Toshiba MMW-AP0481CHQ-E Service Manual page 86

Check code Check code name
High-pressure protective
operation
[A27]
(H-HWM)
Is H-HWM PMV2
normal ?
1. Connector
connection
2. Wiring
3. Coil
4. Valve body
5. H-HWM I/F P.C.
YES
Are output voltage value
characteristics of high-
pressure (PD)
sensor normal ?
YES
Is H-HWM I/F P.C.
board normal ?
YES
PMV2 trouble
H-HWM I/F P.C. board trouble
H-HWM high-pressure (PD) sensor trouble
Water heat exchanger trouble
NO
NO
NO
– 86 –
Cause
Repair H-HWM PMV2.
Sensor trouble →
Replace
Replace H-HWM I/F
P.C. board.
Water heat exchanger
trouble.
→ Wash out the water
side of water heat
exchanger.