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Old 02-12-2015, 05:17 PM   #31
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Originally Posted by davidsongreg View Post
I just took the heater apart again including removing blowers. I blew everything out, inspected burner element, and put it all back together. Still overheating 😡. Seem to be getting good air flow. I'll try replacing orifice next. I'm at a loss as to what else to do
I would call Airxcel first. Try to talk to a service guy. Derating your BTU will not repair the problem. Has it ever worked that you know of? ASk Airxcel what the temp of the limit is, you stated it cuts out at 175 degrees? You have checked the regulator and it is set at 11" correct? With all you have done already, it might be time to take it in to a service company that can put some meters on it and find the problem. Hate to say that, but your starting to just change parts until you find the right one. The wording seems to get good air flow is tough to measure unless you have a DC amp meter and read the amps it pulling at FLA. I admire all you have tried over and over again but somethings you just have to have the right equipment to measure things. Good Luck, but I would talk to Airxcel and take it to a dealer....

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Old 02-12-2015, 08:22 PM   #32
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It did work fine last year. I think you may be right about taking it to a shop. The problem is finding a good one. The last shop I took it to didn't really know how to trouble shoot beyond the basics. They were one of the shops listed on suburban website for authorized repair. They did cheek regulator.

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Old 03-05-2015, 10:01 AM   #33
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had an issue before with mud daubers in the heating element. had to pull the element and soak the inside to get them out. tell tale sign was little mud globules on the vent..very tiny that scraped off. symptom was carbon build up but i think they could cause the uneven heating and possible hot spot in limit area. interesting how this could just start up...
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Old 03-05-2015, 04:04 PM   #34
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Definitely sounds like a blockage somewhere or possibly the wrong high limit switch installed. I think you're barking up the wrong tree with regards to the orfice. If it hasn't been touched it should be fine. You should make sure that fan is turning in the right direction and is drawing the proper amps. Also if you have and analog thermostat it could possibly be the cylce setting on the thermostat itself. The furnace may be short cycling not actually overheating.

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