Toshiba HFC R407C - Page 59

59
Troubleshooting
Diagnostic procedure for check code
Check code Operation cause
[E6] 1. Power supply error.
Fixed-speed IOL, OL alarm 2. Fixed-speed compressor IOL operation.
3. Service valve closed.
4. Blockage in Multi Controller PMV/outdoor PMV 1.
5. Miswiring of communication between indoor and outdoor units.
OCR: Overload Current Relay
Does OCR operate ?
Check the OCR reset button.
(Manual reset)
Is OCR circuit normal ?
1. OCR unit
2. OCR wiring
Are gas pipe, liquid pipe, and
service valve of the outdoor
unit fully open ?
Is outdoor PMV 1
normal?
1. Connector connection
2. Wiring
3. Coil
4. Valve unit
5. Outdoor PC board
Is wiring normal ?
Insufficient refrigerant, blockage,
pipe breakage.
Repair OCR circuit.
Open service valves fully.
Repair power supply system.
Replace fixed-speed
compressor.
Repair IOL circuit.
Are the following items
related to power supply
normal?
1. Power supply voltage is
400 V ± 10%
2. Phase missing, short-
circuit of fixed-speed
compressor power supply
circuit system
Is Mg-SW defective?
Replace Mg-SW.
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No
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No
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No
No
No
Repair outdoor PMV.
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No
No
Is IOL circuit normal ?
1. Connector
2. Wiring
3. Outdoor PC board
Is constant speed
compressor normal ?
1. Is compressor winding
normal ?
2. Is compressor locked?
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Overload operation,
liquid compression
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Set normal wiring.
(Check miswiring of the outdoor unit according to miswiring check function.)
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(Check there is no blockage or pipe breakage.)