Toshiba MMU-P0121H Service Manual page 97

Check code
[dd]
Outdoor refrigerant leakage
detection
Cooling only model
In there blockage in
the check valve to interrupt
the liquid line?
NO
Replace the check valve
1. Blockage of check valve to interrupt the liquid line.
2. Outdoor PMV A error
3. Pd sensor/Ps sensor error
4. Blockage in SV2 valve circuit
5. Blockage in SV3B valve circuit
6. Blockage in capillary of bypass between gas pipe and heat
exchanger line
Heat pump model
Are connection of outdoor
PMV A connectors normal?
Are operations of outdoor
PMV A normal?
Are characteristics of
YES
Pd sensor/Ps sensor output
voltage normal?
Is SV2 valve coil
normally connected?
Is there a blockage
in SV2 valve circuit?
Is there a blockage
in SV3B valve circuit?
Is there a blockage
in capillary between gas pipe and
heat exchager liquid line?
Check interface P.C. board.
3-94
Operation cause
NO
YES
NO
YES
YES
NO
NO
YES
NO
No clogging
YES
No clogging
YES
No blockage
Correct connection
of connectors
(CN300 and CN301).
PMV A error
Pd sensor/Ps sensor error.
Modify connector connection
(SV2 : CN312)
Replace SV2 valve.
Replace blockage part.
Replace SV2 valve.