Toshiba MM-A0280HT Service Manual page 95

Fixed-speed high-pressure
SW system alarm (1)
Fixed-speed high-pressure
SW system alarm (2)
Does the fixed-speed
high-pressure SW operate?
Are the fixed-speed high-
pressure SW parts normal?
Is service valve fully open?
Does outdoor fan
14
Is the outdoor heat
exchanger blocked or is a short
circuit evident?
Refrigerant over charge
Blockage
Pipe breakage
Abnormal overload
Troubleshooting
Diagnostic Procedure for Check Code
Check code
[E1]
[F0]
No
Yes
No
Yes
Check parts.
If defective, replace.
No
Yes
Open service valve fully.
No
operate?
Yes
No
Repair failed position.
No
Replace high-pressure sensor.
Yes
No
Eliminate cause.
Operation cause
1. Fixed-speed compressor high-pressure SW error
2. Fixed-speed compressor IOL operation
3. Service valve closed
4. Outdoor fan, capacitor error
5. Indoor/Outdoor PMV blockage
6. Outdoor heat exchanger blockage
7. SV2 circuit blockage
8. Miswiring of communication between indoor and
outdoor units
9. Pd sensor error
10. Refrigerant over-charge
[E1]: High-pressure SW system error compressor 1 side
[F0]: High-pressure SW system error compressor 2 side
Is fixed-speed
IOL circuit normal?
Is fixed-speed
OCR circuit normal?
Is the capacitor and
fan motor normal?
Yes
Is the circuit wiring normal?
Are the characteristics of
high-pressure sensor normal?
Yes
Check outdoor interface P .C. board.
If defective, replace.
96
No
Yes
See the judgment code
of fixed-speed IOL,
OL circuits "E6" "F1".
No
Yes
See the judgment code
of fixed-speed IOL,
OL circuits "E6" "F1".
No
Yes
Check and correct wiring.