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16.4.5 H16 (Outdoor Current Transformer Open Circuit)
Malfunction Decision Conditions
A current transformer (CT) is detected by checking the compressor running frequency (≥ rated frequency) and
CT detected input current (less than 1.14 A) for continuously 20 seconds.
Malfunction Caused
CT defective.
Outdoor PCB defective.
Compressor defective (low compression).
Troubleshooting
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
Check the functionality of current transformer (CT).
Is the CT open circuit?
Is the running current less than 0.65 A and suction pressure
120 psi?
Force heating operation and measure:
When abnormality indication starts again.
NO
NO
YES
YES
Running current.
Replace the outddoor PCB.
Replace Compressor due to compressor low
compression.
Check for gas leaking source; Repair or replace
defected part(s).
Suction pressure.
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