Operation LED blinks 8 times and Timer LED shows 21 — Reverse VDD (electric air clean power supply circuit abnormal).

What does Operation 8 Times / Timer 21 mean?

The air clean operation signal was detected for 1 minute when the air clean mode was actually off, indicating an issue with the electric air cleaner power supply circuit.

• The electric air cleaner is defective.
• 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

   Ensure any electric air cleaner components are properly installed and not obstructed.

3. 3

   If the error persists, professional service is needed to check the electric air cleaner or controller PCB.