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Replaced pilot sensor. Still not lighting furnace. Have a high humming sound for about 2 mins then nothing. Any suggestions? Furnace is about 8 years old

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  • Robert Nov 05, 2012

    Hello, does the igniter glow?

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  • 293 Answers

The humming sound might be a stuck blower motor or a motor that won't start due to defective starting capacitor.

Posted on Nov 06, 2012

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6ya6ya
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Posted on Jan 02, 2017

hotuna
  • 288 Answers

SOURCE: gas furnace wont stay lite

I'm a little confused by your terminology. You are saying you have a pilot lite and electric heat strips? Are you possibly meaning burners? Is the heater running for 2 hours straight without shutting off? how cold is it there? Lastly what temperature do you have the thermostat set at and how close does it get to the temp. before it shuts off?

Posted on Dec 20, 2007

  • 124 Answers

SOURCE: Sears 92 gas furnace noise when not in air handling mode

a very subtle hum or buzz is normal and is the transformer that creates 24 volt control voltage continually. some are noisier than others . sometimes a tap or bending of the transformer will tweak the metal enough to make it quieter. they can also get loud if incoming voltage is not correct. incoming 120 volts on a furnace is not usually a problem but the transformers are usually wired to the available incoming 230 voltage or 208 voltage if it is a heat pump or electric heat. If it is powered by 230 or 208 volts as most heat pumps are ,then you need to verify which you have and connect the appropriate leads from the trans former to power . it tells you on the side of the transformer which to connect to 230 and which to connect to 208. tape or cap off any unused leads.since you have not mentioned any performance problems i assume the fan does come on when called for and that it is not the loud hum you hear. switching the fan switch at stat to on should bring the fan on right away. if it doesn't then you may hear a loud hum and then youll need to check the fan motor and capacitor. but it sounds like a noisey transformer from here.

Posted on Oct 28, 2008

  • 2 Answers

SOURCE: 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.

Posted on Jan 06, 2009

pierre1811
  • 144 Answers

SOURCE: Code 32 when wind blows

Hi and welcome to Fixya. I believe that the wind is affecting the draft. What I would recommend is to install a cap on the flue that is similar to a weather vane in that it rotates to block the wind from creating a downdraft in the flue. Some times depending on the direction and strength of the wind it will come up over the roof peak and then down the flue. A regular fixed cap may work too. You should be able to purchase one at your local hardware store. Please let me know if this was helpful. Good luck.

Posted on Jan 25, 2009

electrodynam
  • 35 Answers

SOURCE: bryant furnance clicking, won't fire

try checking the pressure sensing switch,it has a tube that should run somewhere close to the inducer fan.sometimes this hose fills with liquids,and makes the units act funny.I don't know if you have a condensing unit or what.the furnace wont try to light if it cant tell the inducer motor is running.any induced draft unit will work this way.you can also do a temp. bypass of the pressure switch to make sure the contacts on it are closing just be sure your inducer fan is running,and you cant leave it like that its just a test.that is a safety feature you really need.

Posted on Mar 19, 2009

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In the mean time you can try cleaning the filter, with a piece of emery or sand paper sand clean the flame sensor (thermocouple) in front of the pilot light (if applicable). Reset the unit by disconnecting the power for 5 min. and tuning it back on.
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Problem: Your furnace will not ignite the gas to produce heat for your home. When a furnace has a bad ignitor what I see most of the time is the following sequence of operation:


1. Thermostat calls for heat.

2. Draft inducer motor starts.

3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes.

4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas.

Solution: You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks. Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout switch problem. Please see "limits, rollout switches & furnace control boards" further down on this page. The furnace's control board might not be supplying the voltage to the ignitor. If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning. Please see the pictures below to help you identify a flame sensor.

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HI; I need more info. How old is the equipment. name brand of equipment. Also to answer Your question ...Yes the tstat wire goes into the furnace to make several connections then a seperate cable(brown) will follow Your freon lines out to the condensor.Also try removing the cover and have a good light. Get someone to turn on heat at tstat and watch for clicking sound.Sounds like You have a spark assist pilot system. When the sparking starts the pilot light should come on. Then once the pilot sensor feels the heat comming from pilot light it will allow the gas valve to come on...BE CAREFULL...I ASSUME NO RESPONSABILITY FOR YOUR ACTIONS...alpharome416 PS.usually there is nothing to worry about just keep Your space to begin with ok.

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