Toshiba MMU-P0121H Service Manual page 99

Check code
[E1]
Fixed-speed high-pressure SW
system alarm (1)
[F0]
Fixed-speed high-pressure SW
system alarm (2)
Does fixed-speed
high-pressure SW operate?
YES
Are fixed-speed high-
pressure SW parts normal?
YES
Defective
Is service valve fully open?
YES
Does cooling outdoor fan
normally operate?
YES
Is there cause to hinder
heat exchanger of outdoor unit?
Blockage in heat exchanger
Short circuit
NO NO
*
1
C
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 unit
9. Pd sensor error
10. Refrigerant over-charge
[E1] : High-pressure SW system error at compressor 1 side
[F0] : High-pressure SW system error at compressor 2 side
NO
NO
Check parts.
Replacement
NO
Open service valve fully.
NO
NO
Is the connector capacitor
and fan motor normal?
Repair failed position.
NO
Are the characteristics of
high-pressure sensor normal?
Replace
high-pressure sensor.
YES
Eliminate cause.
Refrigerant over charge
Blockage
Pipe breakage
Abnormal overload
Operation cause
Is fixed-speed
IOL circuit normal?
Is fixed-speed
OCR circuit normal?
YES
Is circuit wiring normal?
YES
Check outdoor interface P.C. board.
Defective Replacement
*
1 : In cooling only model
3-96
NO
YES
See the judgment flow
of fixed-speed IOL,
OL circuits "E6" "F1".
NO
YES
See the judgment flow
of fixed-speed IOL,
OL circuits "E6" "F1".
NO
YES
Check and modify wiring.