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Draft Inducer problem

The furnace is heating normally when being called on, but when the furnace shuts down the draft inducer continues to cycle on and off. When heat is called again, the draft inducer stays on normally. If I turn the furnace off at the thermostat is shuts off. And comes back on again normally when heat is being called for.

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  • jim_barne94
    jim_barne94 Jan 15, 2012

    I am discounting the vacuum switch, because if I pull off the hose to the Inducer the furnace will not start. When I re-apply the hose the furnace will start normally. The only solution I am thinking it is the fan timer board. Still looking for help before I proceed in trying to replace the timer board.

  • jim_barne94
    jim_barne94 Jan 24, 2012

    I was able to find a timer board on ebay for $40, changed it out and it seems to have solved the issue. I did notice after taking out the old board there was burn marks on the back side of the card, looks like it was time to replace it.

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On the call for heat from the thermostat the inducer should come on first, a pressure switch proves that the inducer is moving enough air up the stack, closes and energizes the ignition and burners come on. 30 to 60 seconds later the blower comes on. Everything should stay on as long as the thermostat is still calling for heat. When the thermostat is satisfied the burner and inducer shut off and the fan will run to remove the heat from the heat exchanger and then shut off. Cycle complete. Some inducers have a post purge so when the thermostat is satisfied the burner shuts off, the inducer runs for 30 seconds or so and then shuts off. I am thinking that your furnace may be running on the limit switch and when the burner is off but the inducer stays on, maybe the limit is shutting of the inducer. Check your air filter and make sure all your heat registers are open and that the return air grill is not blocked.

Posted on Dec 08, 2017

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Posted on Jan 02, 2017

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SOURCE: Pressure, draft safeguard, or aux limit swtch did not close or re

The limit switch on the inducer has tripped. There are two wires that go to a small disk about the size of dime that has a small button in the center. Push this little button and you will feel a littl snap and the unit should fire up. Check all the manual reset limits as well. If the unit still won't start, jump the two wires by bypassing the limit switch. If it starts, then replace the switch. Bypassing the switch is only temporary and could lead to death if it is used as a permenant fix.

Posted on Apr 03, 2009

motor1258
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SOURCE: Gas Furnace will not start when outside temperature rises to 50F

The anticipator basically prolongs or reduces the time from shut down to start up, so your furnace or air conditioner isn't cycling too much , off and on. It also will anticipate that the setting you have the thermostat set at is near, and will shut thermostat/burner off early, assuming that the temperature will be reached soon, just from heat already in chamber being circulated through system. If it gets too cold before furnace turns on, adjust anticipator, if too hot when it shuts down, go the other way, but whenever you move it, just go a little at a time, until you get it where you want it.

Posted on Mar 13, 2010

Testimonial: "Thanks for the explanation about anticipators. Do they figure much in furnace problems?"

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Draft Inducer Motor runs continuously and the furnace does not heat


If the Gas Furnace's Draft Inducer Motor runs continuously and the furnace is not heating, it is most likely "locked out" as a result of a safety device sensing a dangerous or out of ordinary condition. There are a few things you can check. Here is a video explaining how a gas furnace works and demonstrating how to identify some of the most common safety devices that you should check.


Here is a video that contains information on another common failure, how to identify it, and what to do.

on Mar 20, 2010 | Heating & Cooling

1 Answer

Need to find a replacement part


Here you go Angela

1149097 Draft Inducer Assembly - AllParts Heating

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Nov 27, 2016 | Heating & Cooling

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I removed my Fasco 7021-11577S when the bearings went bad and ordered the A225 OEM replacement. I notice that when mounted this new draft inducer it whistles really loud .Is the hole in the back of the...


There should be a gasket between the mounting flange of the inducer motor and the furnace. If you do not have that you can use a small bead of blue or red silicone caulking to seal it. Hope this helps you. Thanks

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1 Answer

Induction fan motor cycles on and off , with no call for heat


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.

Nov 26, 2010 | Heating & Cooling

1 Answer

I have a furnace that has a draft inducer blower that will start and shut down, it will re-start and shut down again or it may run through the entire cycle and run fine. I had a heating tech take a look at...


Certainly wouldn't rule out the blockage as your friend suggests. Perhaps pulling it out, and a flashlight and if necessary a mirror to get a good look in there. May have to head up to top for a look as well. As long as blower sounds like it's running good speed wise.

Nov 21, 2010 | York Furnace Draft Inducer Blower Fasco #...

2 Answers

Gas Furnace will not start when outside temperature rises to 50F


There is a pressure switch near your draft inducer motor that needs to close when draft inducer motor is running. Verify that the switch is closing. If it is not closing, you might have a problem with either the switch itself, or there could be some sort of blockage in your flue. I would start with the switch first. This switch has to "prove" before it will allow anything else to happen. The loud click could be from your switch or your gas valve. If the switch is closing and nothing else is happening, it could be a problem with your gas valve or HSI.

Mar 12, 2010 | Carrier XHB123D X/Y Series Heat/Cool Air...

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How does a draft inducer blower work


A draft inducer blower is used to create a proper draft in a chimney or exaust pipe from your water heater or furnace. In a high efficiency furnace or water heater, there is not enough heat expelled from the unit to the chimney to create a proper draft. The toxic carbon monoxide gas which is expelled through the chimney from your appliance is normally carried upward due to the rising hot air in the chimney. When appliances got more efficient (putting more heat into the water tank and less going out the chimney), manufacturers had to add this blower to help get the gases out the chimney since there wasn't enough hot air to create a draft.
Hope this helps.

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Janitrol/Goodman GMP075-3 Draft Inducer Fan Won't come on


most forced draft fans are powered by 120 volts . close to the fan is usually a plug that unsnaps. create a call for heat after turning off to clear safetys and see if your getting 120 to fan on initial call for heat. if you are then fan draft motor is bad, usually sold as an entire assembly replace exact as it came out. sequence of operation is..... stat calls for heat via common and white wire to furnace , 24 volts. ......board sences call and sends 120 volts to forced draft ........ motor runs and creates pressure on proofing switch,....... switch closes 24 to board and tells it draft fan is on......... board then energizes ignitor,....... after ignitior glows gas valve is opened and burner lights ........ either ignitor or seperate sensor rod tells board the burner lit........ and a few minutes later the fan comes on and hot air is blown out. if a step is missed or doesn't proof the furnace either trys up to three times to light or locks out. turning off power usually resets safetys and it will resume attempts to lite normally.

Oct 25, 2008 | Heating & Cooling

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