Toshiba MMW-AP0481CHQ-E Service Manual page 85

Check code Check code name
Gas leak detection (R134a)
(H-HWM)
[A26]
Is H-HWM PMV2
normal ?
1. Connector
connection
2. Wiring
3. Coil
4. Valve body
5. H-HWM I/F P.C.
YES
Are connection of TD
sensor and TS sensor
and
low-pressure (PS)
sensor
connectors correct ?
YES
Are characteristics
of
TD sensor and TS
sensor resistance
value normal ?
YES
Are output voltage
value characteristics
of low-pressure
(PS)
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 TD sensor trouble
H-HWM low-pressure (PS) sensor trouble
H-HWM TS sensor trouble
NO
NO
NO
NO
NO
– 85 –
Cause
R134a gas leak trouble
Repair H-HWM PMV2.
Correct connection of
connectors.
Sensor trouble →
Replace
Sensor trouble →
Replace
Replace H-HWM I/F
P.C. board.
R134a refrigerant
shortage, clogging,
pipe breakage.
(Check there is no clogging and pipe breakage
and then recharge refrigerant.)