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16.5.46 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.
Replace the outdoor unit
PCB (main).
Is the current < 0.65A?
Operate heating operation.
When F46 occurs again, turn
OFF the power.
Check the 2/3 way valve.
Is the 2/3 way valve closed?
Check for gas leakage.
Open the 2/3 way valve.
No
Yes
While the system is still in
heating operation, check the
discharge pressure.
Turn ON the power, and
operate heating operation.
No
Yes
Is the oil oozing out from
the 2/3 way valve?
- Repair the pipe flare or
union nuts
- Reclaim and recharge
refrigerant
Yes
No
Measure the current from
the outdoor LIVE terminal.
- Defect in CT
- Replace the outdoor
unit PCB (main)
Is the pressure unchanged (same
as when compressor stop)?
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.
Replace the compressor.
No
Yes
Yes
Troubleshooting:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
Caution