The heater has worked fine for several years when we got it brand new. Now, the pilot light will stay lit and the gas will flow if the unit is kept burning on the highest "5" setting. If it is turned down, or started at a lower setting, it will burn for only a few seconds up to a minute before going out completely. We have replaced the regulator and maintain gas in the outside supply tank. What can we do to resolve the issue?
Thanks for your help!
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So we are talking about the same won't stay lit I will describe both ways. One is when you lift your fingers off the knob it goes out that instant which is probably the thermocouple needs replaced,look to make sure the tip of the thermocouple is in the flame of the pilot light first. The secound version of it is it goes out in a few minutes up to a few hours.The second version is most common.There is a part called a Thermocouple that is mounted next to the pilot light, it is around 3/16 of a inch diameter 1 to 2 inches long and should be mounted so the tip is in the flame of the pilot light. This is what tells the gas valve the pilot light is burning. If any dust ,cat hair ,dog fur what have you gets around the base of the hole the gas from this pilot light comes out of it will bend the gas, which move the flame so it does not hit the thermocouple like it should, this is below the flame so what ever is in there diverting the flame dose not burn up.A draft from a fan or door could do it also.I have used a procom ventless heater as my only heat for 7 years and have to blow it out twice a year. I bought a new thermocouple at the same time I bought the heater to have in the closet in case it went bad some night, it is still hanging there .Because it sucks air in from the bottom past the flame and out the top everything in the air gets burnt into a fine ash dust. So if you use compressed air to blow out your unit you might want to hold a wet towel up in front of it hoping a lot of that white powder dust will stick to it instead of flying around the room . My flame always looks so much better ,less orange and more blue after this .
The thermocouple does not affect the lighting of the pilot, but it does affect the pilot flame staying lit, once you release the gas control valve, before turning it to the ON position. If you could furnish more information about your heater (Brand & Model Number), I can supply you with more information on how to solve the problem.
sounds like your thermacouplar is going out and needs replaced. Sometimes these will act like they are working fine , but when the pilot stays on for awhile and later goes out it is a sure sign that it is bad
You must clean the pilot regularly to ensure it burns properly. Use a small can of air for cleaning computers and blow air through the pilot to remove dust and small particles that accumulate in the pilot barrel. Use several burst being that it is 2 years old and has not been blown out. THe manual references cleaning the pilot in the maintenance section.
The Pilot indicator will appear to line up with the arrow on the base, and even push in as though allowing gas to flow, but if it is just 1mm out of alignment, no gas will flow. So the solution is to move the valve in the Pilot mode slightly in one direction or the other to see if/when gas flows.