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I have a lennox whisper heat and the pilot light sometimes wont extinguish after it runs ... when that happens, it wont restart and I have to turn off the power switch, bang on the control box a coupl

I have a lennox whisper heat and the pilot light sometimes wont extinguish after it runs ... when that happens, it wont restart and I have to turn off the power switch, bang on the control box a couple times (pilot goes out) and turn the switch back on... it calls for heat, sparks and the furnace ignites and runs fine till the next time the pilot wont extinguish. Is it my box, thermostat, pilot light or what?

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  • 148 Answers

This sound like you gas valve is stuck

Posted on Nov 23, 2014

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6 Suggested Answers

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Posted on Jan 02, 2017

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Therinnaiguy
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SOURCE: Goodman GMS90904CXA Wont ignite, light blinks 3 times

Ok, you either have a inducer fan issue or a pressure switch issue or a plugged vent pipe. The inducer turns on to establish a draft for the exhaust. If it is not working you will get this error code. If the pressure switch does not sense pressure caused by the inducer, it will give this code. If either the intake pipe or exhaust pipe is blocked (even y just a little) it will give you the same error code. If the condensate hose or receptical is plugged, again it will give you this error code. Good Luck!

Posted on Oct 21, 2008

  • 1 Answer

SOURCE: Lennox Gas Frunace fires goes out, fires goes out, fires goes out

furnace was working fine until the electricity went out for 5 hours now furnace is just humming and then nothing...HELP...

Posted on Dec 29, 2008

  • 11 Answers

SOURCE: Ruud furnace Model URKA A030jK08 Code opt 589

sounds like the circuit running to your condenser powers your furnace. when u disconnect power to the furnace it will reset and run the blower on startup. check the tube connecting the vacuum switch to the induced draft motor. maybe a leak. good luck

Posted on Nov 24, 2009

SOURCE: I have Lennox pulse 21 control module light goes out

If this is a high eff model, check to make sure the intake vent is not plugged.

Posted on Jan 18, 2010

  • 2557 Answers

SOURCE: Lennox gas furnace G21Q4/5-100-1 sometimes won't kick on

Hi check out the flame senser is clean also jump ou tthe pressure switch see if it lights when you do this , igntion modul is just a box with some push on wires just get the right one the info is all on the module

Posted on Feb 16, 2010

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1 Answer

How do I light pilot light?


There should not be a pilot on a direct vent furnace. When you turn up the thermostat for heat the 1st thing to happen is a venter motor should start, it should vent for approximately 45 seconds, the air switch will verify a vacuum in the burner box, then a spark igniter should start clicking to start the pilot, then the flame rod will verify the pilot, the igniter will stop clicking, and the main burner will ignite and remain on until the thermostat has satisfied the set point. These guideline steps must be satisfied before the controller advances to the next step. The 1st step is the venter motor running, sometimes the motor will stick over the summer months, spin it manually to unstick it. PS, nothing runs if the fan door cover is open, as that shuts down the power to the whole furnace.

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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.

Sep 14, 2014 | Heating & Cooling

1 Answer

Weathermaker 8000 58tua stops frequently


Removing the front cover or turning the line switch off and back on causes a "HARD" reset to the furnace. That means, it breaks the line or supply voltage to the furnace and causes the main control board to reset. The main reason for requiring a hard reset is a failure to fire up correctly. There are several reasons for this to happen. If or when the flame sensor detects a flame determines the whole process. When the thermostat calls for heat, the ignition controller delivers spark to the pilot assembly and the pilot gas valve opens. If the sensor detects a pilot flame, the main gas valve opens and the main burners ignite. The pilot flame can be pulled away from the sensor when the main gas opens just long enough to cause this type of failure before the main flame is sensed. The furnace will shut down thinking it is feeding in raw gas with no pilot present to ignite it. All of this happens in just a few seconds. If there is a small window in the burner cover, you can watch it fire after the reset for a clue to the cause. If there is not an inspection window with a sealed combustion chamber to watch it through, it would be best to call a good tech. as it is dangerous with such a short period to ignite while all that gas is flooding the combustion chamber. Check to see if the line from the pilot to the gas valve is tight. If possible, try to move the sensor a little closer to the pilot. If this does not work, best to call a tech. who is familiar with your furnace. Other test with an open combustion chamber are very dangerous and best left to the pros.

