Operation LED blinks 3 times and Timer LED shows 18 — CT error (Current transfer error).

What does Operation 3 Times / Timer 18 mean?

The current value during operation drops to zero amps one minute after the compressor starts, indicating a current transfer issue.

• The CT (Current Transformer) wire is open (disconnected).
• The controller PCB is defective.

Click steps to track your progress.

1. 1

   Reset the power to the unit by turning it off at the circuit breaker, waiting 30 seconds, then turning it back on.

2. 2

   If the error reappears, professional service is needed to check the CT wire connections and the controller PCB.

3. 3

   Avoid operating the unit if this error persists, as it indicates a serious electrical fault.