Toshiba MMU-P0121H Service Manual page 57

Check Detected Check
code position code name
E5 Interface Inverter
IOL
operation
E6 Interface Fixed-
speed side
IOL, OL
system
alarm (1)
Eb Interface Outside
indoor
alarm input
Cause
Trouble detection condition
(Position)
Inverter IOL Inverter IOL or high pressure
system SW operated.
circuit
n When high pressure
Pd ≥ 2.5MPa,
[21] is displayed.
n When high pressure
Pd < 2.5MPa,
[E5] is displayed.
Fixed-speed Fixed-speed side IOL, OCR
side IOL, system or high pressure SW
OCR system operated.
circuit n When high pressure
Pd ≥ 2.5MPa,
(Compressor
1)
[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.
Outside • According to voltage input in
alarm input the outside input terminal of
signal [b6] is
indoor P.C. board
receiving
• The check code [b6] is
from indoor.
received from indoor unit.
• Check inverter high pressure SW error.
• Check inverter IOL operation and case
temp.
• Check overload operation cause and
refrigerant shortage.
• Check if service valve is fully open.
• Check indoor fan 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.
• Short-circuit status of outdoor discharge air
suction air
• 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.
• Check high pressure SW error of compressor
1, and check IOL, OCR operation.
• Check IOL operation of compressor 1 and
case temp. up.
(Check cause of overload operation.)
• Check operation and blockage of SV41 valve.
• Check if 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.
• When outside device is connected to
connector (CN17)
1) Check outside device error.
2) Check failure of indoor main P.C.
board (MCC-1361)
• When outside device is not connected to
connector (CN17)
1) Check indoor main P.C. board
(MCC-1361)
3-54
Check item (Position)