Toshiba MMW-UP0271LQ-E - Page 66

– 66 –
Check code
Location
of
detection
Description System status
Check code detection
condition(s)
Check items (locations)
• Check connector
connection and wiring on
compressor P.C. board.
• Check for failure in
compressor (layer
shortcircuit).
• Check for failure in outdoor
P.C. board ( Compressor).
IPM,
Compressor
shortcircuit
protection
trouble
Compressor
P.C. board
1∗: Compressor
1 side
2∗: Compressor
2 side
All stop Overcurrent is momentarily
detected during startup of
compressor.
P26 P26
Main
remote
controller
Outdoor 7-segment display
Check
code
Sub-code
• Check wiring and
connector connection.
• Check for compressor
layer short-circuit.
• Check for failure in
compressor P.C. board.
Compressor
position
detection circuit
trouble
Compressor
P.C. board
1∗: Compressor
1 side
2∗: Compressor
2 side
All stop Position detection is not
going on normally.
P29 P29
• Check indoor P.C. board.Other indoor
trouble
(group follower
unit trouble)
Indoor unit Stop of
corresponding
unit
There is trouble in other
indoor unit in group,
resulting in detection of
E07/L07/L03/L08.
P31 — —
• Check fan motor.
• Check for failure in fan
P.C. board.
• Check connection of fan
motor connector.
• Check power voltage of
the main power supply.
Outdoor fan
P.C. board
trouble
Fan INV.
P.C. board
1∗: Fan P.C.
board 1
2∗: Fan P.C.
board 2
All stop Protected operation of Fan
inverter P.C. board
P22 P22
• Check for failure in Pd
pressure sensor.
• Check service valves (gas
side, liquid side) to confirm
full opening.
• Check for failure in outdoor
fan.
• Check for failure in outdoor
fan motor.
• Check outdoor PMV
(PMV1, 2, 3, 4) for
clogging.
• Check indoor/outdoor heat
exchangers for clogging.
• Check for short-circuiting
of outdoor suction/
discharge air flows.
• Check for failure in outdoor
P.C. board (I/F).
• Check for failure in indoor
fan system (possible cause
of air flow reduction).
• Check opening status of
indoor PMV.
• Check indoor-outdoor
communication line for
wiring trouble.
• Check for troble operation
of check valve in discharge
pipe convergent section.
• Check gas balancing SV4
valve circuit.
• Check for refrigerant
overcharging.
Activation of
high-pressure
protection
I/F All stop <During cooling operation>
Pd sensor detects pressure
equal to or greater than
3.85 MPa.
<During heating operation>
Pd sensor detects pressure
equal to or greater than
3.6 MPa.
P20 P20 —
Indoor unit (including Hot Water Module)