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Furnace motor turns on but ignitor will not ignite. I took drain hose off once and ignitor fired up and furnace ran. i turned furnace off to see if problem was corrected and it happened again.

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  • Anonymous Jan 18, 2009

    HEATER IS BLOWING SOLD AIR LOOKS LIKE THE IGNITER IS NOT LIT HOW DO YOU LITE

    MODEL # M3RL080A

    SER #M3A070600579

  • Danny Clark
    Danny Clark May 11, 2010

    Which drain hose are you reffering to?

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Sometimes the condensate lines can vapor lock of condensing style furnaces. Check all rubber lines. Make sure they are all snug and in place.

Posted on Jan 17, 2009

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Induction fan comes on ignitor wont ignite


If the igniter turns orange and the gas fires for only a second or two then your heat sensor needs to be cleaned with sand cloth, if it does not turn orange then your igniter needs to be replaced.

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Why heater coils glow?


It sounds like you're describing one of two things. The hot surface ignitor in a gas-fired furnace, or the resistive heat strips in an electric furnace.

The hot surface ignitor in a gas-fired furnace lights the burners. This ignitor in modern furnaces serves the same purpose as the standing pilot flame did in older furnaces. It provides the required heat to ignite the gas at the burners. Without an ignition source, a gas-fired furnace cannot provide heat. When the ignitor is activated it will glow bright orange or yellow.

The resistive heat strips in an electric furnace actually provide the heat to a home or building. When the furnace turns on, the heat strips are activated and usually glow orange when they reach peak temperature. In almost all cases, the heat strips are not easily seen or accessed without removing covers or panels inside the furnace.

Feb 28, 2011 | Air Conditioners

1 Answer

My furnace is flashing 21 green and then it flashes red ...the furance will not run . I have replaced the thermostat and cleaned tha condensate drain


not sure what 21 is ,but if you are getting acode normally the code comments are on the door or the manufacture lable to tell you what they are...
i can tell you the operation and maybe that will help you out...
the unit should start off with the enducer draft motor small motor in furnace that pulls all the stale air out..then the negative pressure switch activates which should have a hose coming from the enducer draft moto to the pressure switch..once the pressure switch closes it sends power to the ignitor and the ignitor should glow once it gets hot a milivolt current is sent back to the gas valve and it opens up and fires...after it fires you should have a flame sensor small metal rod in the direct path of flame that keep sensing the flame and sends signal back to board.... unplug unit and watch it start where is it failing or in what part of the operation does it flash a code....

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1 Answer

I have a Rheem furnace rglh-10nbrjr that motor runs but flame does not light. If I turn up thermostat, the fan comes on and I hear a click after 10 or 15 seconds. I see no spark or anything from electronic...


Hi, you shouldn't smell any gas until the pilot flame is etablished. The sequence of operation is the small inducer motor will start on a call for heat, Then on the motor you should have a poly type tube, clear, that runs over to a pressure switch. It is a round silver part that the hose connects to, The pressure from motor closes a set of contacts and you will hear a click. This is telling the electronic ignition to start to spark and light the pilot or hot surface ignitor, which ever you have. If you have no spark and the pressure switch is closed, you have a faulty ignitor board or module. To check the switch, it will have 2 wires going to it. Just take a piece of insulated wire and touch across the 2 terminals. It should fire up. If not, the module or board, ignitor has failed. You will need to take all of the numbers from it amd go to a appliance parts house to get a new one. Don't forget how it wires back in, or you will have more problems.
Sincerely,
Shastalaker7
A/C, Heating Contractor

Dec 28, 2010 | Air Conditioners

1 Answer

It does not fire at all times igniter works, I can hear the gas valve when opens, some times it fires for a minute and some times does not fire at all


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. 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.

Dec 07, 2010 | Air Conditioners

1 Answer

Hot surface ignitor won't ignite,I replaced the igniter and it still won't.


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. 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.

Oct 25, 2010 | Air Conditioners

1 Answer

Gas Furnace is not heating anymore.


the fan you hear come on at a call for heat is most likely just the inducer motor. the click you hear is probably the relay for the hot surface ignitor which should glow red, then in turn ignite the main burners. your going to have to determine if the ignitor is coming on. if it isnt the ignitor is bad and will need to be replaced. if it comes on and than shuts off after a few seconds the ifc board is probably at fault

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1 Answer

Rheem Criterion Ignitor Issue?


Maybe some trash or water got into the hose from the draft inducer to the proving switch It happens this time of year.

Mar 27, 2009 | Air Conditioners

3 Answers

Furnace dont have heat


pressure switch stuck take off hose **** on it then put back on

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1 Answer

Goodman U-30 Furnace


observe the sequence of operation. stat calls for heat and sends a signal, to furnace. check for 24 volts to common and white wire at furnace.first the forced draft motor starts and should have 120 volts to the plug it attaches to. after forced draft motor starts the pressure or vacuum switch closes should show no 24 volt when checked across terminals. shortly after the ignitor glows and shortly after click the main gas valve opens and main burners fire. shortly after the indoor fan comes on and hot air blows into the ductwork. follow the chain of events to see what doesnt happen and it is a clue to whats broke. maybe start by switching fan switch on stat to on. if fan comes on you have high and low voltage thereby eliminating the stat power and transformer as a problem. if you can see the ignitor look for it to be cracked . look close dont touch any part of it .it is powered by 120 volts when energized from board. dont forget when you take the door off there is no power to the furnace so be prepared to tape the safety switch closed when you are diagnosing.

Oct 24, 2008 | Air Conditioners

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