed, the low pressure will decrease and the degree of
superheat on the compressor inlet increases excessively.
t
If the service valve needs to be detected, corresponding outdoor unit will display the error.
t
If the service valve needs to be detected, auto detection mode will end. Check both gas pipe and liquid pipe
service valves when detecting service valve.
t
When 4 way valve, Main EEV detection is needed, run heating trial operation for more than 1 hour and analyze
the data to check for a problem.
t
If the operation range is not within guaranteed range, error may occur even though the product is normal.
CAUTION
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