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I have replaced the inducer control board but still cannot get the small fan to run. I have 120VAC to the board but not on the card edge that goes to this fan. How is the relay energized?

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Fan relay is on the PC board. Is the LED on the board registering the call for heat by blinking?

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Draft inducer fault


Pressure switch is not proving that the inducer fan is running. First check to see if draft inducer fan is running that will be the small black fan that is hooked to the vent pipe. If fan is not running then replace fan. If fan is running then check the small rubber tub that runs from inducer blower blower to draft switch make sure the hole in the blower cage is not stopped up with rust you can clear this with a sewing needle. If this is clear then check the pressure switch with a volt meter make sure it is getting 24 volts to the switch and through the switch. If it is getting to switch and not through switch then replace the switch.

Oct 21, 2014 | Dayton Gas Furnace Heater

1 Answer

Model m1mc 090a bw furnace pressure switch open. inducer motor is pulling .45 w.c . the intake pipe above inducer is only pulling .1 w.c. . checked for venting and intake blockages found non. removed...


did you check the hose from the inducer to the pressure switch? HAVE you unplugged the unit from the wall outlet to reset the board? DO you have a voltmeter? If you do you can run voltage across the switch and if you get 24 volts you are open.

Oct 23, 2013 | Coleman Intertherm Nordyne Miller Furnace...

3 Answers

I have a Heil H9MPDO75F2AZ QUIET COMFORT FURNACE and have replaced pressure switch and still not running


Hi Kim,
A couple things to check:

1) OK, you've replaced the pressure switch - good stuff. But the neoprene hose running from the pressure switch to the inducer motor... does it have any tears or cracks? Is the hose fittings clogged on the inducer side? Clean/replace as necessary if so. You cannot have any leaks or restrictions in this hose.

2) Try disconnecting the inducer (spent fumes exhaust fan) motor and check this motor coil for continuity with a multimeter. If the motor coil is dead, you'll need to replace the inducer (about $120.00?).

3) Check during initial startup of a heating cycle that there actually is 120vac arriving at the inducer motor coming in from the control board. If not, your board may be at fault.

Hope this helps!
Papa Fixit

Oct 25, 2011 | Goodman GMS90703BXA Heater

1 Answer

My heater isn't blowing any heat. I hear the fan come in, and i think i hear the gas come on, but nothing comes out of the vents. The fan only comes on for a couple of minutes and then goes off.


Ok so here is a sequence of the heater lighting and the solution for your problem...
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.
Thanks and I hope this helps. Feedback apprec.

Jan 28, 2011 | Honeywell Electronic Programmable...

1 Answer

I have no power (120VAC) coming from F2 terminal of Fenwall 1466H Ignotor Control. Draft inducer will turn on and oven is inop due to this. I would like internal connections of controller to verify loss of...


I'm assuming you meant to say your draft inducer will NOT turn on. I unfortunately do not have a wiring diagram in front of me (they are usually stickers inside the burner compartment) but you should check to make sure your hood fan is running and that the air switch for the hood fan is closed, your ignition module wont receive power until the hood airflow is verified.

Sep 06, 2010 | Baxter BXA2G Stainless Steel Gas Single...

1 Answer

Lennox pulse 21 furnace - nothing runs on but control board tries


you will need to verify voltage from the board to the inducer. If you have the installtion manual there is a flow chart for the sequence of operation of the furnace.
The basic sequence is:
1. thermostat calls for heat
2. inducer motor starts and runs for a pre-set amount of time
3. the pressure switch closes and allows for ignition trial
4. ignition is proved back to the board allowing the system to operate.

Verify 120VAC to the inducer motor upon call for heat from stat, if you have 120 at the leads that connect to the inducer and it does not start , the motor is faulty. If the inducer starts use a voltmeter across the pressure switch terminals, a voltage reading of 0 VAC will verify contact closure and ignition should occur.

The pulse furnace was under a factory recall due to breaches in the heat exchanger, unfortunately for you, the Lennox Corp. has ended the program that allowed for an allowance / furnace for replacement. To test the heat exchanger a special kit is required from lennox that will verify integrity of the heat exchanger. (If the heat exchanger seal has been comrimised the pressure switch will not prove and the igniton sequence will be interupted and cause the system to go into "lock-out" mode).I know this is probably not what you wanted to hear. Hope this helps, please list as "very helpful" if it did

May 08, 2010 | Heating & Cooling

1 Answer

Draft inducer runs continuously, unless i turn the furnace off at the fused switch on the furnace. Turning the Honeywell thermostat to the off position does nothing to stop it, nor does removing the front...


Sounds like some one needs a new induce draft fan relay, if relay is located on the main control board you have to replace control board,follow wires from inducer motor and you will find the relay. I could help you more if i knew model # and serial # of the furnace, Good luck.

Feb 06, 2010 | York Furnace Draft Inducer Blower Fasco #...

1 Answer

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.

Mar 11, 2009 | Heating & Cooling

1 Answer

Gms80904bna


Since you have 24VAC, put a jumper between “R” and “W”, you should hear a relay click from the control board, this is for the inducer motor, if you don’t have 120VAC at the board, you have a faulty control board, it’s the same scenario if you do NOT hear a click.

Hope this helps

Oct 25, 2008 | Goodman GMS80904BNA Open Flame Mid-Size...

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