[E6] Fixed-Speed (1) Iol, Ocr Alarm; [F1] Fixed-Speed (2) Iol, Ocr Alarm - Toshiba HFCR407C Service Manual

Diagnostic procedure for check code
Check code
[E6]
Fixed-speed (1) IOL, OCR alarm
[F1]
Fixed-speed (2) IOL, OCR alarm
Does OCR operate ?
Check the OCR reset button.
(Manual reset)
No
Is OCR circuit normal ?
1. OCR unit
2. OCR wiring
Yes
Are gas pipe, liquid pipe, and
service valve of the outdoor
unit fully open ?
Yes
Is the cooling bypass
PMV B normal ?
Yes
Cooling bypass PMV B error
Is IOL circuit normal ?
1. Connector
2. Wiring
3. Outdoor PC board
Yes
Is wiring normal ?
Yes
Insufficient refrigerant, blockage,
pipe breakage.
Troubleshooting
Operation cause
1. Power supply error
2. Fixed-speed compressor IOL operation
3. Service valve closed
4. Blockage in indoor/outdoor PMV
5. Miswiring of communication between indoor and
outdoor units
Yes
No
Repair OCR circuit.
No
Open valves fully.
No
No
No
(Check miswiring of the outdoor unit according to miswiring check function.)
119
[E6]: IOL operation circuit error compressor 1 side
[F1]: IOL operation circuit error compressor 2 side
Check the following:
1. Power supply voltage is
380/400/415V
2. Phase missing, short-
circuit of fixed-speed
compressor power
supply
Yes
Is Mg-SW faulty ?
No
Is constant speed
compressor normal ?
1. Is compressor winding
normal ?
2. Is compressor locked ?
Yes
Overload operation,
liquid compression
No
Repair power supply.
Yes
Replace Mg-SW.
No
Replace fixed-speed
compressor.
Repair IOL circuit.
Correct wiring.
14