[22] High Pressure Protective Operation - Toshiba HFCR407C Service Manual

Diagnostic procedure for check code
Check code
[22]
High pressure protective operation
Is the high pressure sensor
characteristics normal?
Yes
Is service valve fully open?
Yes
Does the outdoor fan operate?
Yes
Is there a problem with the
outdoor unit heat exchanger?
(1) Blockage of heat exchanger
(2) Short circuit
No
Is SV2 bypass circuit normal?
Yes
Refrigerant over charge
Blockage
Pipe breakage
Abnormal overload
Troubleshooting
Operation cause
1. Pd sensor error
2. Service valve closed
3. Outdoor fan, capacitor error
4. Indoor/Outdoor PMV blockage
5. Outdoor heat exchanger blockage
6. SV2 circuit blockage
7. Communication error between indoor and
outdoor units
No
No
No
Yes
Remove cause.
No
Check outdoor interface PC board.
If defective, replace.
Repair SV2 bypass circuit.
(Coil error, disconnection of
wiring etc.)
87
Check parts.
If defective, replace.
Open service valve fully.
Are the connections for the
capacitor and fan motor
normal?
Yes
Repair defective part.
No
14