Hayward H400FDN problem

[Eriky]

I just got my pool open and my heater Hayward H400FDN is not showing anything on the LCD panel. When we turned it off last year, it was OK so something happened over the winter.

My pool guy said he doesn't know how to repair this, and that it may be the main panel or main circuit board. I called up a service guy who was recommended for my area and he hasn't gotten back to me, probably extremely busy.

I have done some work on the heater before, fixing the ignitor and cleaning the lines.

I am wondering if anyone can help me understand if I can troubleshoot this myself, or do I need a professional? I have no problem paying someone, I just can't seem to find anyone local.

Thanks

 

[ajw22]

Is your heater connected to any automation?

You have a multimeter? You know how to check voltages and comfortable working around hot electrical lines?

First step is checking for voltage at the power cable going into the heater.

 

[markayash]

Yes verify power to the heater like . If that good there is a drawing inside the side lid and one circuit board with a couple fuses you can check.

 

[wireform]

Any signs of critters chewing up some wiring.

 

[Eriky]

Thanks for the replies! I do have a multimeter and I am comfortable working around lines. I do not have any automatic. The system is about 9 years old. Will the manual show me which wires to check for power coming into the unit?

 

[wireform]

There may be an electrical diagram on the inside of the removable access panel.