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Not heating its not igniting inducer comes on then the fan but not igniting

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  • Ken Bledsoe May 11, 2010

    Sounding like hot surface is bad. Can you see inside your furnace area and see if the hot surface is glowing cherry red hot?

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Thanks for every thing its already fix. I jumped the limit switch then hook it back on

Posted on Dec 23, 2008

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How do I wire a induce fan motor


Induced fan motors on older units are wired through the high limit safety on the stack - in series. When the furnace calls for heat, the induced fan motor comes on and after a time the furnace will light.

Older units have a temp switch in the stack that rotates to bring on the burners and blower motor. . When there is a call for heat, the induced draft fan motor comes on and then the burners will light.

After the heat exchanger is warmed up the limit switch will bring the blower motor on. That's basically how it works - there are two circuits - one for the induced draft motor and the burners and the other for the blower and high limit.

New units have a plug on the board you just plug in.

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Oct 04, 2014 | Air Conditioners

1 Answer

When the thermostat calls for heat sometimes the gas pack works fine and sometimes it doesnt work at all . the inducer motor comes on but the burners dont ignite . what could be the problem ?


Could be the igniter or the thermocouple. The blower has to start first and it does but it will run on endlessly without further action unless the igniter heats the thermocouple to open the gas valve and fire the burner.

Dec 15, 2013 | Carrier 3 Ton 13 Seer Commercial Gas Pack...

1 Answer

How to trouble shoot trane 80 gas furnce


The 1st thing I do is go to the thermostat and put the Fan switch from Auto to the On position. If the fan operates this proves you have both high and low voltages and the breaker, fuses, transformer etc is functional, this saves one from going to the breakers and air handler often in an attic or roof or basement.
If the fan does not operate then I check for correct power.
Set the thermostat for heat mode and turn the temperature setting well above the rooms temperature. and observe the furnaces sequence of operation.
What you normally expect is upon the white circuit from the thermostat being energized with 24 volts, the induced draft motor will cycle for 30-60 seconds typically to pre purge the heat exchanger, after this purge the induced draft motor has a pressure switch that senses the induced draft operation thus proving the induced draft motors running and alloqw the ignition to begin, either a spark or a HSI, hot surface ignition type.
If you see no bright white light or hear a sparking noise by the burner area this is normal, this will be followed by a trial period for ignition, meaning the gas valve will be energized for a 30 second trial period, during this time the flame rectification proves a flame exists by a DC signal being sent back to the module by the flame sensor or the ground/burner ground.
This DC signal is very weak and easily interrupted and this is why we clean flame sensors and simply re seating wiring will often times correct a situation,
The typical issues are the induced drat pressure switch and the orifice that it's tubing connects to on the induced draft housing.
This port must be reamed to clear carbon and if not will cause a problem such as locking out requiring resetting power or a 5 hour wait for some units,
You need to insure the limits and roll outs are all closed, its all failrly simple if the LED is tellingyou the error as they do today.

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Feb 19, 2013 | Air Conditioners

2 Answers

The induction fan motor comes on to clear the heat exchanger tubes, but the gas valve never opens, the hot surface ignitor doesn't heat up, the rollout switch is not in reset. I've ohmed it out, it is...


Make sure all hoses to the pressure switch is free of moisture, Check the inducer fan for blockage, check air intake and exhaust pipe for blockage, remove air intake pipe from furnace if you have to. Check all condensate hoses for blockage, check the condensate pump if you have one, and jump out the pressure switch once the inducer motor comes up to speed to test it.

Mar 07, 2011 | Air Conditioners

1 Answer

Plenum seems to be heating up but blower fan cuts out before it can blow heat through the house


Probably a bad fan/limit. The way it works is the heat comes on first then as the air gets warmer the bi-metal twist around on the fan limit and at around 110f the fan kicks in. If the fan don't kick on then the limit kills the heat so the furnace don't get too hot.
Newer furnaces use a computer board to drive the fan with a timing sequence.
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Of course it could be something very simple such as a contaminated flame sensor. If your furnace if one of them fancy new fangled machines which use a draft inducer fan the control may not be sensing ignition and auto cycling on and off. if that is the case get a dry brillo pad and remove the sensor. Give it a good clean and re install it then retry:
Furnace Lockout
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Jan 30, 2011 | Air Conditioners

1 Answer

Carrier 48sx gas pack. Won't turn on. No smell. No igniting sound. Blower fan works. How do I troubleshoot this?


Remove the panel from the heater section, you will need to watch what happends as there is a call for heat. There may be a light on the control board that lights up or blinks to indicate a call for heat. The inducer blower (exhaust blower) will start. INn a few seconds after the blower starts, the igniter will glow orange. After a few more seconds the gas valve should open and the burner will ignite. If the inducer does not run, you may have a bad motor or control board. If the igniter does not glow, you could have a bad pressure switch, bad pressure switch hose or a broken igniter. If the gas valve does not open, you may have a bad control board or bad gas valve. If you get no light on control board, bad fuse, bad thermostat or bad control board.

Jan 03, 2011 | Air Conditioners

1 Answer

No spark on unit


Need more info! Is it a Gas heat unit that is package or split unit? Is it force draft induced? Is there any sounds or audible noise that it is trying to call for heat and ignite? Does the inducer fan spin-up prior to calling for pilot. Is it a pilot light or a Hot surface ingition? Is it a direct spark ignition system?

Oct 07, 2010 | Air Conditioners

1 Answer

I have a technical question regarding implementation of my Carrier furnace within my residence. Specifically, the furnance has been installed for 17 years and I have not had any problems with it. I have...


Thats a safety.

The unit senses a failure to ignite, so it goes into safety mode keeping the blower running to prevent overheating and fires. And keeping the inducer motor running to prevent the same, as well as raw gas build up inside the unit.

The newer systems are "smarter" and can detect more specific problems and failures. The older ones simply know that the thing didn't light, so they bring on the fans for safety.


Jan 01, 2010 | Carrier XHB123D X/Y Series Heat/Cool Air...

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

Apr 09, 2009 | Air Conditioners

2 Answers

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 | Air Conditioners

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