Cause of error code Er:20

High Limit Overheat Switch – Closed is Normal, Open is Fault

Solution for error code Er:20

Press the Power button to clear the Error Code.

- Inspect the High Limit Overheat switch. Ensure proper connections.
- Check High Limit Overheat switch resistance. If resistance is zero, replace the switch.
- If the problem persists, replace the main control.