143
Yes
E3
Low Pressure Protection
Status:
Cooling operation, compressor stops while
indoor fans runs. Heating operation, complete
unit stops
1. Low refrigerant charge
2. Improper indoor mode setting
3. Improper fan operation
4.
Refrigerant valve not fully opened
Error Code Diagnostics
E3 Error Codes
Compressor Low Pressure Protection
Fault & Status
Possible Causes
Refer to high pressure protection
Charge refrigerant according to the amount
specified in the nameplate and calculated
additional amount
Completely open all valves
Close the panel
Remove the barrier
Measure the fan motor input
Measure swing motor signal input
Refer to care and maintenance
Check inlet and outlet of main pipes
connecting each indoor unit and capillary of
indoor and outdoor units. Replace the parts
such as filter, etc as needed.
Low Pressure Protection
Verify low pressure with gauge
Check if the refrigerant is sufficient
Check if gas and liquid valves are open
Check if panel of outdoor unit is firmly closed
Check air flow of indoor and outdoor units for
obstructions
Check for indoor and outdoor fan operation
Check operation of swing louver
Check indoor filter and coils for dirt
System piping is blocked
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
Yes
Refer to instruction manual of
indoor unit
Check if operation mode of indoor unit is set
properly
No
Yes
