We have a Weil-McLain propane boiler that has been giving us a hard time for decades. We've had techs look at it many times and it seems like they've replaced almost everything without help.
What happens is that sometimes when the boiler calls for hot water, it goes into it's cycle where the power vent kicks on, it attempts to light, fails, then locks up. We often wake up or come home to the power vent running and we then reset the boiler and it fires fine and works as it's supposed to.
Our tech Larry is coming tomorrow, and I know he's been scratching his head trying to find things to check. He often runs into the syndrome of it working fine while he's here, but he has seen it malfunction before. He says it shouldn't and that everything is set as it should be, but we still wake up with a cold house sometimes, or in the summer take showers to find the water turning cold because it's out.
I was wondering if any of you guys have run into something like this or have ideas I could suggest to him? It's a model HE-4, series 3 if that helps.
Don't worry about me touching anything, it's propane and I respect it, and I won't touch anything on it myself. I just am hoping I can give Larry some possibilities to check out.