[Be] Low Pressure (Ps) Protective Operation - Toshiba HFCR407C Service Manual

Diagnostic procedure for check code
Check code
[bE]
Low pressure (Ps) protective operation
Does the indoor fan operate ?
Yes
Is there a blockage on the indoor
filter or heat exchanger ?
No
Are the gas pipe and liquid
pipe service valves of the
outdoor unit fully open ?
Yes
Are the characteristics of low
pressure sensor normal ?
Yes
Is SV2 bypass circuit normal?
Yes
Is the wiring correct ?
Yes
Insufficient refrigerant, blockage,
pipe breakage.
Troubleshooting
Operation cause
1. Ps sensor error
2. Service valve closed
3. Indoor fan capacitor error
4. Indoor/outdoor PMV blockage
5. Indoor heat exchanger blockage
6. SV2 circuit
7. Incorrect wiring of communication cable between
indoor and outdoor units
Are the following items
related to indoor fan
No
motor normal ?
1. Connection
2. Capacitor
3. Motor
Yes
Yes
No
No
No
No
(Check miswiring of the outdoor unit according to miswiring check function.)
105
No
Repair defective part.
Check indoor PC board.
If defective, replace.
Clean or remove blockage.
Open valves fully.
Replace low pressure sensor.
Modify SV2 bypass circuit. Is SV2 bypass
circuit normal ?
Set normal wiring.
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