Cause of error code Er:72

Flame Signal Detected before Ignition

Solution for error code Er:72

This Error Code will go away when the condition is remedied.
If Error happens again:

- Check the water heater cover. Ensure it is secure. Flame detection sensor can detect an external light source.
- Check flame detection sensor. Ensure connections are secure. Normal operating settings are more than 2.5DC before ignition, less than 2.5DC after ignition.
- If the problem persists, replace the main control.