heater shutting off when water (rain) enters the top...

[taekwondodo]

Model LAAARS LT... If you keep the top vents covered, and avoid letting the rain in, it works... someone moved the "cover" and now it doesn't work again.

Any ideas?

Thanks,

- Jeff

 

[spishex]

What happens when it shuts off? Error? No display? Breaker tripped?

 

[taekwondodo]

So, I "Turn the heater on", nothing happens, then about a minute later, the "hi limit" and "service" LEDs light...

I looked inside, and there was a lot of leaves and tree **** inside.

- Jeff

 

[spishex]

So the fan doesn't even come on?

Well, first thing to do is to check continuity across your high-limits.

 

[taekwondodo]

Are these N/O or N/C switches? Or, should I get a resistance reading? (I'm an electrical engineer by training)

 

[spishex]

Normally closed. There's one on the inlet and one on the outlet, each opens at a set temp with the inlet side having a lower threshold. They're usually set to open somewhere between 115-150 F.

 

[taekwondodo]

Thanks, I'll ohm them out and post a reading - to summarize, they should be closed (infinite ohms) unless the water is at/over temp...

(Edited for stupidity) - OK, I see they're wired in series. I get it (there should be ~0 ohms, unless one of the switches is broken).

 

[taekwondodo]

That was it, the 135oF sensor was bad. Changed it out and it sparked right up!

Thanks millions!

- Jeff