Toshiba MM-A0280HT Service Manual page 97

OL system alarm (1)
OL system alarm (2)
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 the cooling bypass
14
PMV B normal?
Is IOL circuit normal?
1.Connector
2.Wiring
3.Outdoor P .C. board
Is wiring normal?
Insufficient refrigerant,
blockage, pipe breakage.
Troubleshooting
Diagnostic Procedure for Check Code
Check code
[E6]
Fixed-speed IOL,
[F1]
Fixed-speed IOL,
Yes
No
No
Yes
Repair OCR circuit.
No
Yes
Open valves fully.
No
Yes
Cooling bypass PMV B error
No
Yes
No
Yes
(Check miswiring of the outdoor unit according to miswiring check function.)
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
[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
98
No
Repair power supply.
Yes
Replace Mg-SW.
No
Replace fixed-speed
compressor.
Repair IOL circuit.
Correct wiring.