Toshiba MMD-AP0076BHP1-E Service Manual page 76

Check code
Outdoor 7-segment display
Main
remote
Check
controller Sub-code
code
Detected indoor
address
L30 L30
L31
P01
P03 P03
01: Compressor
1 side
02: Compressor
2 side
03: Compressor
3 side
P04 P04
Location
Description System status
of
detection
Indoor External Stop of
unit interlock of corresponding
indoor unit unit
I/F Extended IC Continued
error operation
Indoor Indoor fan motor Stop of
unit error corresponding
unit
I/F Discharge All stop
temperature
TD1 error
IPDU Activation of All stop
high-pressure
SW
– –
76
Error detection
Check items (locations)
condition(s)
Signal is present at When external device is
external error input connected to CN80
terminal (CN80) for 1 connector:
minute. 1) Check for defect in
external device.
2) Check for defect in indoor
P.C. board.
When external device is not
connected to CN80
connector:
1) Check for defect in indoor
P.C. board.
There is part failure in P.C. Check outdoor P.C. board
board (I/F). (I/F).
Check the lock of fan motor
(AC fan).
Check wiring.
Discharge temperature (TD1) Check outdoor service
exceeds 115 "C. valves (gas side, liquid
side) to confirm full
opening.
Check outdoor PMVs
(PMV1, 2, 4) for clogging.
Check resistance
characteristics of TD1
sensor.
Check for insufficiency in
refrigerant quantity.
Check for defect in 4-way
valve.
Check for leakage of SV4
circuit.
Check SV4 circuit (wiring
or installation error in
SV41, SV42 or SV43).
High-pressure SW is Check connection of high-
activated. pressure SW connector.
Check for defect in Pd
pressure sensor.
Check outdoor service
valves (gas side, liquid
side) to confirm full
opening.
Check for defect in outdoor
fan.
Check for defect in outdoor
fan motor.
Check outdoor PMVs
(PMV1, 2) for clogging.
Check indoor / outdoor
heat exchangers for
clogging.
Check for short-circuiting
of outdoor suction /
discharge air flows.
Check SV2 circuit for
clogging.
Check for defect in outdoor
P.C. board (I/F).
Check for error in indoor
fan system (possible cause
of air flow reduction).
Check opening status of
indoor PMV.
Check indoor-outdoor
communication line for
wiring error.
Check for faulty operation
of check valve in discharge
pipe convergent section.
Check gas balancing SV4
valve circuit.
Check SV5 valve circuit.
Check for refrigerant
overcharging.