Toshiba MMW-UP0271LQ-E Service Manual page 66

Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
P20 P20 —
1∗: Fan P.C.
board 1
2∗: Fan P.C.
P22 P22 board 2
1∗: Compressor
1 side
2∗: Compressor
2 side
P26 P26
1∗: Compressor
1 side
2∗: Compressor
P29 P29
2 side
P31 — —
Location
Description
of
detection
I/F Activation of
high-pressure
protection
Fan INV. Outdoor fan
P.C. board P.C. board
trouble
Compressor IPM,
P.C. board Compressor
shortcircuit
protection
trouble
Compressor Compressor
P.C. board position
detection circuit
trouble
Indoor unit Other indoor
trouble
(group follower
unit trouble)
Indoor unit (including Hot Water Module)
Check code detection
System status
condition(s)
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.
All stop Protected operation of Fan
inverter P.C. board
All stop Overcurrent is momentarily
detected during startup of
compressor.
All stop Position detection is not
going on normally.
Stop of There is trouble in other
corresponding indoor unit in group,
unit resulting in detection of
E07/L07/L03/L08.
– 66 –
Check items (locations)
• 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.
• 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.
• 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).
• Check wiring and
connector connection.
• Check for compressor
layer short-circuit.
• Check for failure in
compressor P.C. board.
• Check indoor P.C. board.