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Question DetailsAsked on 1/27/2018

Why will my natural gas heater not stay on?

I have a natural gas heater that will not stay on. The pilot stays lit and never turns off on its own. But when I use my controller to turn the heater on, it turns on for approximately one minute and shuts off. Then it will not turn back on again for a long time. But I did figure out that when I leave the large glass cover off, the heater stays on with no issues. As soon as I put the glass cover back on, the flames get a little bit bigger and then it shuts off again. I have replaced the batteries on my remote and I do not have a wall controller for the heater. Any feed back would be greatly appreciated!!

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Since removing the glass cover solves it, and with the flame lengthening before it goes out, sounds to me like air starvation - but could be a firebox overtemp safety shutoff actuating too. I would start with the owners manual, and cleaning any air intake or filter it talks about - some of them are on the BOTTOM of the unit and near inaccessible, a screwy place to put them.


Also check for an air vent near the glass door - some have an adjustable air vent opening.

Also - check the flue (especially if this is a direct-vent unit with plastic pipe flue) for possible icing up of the pipe - in its run or especially frosting over of the outlet, causing backup of the flue gas which a sensor then detects (as overheating, loow oxygen, or low airflow) so it shuts off the unit. Checking for energy cutoff across the sensors might tell which one might be doing this. And of course, check owner's manual, if this is an electronic unit, for the LED trouble codes - sometimes an LED display showing an alphanumeric code, sometimes by showing different colored LED combinations of off and on, sometimes by a blink code of shorts and longs on just one or two LED's. Here are a couple of previous similar questions with answers which might help too, and some more links to other similar questions within one or two of them too: http://answers.angieslist.com/I-natur... http://answers.angieslist.com/Have-wa... http://answers.angieslist.com/Water-h...

Answered 9 months ago by LCD




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