Diagnostic Procedure For Each Check Code (Hot Water Module) - Toshiba MMW-UP0271LQ-E Service Manual

9-5. Diagnostic Procedure for Each Check Code (Hot water module)

Check code Check code name
Flow switch operation
(M-HWM)
[A01]
Dose flow SW
operate ?
YES
Are parts of flow SW
normal ?
YES
Dose water pump
operate ?
YES
Flow switch trouble
Water pump trouble
Clogging of water pipe
M-HWM control P.C. board trouble
M-HWM I/F P.C. board trouble
N O
Is circuit wiring
normal ?
NO
NO
Is circuit wiring
normal ?
Is M-HWM I/F P.C.
board normal ?
– 68 –
Cause
N O
YES
NO
YES
NO
YES
(Check there is no clogging in water pipe.)
Check and correct
wiring.
Check M-HWM
control P.C. board.
Check parts.
Check and correct
wiring.
Replace M-HWM
I/F P.C. board.
Check water pump
Failure → replace
Water pipe clogging.