Samsung AM JXVAF Series Installation Manual page 90

Inspection and trial operation
Measure to take when E503 error occurs (When "inspection required" sign is appeared on result
report of S-NET pro)
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 temperature of the pipe inlet (H/P: Suction, H/R: Suction
2) remains over 10 °C (50 °F) compared to low pressure's saturation temperature.
- Temperature of Eva. in/out remains below 0 °C (32 °F) 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, targeted degree of superheat [1 °C (33.8 °F)] cannot be secured
[below 0 °C (32 °F)] and discharge temperature of the compressor will be low.
: If there's operation error while the EEV is fully closed, low pressure will decrease and the degree of superheat on the
compressor inlet will increase excessively.
If the service valve need to be detected, corresponding outdoor unit will display the error.
If the service valve need to be detected, auto detection mode will end. Check both gas pipe and liquid pipe
CAUTION
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.
90
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