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When the thermastat turns on the furnace doesn't ignite the burners and the pilot light is lit. Everything appears to be normal, fan runs, thermastat appears to work properly.

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You may have an open limit or a bad gas valve. Check and see if you get 24 volts to the gas valve, if you do then you gas valve has gone out.

Posted on Oct 10, 2010

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2 Answers

The heater turns on, but does not ignite. The fan runs for about 5-7 seconds then shuts off. I am assuming the heater needs a good cleaning?


pilot lit on gas furnace, but the burners won't light (Home ...

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Oct 26, 2013 - i have a gas furnace with a lit pilot, but the burners won't light. ... I hv gas furnace we turn thermosate on upstairs but still wont turn on coud turn ...

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If you woke up to find that your gas furnace is not starting or it's ... If this sensor gets dirty (and they almost always do over time) then your furnace will try to light, ... working, you can hear it starting, but the burners on not coming on. ... The furnace nowcomes on every time and the house is nice and cozy.

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Our property manager is great about sending a repairman, but the house is a mess. ... While troubleshooting my downstairs furnacethat wouldn't turn on, I turned off the ... Not sure what to do now about flame rollout switch..

Jan 05, 2016 | Heating & Cooling

1 Answer

Pilot light lit but not igniting to heat water


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Oct 26, 2013 - i have a gas furnace with a lit pilot, but the burners won't light. ... if the thermocouple does not sense the heat of the pilot it prevents the gas controller fromturning on the burners. ... clamped onto the outgoing hot water pipe, if huydronic system) that is telling the furnace it is too hot, whether or not that is true.

Nov 18, 2015 | Water Water Heaters

2 Answers

When I try to use my Thermolaire model SU402E, the pilot lights( and stays lit), but the main burner will NOT ignite.. any suggestions as to what could cause this if the pilot stays lit?


Bad igniter? When you 1st try it the gas valve will give enough gas that you would get the burner lit if the igniter was glowing red. If you're desperate you can light the igniter area w/ an aim n flame, but you definitely want to do that w/ caution and crank up your t-stat so the furnace stays on awhile Cuz you'll have to do it again for heat or buy an igniter($40 or so)

Jan 14, 2015 | Heating & Cooling

1 Answer

Lennox furnace model G11Q3-110 v.2 burners light but go out before fan comes on


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This furnace should light its pilot with a spark then the pilot proves its on ... Troubleshoot an ignition problem on a Lennox gasfurnace .... Pilot and no inducer but is the same model as that great video! ... You probably have dirty burners. ... How do you know spark module is not sending 24 volts to mv and pv ...

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Nov 19, 2012 | Heating & Cooling

1 Answer

Janitrol GUPS075-3 Furnace burners will not stay lit


The first thing I would do is make sure the flame sensor is clean, this is a metal rod immersed in the burner flame on the opposite side of the igniter. If too much oxidation builds up on it, it will not allow the burner to stay lit. To clean, just turn off furnace and remove flame sensor and clean with steel wool and then reinstall. If this does not solve the problem there may be a problem with the gas valve.

Nov 08, 2012 | Heating & Cooling

1 Answer

I have a Model CGN250TE.The pilot light stays lit but when you turn control valve on it stays lit for 5 seconds and then shuts right down,even the pilot light goes out.I have tried venting the room and...


I would first check the gas pressure to your furnace. Then make sure that burners are clean and watch flames when burner first ignites. I have seen burners that were dirty cause delayed ignition that would create a suction when they came on and extingush pilot and burners.
The next thing I would do is change gas valve. Thank you

Dec 19, 2010 | Williams 2509612 Ceramic Mid-Size Heater

1 Answer

Im calling for heat from the thermastat and control panel, the boiler light and and the fan is running, but no matter how many times i keep re trying the pilot and burner will not commence, is there...


I would check to make sure control on gas valve is in on position and pilot is lit if you have a standing pilot. If you have a spark or hot surface ignitor make sure they are trying to lit pilot. If you have standing pilot model and pilot lit is not on. Turn control on gas valve to off,wait five mins. then turn to pilot. Depress botton and try to light pilot. If it lights hold down for a couple of mins. then release.. If pilot stays lit turn control to on. If thermostat is calling for heat this should bring main burner on. If pilot does not stay lit then replace thermocouple. Hope this helps. Thanks

Nov 16, 2010 | Heating & Cooling

1 Answer

Rheem gas furnace pilot lights, but no burners or fan


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.

Jan 06, 2009 | Heating & Cooling

2 Answers

Thermastat and furnace


you should have 24 volts between yellow and white wires at the stat when the stat is set to heat and set as hot as it will go. burners should light first then 3 to 5 minutes later the fan motor should fire up. if burner doesn't light check the wires going into the top of the gas valve see if you have 24 volts arriving there from the stat. if you do then the gasvalve is probably bad. you can bypass the action of the stat by jumping red to white on 90 percent of the stats made and in a few seconds the gas valve should click open gas flow to main burner where pilot ignites it. another easy check you can do is flip stat fan switch to on. fan should come on at once. if not then you have either no high voltage to unit or no low voltage ( as in a bad transformer). if the fan comes on you know you have high volts and low volts...by cover i assume you mean the decorative cover but there second cover with the mercury bulbs and all is still there. if you have only the bare subbase then new stat time. sounds like an old furnace if it has a standing pilot, it should be checked for cracked heat exchanger by a pro with a n electronic carbon monoxide detector. NOT a diy item due to the real danger of co poisoning.

Oct 02, 2008 | Kitchen Appliances - Others

1 Answer

1986 Weathermaker SX 150 series, model S85X060-CC-1


There are 4 -steps for full run time to kick in a furnace.. step-1, inducer fan runs & prove thru the air tube which closes a switch and tell the circuit board to go to step-2, the igniter lights the pilot & prove its lit by heating the thermocouple, which tells the circuit board to go to step-3, opens the gas valve to dump gas in, which will light from the pilot light, and prove by a flame sensor metal stick on the last burner , which heats up and tell the circuit board Saying, ok , I've got flame.. step-4. when the box heats up, it closes a switch and turn on the main fan...! (Some gas-valves has a brain -or circuit board on top of them and are real sensetive to moisture..)

Sep 05, 2008 | Heating & Cooling

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