Toshiba MMW-AP0481CHQ-E Service Manual page 82

Check code Check code name
High-pressure SW system
trouble
(H-HWM)
[A23]
Dose high
pressure SW
operate ?
YES
Are parts of high-
pressure SW
normal ?
YES
Are output voltage
characteristics of
high-pressure
(PD) sensor normal ?
YES
Is H-HWM
PMV2 normal ?
YES
PMV2 trouble
H-HWM I/F P.C. board trouble
H-HWM high-pressure (PD) sensor trouble
Water heat exchanger trouble
Water heat exchanger trouble
NO
Is circuit cabling
normal ?
NO
NO
NO
Is connector
connection
or coil normal ?
Is there clogging on
whole valve ?
Cause
NO
YES
NO
YES
YES
NO
– 82 –
Note) High-pressure SW is normally closed.(B contact)
Replace TWI (TA) or
TWO (TC2) sensor.
Check H-HWM I/F P.C.
board.
Failure → replace
Check parts.
Failure → replace
Sensor trouble →
Replace
Repair failure parts.
Repair PMV body.
Check H-HWM I/F P.C.
board.
Failure → replace
Water heat exchanger
trouble.
→ Wash out the water
side of water heat
exchanger.