Toshiba MMU-P0121H Service Manual page 58

Check Detected Check code
code position name
F0 Interface Fixed-speed high
pressure SW
system alarm (2)
F1 Interface Fixed-speed side
IOL, OL system
alarm (2)
Cause Trouble detection
(Position) condition
Fixed-speed High pressure SW circuit or
high pressure IOL, OCR system circuit
SW system operated.
circuit
n When high pressure
(Compressor 2)
Pd ≥ 2.5MPa,
[High pressure SW
system error]
1) In case of compressor
1 : [E1] is displayed.
2) In case of compressor
2 : [F0] is displayed.
n When high pressure
Pd < 2.5MPa,
[IOL, OCR system error]
1) In case of compressor
1 : [E6] is displayed.
2) In case of compressor
2 : [F1] is displayed.
Fixed-speed Fixed-speed side IOL, OCR
side IOL, OCR system or high pressure SW
system circuit operated.
(Compressor 2)
n When high pressure
Pd ≥ 2.5MPa,
[High pressure SW
system error]
1) In case of compressor
1 : [E1] is displayed.
2) In case of compressor
2 : [F0] is displayed.
n When high pressure
Pd < 2.5MPa,
[IOL, OCR system error]
1) In case of compressor
1 : [E6] is displayed.
2) In case of compressor
2 : [F1] is displayed.
3-55
Check item (Position)
• Check high pressure SW error of
compressor 2, and check IOL, OCR
operation.
• Check IOL operation of compressor 2
and case temp.
(Check cause of overload operation.)
• Check operation and for blockage of
SV42 valve.
• Check service valve is fully open.
• Check outdoor fan operation and
connector connection.
• Check outdoor fan motor and running
capacitor error.
• Check for blockage of outdoor PMV.
1) Refrigerant choke circuit (PMV A)
2) Cooling bypass circuit (PMV B)
3) Liquid line check valve
(Cooling only model)
• Check for blockage of indoor/outdoor
heat exchanger.
• Check Pd pressure sensor error.
• Check for blockage of hot gas bypass.
SV2 circuit.
• Check outdoor P.C. board (interface)
error.
• Check indoor PMV opening pulse.
• Check miswiring between
indoor/outdoor communication line.
• Check high pressure SW error of
compressor 2, and check IOL, OCR
operation.
• Check IOL operation of compressor 2
and case temp.
(Check cause of overload operation.)
• Check operation and for blockage of
SV42 valve.
• Check service valve is fully open.
• Check outdoor fan operation and
connector connection.
• Check outdoor fan motor and running
capacitor error.
• Check for blockage of outdoor PMV.
1) Refrigerant choke circuit (PMV A)
2) Cooling bypass circuit (PMV B)
3) Liquid line check valve
(Cooling only model)
• Check for blockage of indoor/outdoor
heat exchanger.
• Check Pd pressure sensor error.
• Check for blockage of hot gas bypass
SV2 circuit.
• Check outdoor P.C. board (interface)
error.
• Check indoor fan error.
(Cause of air volume down)
• Check indoor PMV opening pulse.
• Check miswiring between
indoor/outdoor communication line.