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Furnace pilot light turns on furnace lights then shuts off

The pilot light works just fine and the furnace starts up but then shuts off immediately.  It keeps trying to start but the same thing keeps happening.  Then out of the blue the furnace will work just fine!?!?!

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If you have a hot surface igniter (glow coil) it has a secondary purpose after ignition and that is to sense that there is actually flame present. If the HSI is located on one end of the burners look to the other and see if there is a small rod that protrudes in to the flame as well. If so it is part of this flame proving cycle. Take some sand cloth and clean it. This may buy some time but the rod should soon bee replaced.

Posted on Jan 17, 2009

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Jan 05, 2016 | Heating & Cooling

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If the pilot go out on a furnace would gas continue to flow to the pilot , or would it shut off with in a few seconds


The pilot flame heats a thermocouple, so if the pilot goes out, the thermocouple cools and shuts off the gas. It can take anywhere from 20 seconds to 2 minutes for it to shut off. You should hear an audible click when it happens.

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Where is the furnace breaker


Is the pilot light lit? There should be a valve that turns the gas off at the furnace itself. This valve is for the pilot lite There is no breaker of sorts but rather a sparker that lights the furnace. If the furnace does not light there is a small 12 volt valve that shuts off the gas to the furnace but not to the pilot light. Also make sure your 12 volt system is connected and operating. It wont work without it as it operates off that system not 120V. The same goes for refrigerators, the will not function with the 12v system disconnected

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I have a carrier 58RAV050-12 and my furnace won't turn on. It was working earlier today but it just stopped. Any suggestions as to why?


Check the pilot lt. If its out shutdown your furnace and call a repairman. If the pilot light is on, the flame sensor might have gone out. It's a long silver sensor that sits in the pilot light flame and senses when the flame is present. If it isn't working the furnace will automatically shut down.

Nov 04, 2013 | Carrier Weathermaker 8000 Gas Furnace 125k...

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if you are by passing stat at the gas valve and it is still not working,i would assume a bad control valve.

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Garage furnace (standing Pilot) pilot stops after 30 mins.


it sounds like the afc the fan control not working could be dust on the afc

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If the burners do not fully ignite, the sensor will shut the furnace down. The lack of sufficient burner flame is a gas valve or gas pressure problem within the valve.
Replacing the gas valve with the original one may get you going. I surely suggest a professional service company for safety reasons and a thorough inspection. A 20 year old furnace is past it's normal life span.

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1 Answer

Pilot lights fine, furnace fires up, when it turns off the pilot goes out


need to have at least 3 feet of vent out of the roof, if it is to low the coll air will cold soak down to the pilot and shut it down.

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