Toshiba MMW-UP0271LQ-E - Page 69

– 69 –
Check code Check code name
[A02]
Water temperature decrease
trouble
(M-HWM)
Water heater trouble
M-HWM I/F P.C. board trouble
TWI (TA) sensor trouble
TWO (TC2) sensor trouble
Cause
Check and correct
Is the water
heater normal ?
Are characteristics of
TWI (TA) and TWO (TC2)
sensor resistance normal ?
Is the water
heater connected ?
Check setting of DN
code 61
Heater connection: 1
No heater connection: 0
NO
NO
NO
YES
Replace M-HWM I/F P.C.
board.
YES
Is the water heater
capacity selection correct ?
Select the correct
YES
NO
Are characteristics
of TWI (TA) and
TWO (TC2) sensor
resistance normal ?
Replace TWI (TA) or
TWO (TC2) sensor.
YES
NO
䊶Replace M-HWM
I/F P.C. board.
䊶Check M-HWM
ambient
temperature.
Out of use range →
remove M-HWM
YES