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1 Answer

Gas furnace wont light


if pilot light is on, probably should be a knobs with settings for PL only, on, or off.

Nov 09, 2013 | Heating & Cooling

1 Answer

Heat....Furnace will not start up worked fine last year it is getting power... I can hear I light hum in the furnace but it will not start it process


If its a high or mid efficiency furnace most of the time the sequence of operation goes as follows: tstat calls for heat (R&W at tstat ) ventor motor starts, pressure switch closes, spark or hsi lights pilot or main burners. main blower motor comes on. From your description of a humming noise it sounds like maybe the ventor motor is seized.

Oct 08, 2012 | Heating & Cooling

2 Answers

Lennox G8Q3-90-4 will not ignite the pilot. The


While holding down the control knob for the pilot, you either have to use the pilot ignitor or match light the pilot. Then old the knob in for 60 seconds, before releasing it. If the pilot remains lit, turn the control knob to ON. If the pilot does not remain lit, the Thermocouple or Thermopile may need to be replaced.

Hope this helps you to solve the problem.

Mar 23, 2011 | Heating & Cooling

1 Answer

I have a Lennox 80MGF3/4-100A-1 forced air gas heater and the pilot light isn't lighting automatically as it is supposed to. Can I light it manually?


NO, they are not like the old ones that sometimes you had to relight on a windy night.. there is not a gas pressure control lever and too many safety switches will keep things from happening. and the induced draft blower motor would be like starting a fire in a wind tunnel. even if lit. it would extinguish it's self at the end of the heat cycle and put you right back with no flame. i miss old tech!! so easy to fix. and keep it going. are the heating wires getting red hot! those hot wires are what ignite the fast flowing gas.

Dec 23, 2010 | Heating & Cooling

1 Answer

I have a Lennox Whisper Heat that when a call for heat comes, the pilot lights as it should, then after about 30 seconds the blower fan comes on, then its about another minute before the burners light....


Yes it should go in this sequence, first exhaust fan, after establishing air flow you get a pilot, after signal from pilot is established you get main burners, then they have to reach a set temperature on the high limit and then the blower comes in. Now you have several over heat safety sensors one of them could be tripped check by powering the furnace down and see if they have a reset button on them, some do some do not. If not it should be the sensors closest to the heat exchanger and blower assembly use a volt ohm meter and check them should be normally open until temp is established then closed. This is easier done than it is to describe, now locate the high limit switch and bulb and see if it is open across the contacts it should be until it hits temp then it closes to start the blower. Hope this helps instead of confusing the hell out of you. Take your time locate the items then test.

Dec 19, 2010 | Heating & Cooling

1 Answer

I have a lennox furnace that is about 25 years old and for the last few days it doesn't want to kick on. I replaced the thermostat thinking that was the problem, but it wasn't. The problem that I'm having...


I would suggest that you have someone turn thermostat up to call for heat while you are watching. Being that old it may or may not have a induced draft motor on it. It it does the draft blower should come on first, then spark igniter,then pilot ,next the main burner,and after a short period the main blower. If you do not have induced draft motor the spark igniter should come on as soon as thermostat calls for heat. If it doesn't I would check all electrical connections making sure they are all clean and tight fitting. Just follow it through step by step . You can use volt meter to check across red and white wires from thermostat to where they hook into furnace. When you are calling for heat you should read about 24 volts. I would be inclined to replace spark igniter but if it does what it's is suppose to then I would go to gas valve. It might be worth your time to check connections on t-stat. I have occasionally seen wires that were broke under screw and some time make connection and other times not. You can also remove red and white wires from t-stat and temporairly touch them together. this should turn heater on. Hope this helps. Thanks.

Nov 14, 2010 | Heating & Cooling

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