Samsung AM***XMDCH Series Installation Manual page 48

Inspection and check operation
Measure to take when E503 error occurs
Is the service valve of the outdoor unit
Is 4way valve and main EEV operating
Is the quantity of the refrigerant
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
❋ Symptoms for abnormal operation of the 4way valve
- Refrigerant noise is increased while compressor operates and suction temperature remains over 68 °F (20 °C)
compared to low pressure's saturation temperature.
- Temperature of Eva. in/out remains below 32 °F (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 32°F
(0°C)] and discharge temperature of the compressor will be low. (DSH is below 50 °F (10 °C))
: If there's operation error while the EEV is fully closed, low pressure will decrease and suction superheat will
increase excessively.
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.
Caution
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 defrost operation, it may be
hard to detect problem normally. In this case, run heating trial operation for more than 1 hour.
If the operation range is not within guaranteed range, error may occur even though the product is
normal.
48
opened?
Yes
normally?
Yes
appropriate?
Yes
No.
Open the service valve of the outdoor unit
No.
Check the 4way valve and Main EEV
No.
Check for leakage. Perform vacuuming and
charge refrigerant