Toshiba MMW-UP0271LQ-E - Diagnostic Procedure for each Check Code (Hot Water Module)

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Check code Check code name
[A01]
Flow switch operation
(M-HWM)
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
Cause
(Check there is no clogging in water pipe.)
Check and correct
wiring.
Dose flow SW
operate ?
Is circuit wiring
normal ?
Check M-HWM
control P.C. board.
YES
ONON
Are parts of flow SW
normal ?
Check parts.
NO
YES
Dose water pump
operate ?
Check and correct
wiring.
Is circuit wiring
normal ?
YES
NO
NO
Water pipe clogging.
Replace M-HWM
I/F P.C. board.
Is M-HWM I/F P.C.
board normal ?
Check water pump
Failure → replace
YES
YES
YES
NO
9-5. Diagnostic Procedure for Each Check Code (Hot water module)