Minimax 400 heats fine but service light stays on

[Bob123]

I have a Minimax 400 heater. When my heater is turned on, the T-STAT, AUX, PRESS and Power are all lit. The heater ignites and heats the water.

However, the Service Light remains solid red while it's heating.

Any suggestions ?

 

[ps0303]

Sounds like something on the system board is causing the issue. I'd suggest you just live with it as long as the heater continues to work.

 

[Bob123]

Thanks. I will do that.

 

[scott hagen]

I have the same heater and it used to have three lights come on when heating and two after temp is reached. Now it has only two that come on and one when temp is reached. I can live with that. Other than maybe a light being burnt out everything still works!