Toshiba MMU-P0121H Service Manual page 102

Check code
[E6]
Fixed-speed IOL, OL system alarm (1)
[F1]
Fixed-speed IOL, OL system alarm (2)
Does OCR operate?
Check with 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
Are outdoor PMV A
and PMV B normal?
1. Connector connection
2. Wiring 3. Coil
4. Valve unit
5. Outdoor P.C. board
YES
Is IOL circuit normal?
1. Connector
2. Wiring
3. Outdoor P.C. board
YES
Is wiring normal?
YES
Insufficient refrigerant,
blockage, pipe breakage
YES
NO
Repair OCR circuit.
NO
Open service valve fully.
NO
Repair outdoor PMV.
NO
NO
(Check miswiring of the outdoor unit according to miswiring check function.)
Check there is no blockage or pipe breakage, and then add
(
refrigerant according to judgment of refrigerant amount.
Operation cause
1. Power supply error
2. Fixed-speed compressor IOL operation
3. Service valve closed
4. Blockage in indoor PMV/outdoor PMV A, PMV B
5. Miswiring of communication between indoor and
outdoor unit
[E6] : IOL operation circuit error at compressor 1 side
[F1] : IOL operation circuit error at compressor 2 side
Are following items related
to power supply normal?
1. Power supply voltage is
380/400/415V ±10% (for 50Hz),
380V ±10% (for 60Hz)
2. Phase missing,short-circuit of
fixed-speed compressor
power supply circuit system
YES
Is Mg-SW defunct?
NO
Is constant speed compressor normal?
1. Is compressor winding normal?
2. Is compressor locked?
YES
Overload operation, liquid compression
3-99
NO
Repair power
supply system.
YES
(
Replace Mg-SW.
NO
Replace fixed-speed
compressor.
Repair IOL circuit.
Set normal wiring.
)