Toshiba MMU-UP0051MH-E(TR) Service Manual page 115

Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
1∗: Fan P.C.
board 1
P22 P22
2∗: Fan P.C.
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
Fan INV. Outdoor fan All stop
P.C. board P.C. board
trouble
Compressor IPM, All stop
P.C. board Compressor
shortcircuit
protection
trouble
Compressor Compressor All stop
P.C. board position
detection circuit
trouble
Indoor unit Other indoor Stop of
trouble corresponding
(group follower unit
unit trouble)
– 115 –
Check code detection
System status
condition(s)
Protected operation of Fan
inverter P.C. board
Overcurrent is momentarily
detected during startup of
compressor.
Position detection is not
going on normally.
There is trouble in other
indoor unit in group,
resulting in detection of
E07/L07/L03/L08.
Check items (locations)
• 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.