Toshiba MMU-P0121H Service Manual page 69

Check code
[22]
High-pressure protective operation
Is the high-pressure sensor
characteristics normal?
YES
Is service valve fully open?
YES
Does cooling outdoor fan
normally operate?
YES
Is there a cause to hinder
Q
heat exchanger of outdoor unit?
R
Blockage of heat exchanger
Short circuit
NO
Is SV2 bypass circuit normal?
YES YES
B
1. Pd sensor error
2. Service valve close
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
NO
NO
NO
YES
Remove cause.
NO
*
1
Repair SV2 bypass circuit.
Refrigerant over charge
Blockage
Pipe breakage
Abnormal overload
Operation cause
Are the connection, capacitor,
and fan motor normal?
YES
®
Check outdoor interface P.C. board.
Defective Replacement
(Coil error, disconnection of wiring, etc.)
*
1 : In cooling only model
3-66
®
Check parts.
Defective Replacement
Open service valve fully.
NO
Repair defective position.