Service manual

104
14
Troubleshooting
Diagnostic Procedure for Check Code
Check code Operation cause
[E6] 1. Power supply error
Fixed-speed IOL, 2. Fixed-speed compressor IOL operation
OL system alarm (1) 3. Service valve closed
[F1] 4. Blockage in indoor/outdoor PMV
Fixed-speed IOL, 5. Miswiring of communication between indoor and
OL system alarm (2) outdoor units
Does OCR operate?
Check the OCR reset button.
(Manual reset)
Is constant speed
compressor normal?
1.Is compressor winding
normal?
2.Is compressor locked?
Is OCR circuit normal?
1.OCR unit
2.OCR wiring
Repair power supply.
Open valves fully.
Repair OCR circuit.
Replace Mg-SW.
Replace fixed-speed
compressor.
Overload operation,
liquid compression
Check the following:
1. Power supply voltage
is 380/400/415V
2. Phase missing, short-
circuit of fixed-speed
compressor power
supply
Yes
No
No
Yes
No
Yes
Yes
No
Is Mg-SW faulty?
[E6]: IOL operation circuit error compressor 1 side
[F1]: IOL operation circuit error compressor 2 side
Yes
No
Yes
Is IOL circuit normal?
1.Connector
2.Wiring
3.Outdoor P.C. board
Is the cooling bypass
PMV B normal?
Is wiring normal?
Repair IOL circuit.
Cooling bypass PMV B error
Correct wiring.
No
Yes
Are gas pipe, liquid pipe,
and service valve of the
outdoor unit fully open?
No
No
Yes
No
Yes
Insufficient refrigerant,
blockage, pipe breakage.
(Check miswiring of the outdoor unit according to miswiring check function.)