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17.5.47 Outdoor Current Transformer Open Circuit (F46)
Malfunction Decision Conditions:
A current transformer (CT) open circuit is detected by checking the compressor running frequency ( rated
frequency) and CT detected input current (< 0.65 A) for continuously 20 seconds.
Malfunction Caused:
1 CT defective.
2 Faulty outdoor unit PCB (main).
3 Compressor defective (low compression).
Abnormality Judgment:
Continue 3 times in 20 minutes.
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Troubleshooting:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
Operate heating operation.
When F46 occurs again, turn
OFF the power.
- Replace the pipe flare or
union nuts.
- Reclaim and recharge
refrigerant.
While the system is still in heating operation,
further check (by touching) if;
- Compressor discharge pipe is cold.
- Compressor body is warm to confirm the
compressor low compression.
Measure the current from
the outdoor LIVE terminal.
While the system is still in
heating operation, check the
discharge pressure.
Is the pressure unchanged (same
as when compressor stop)?
Is the current < 0.65 A?
Check the 2/3 way valve.
Open the 2/3 way valve.
Replace the outdoor unit
PCB (main).
- Defect in CT.
- Replace the outdoor
unit PCB (main).
Replace the compressor.
Is the 2/3 way valve closed?
Check for gas leakage.
Is the oil oozing out from
the 2/3 way valve?
Turn ON the power, and
operate heating operation.
