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I have a gmh80703 goodman and the inducer will come on two seconds, shut off, turn on and shut off, it never stops. I replaced the board last year and it worked fine until this year. would it even start the inducer if the pressure switch was closed. I am lost

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Posted on Jan 02, 2017

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SOURCE: need help with a goodman gmt070 furnace

it may be clogged at the barbed fitting on the induced draft motor where the pressuer switch tubing connects. take a paper clip and **** it out make sure you can stick it thru freely till you can feel the Inducer wheel then reconnect and try again.

Posted on Nov 05, 2009

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SOURCE: Goodman GS9 propane furnace inducer motor runs continuously

it sounds like the low temp limit switch, the one that cools the furnace down with the burner off and the thermostat open, when it cools to a point the fan stops, the other switch in burner area turns burner off/on, hope this helps

Posted on Jan 31, 2010

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SOURCE: if the pressure switch fails to close is this

Do not assume that the pressure switch is bad nor the vent motor. The first thing to check is the vacuum hose from the pressure switch to the vent motor. Sometimes they get moisture in them and sometimes they get clogged in the start tube on the vent motor. Take a small needle or paper clip and clean out the start tube on the vent motor. Check the hose for dry rotting or leaks. Cut the ends back about an 1/2" if you have enough hose extra and then re-connect. Next step is to check your flue pipe for a restriction like a birds nest or a wasp nest in the outside termination point. Then to eliminate the vent motor from the equation, take the vacuum hose off the vent motor start tube and with the furnace calling for heat , **** on the hose to keep a constant vacuum on the pressure switch. Watch the ignitor glow or spark ingition start to spark. make sure it lights the burner runners and all burners are lite. usually the ignitor is on the first burner and then there is a flame sensor on the last burner. If the flame does not ignite to the last burner the flame senor will kick tell the control board to turn off the gas valve and shut down. If this happens pull the flame senor out with a 5/16" nut drive and clean lightly with sand paper and re-install it. Start the process over and you should have sucessfully fixed your furnace. If the constant vacuum does not bring on the ingnitor replace the pressure switch.

Posted on Nov 19, 2010

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1 Answer

Why does inducer motor run nonstop on goodman furnace?


possibly a board issue does inducer shut off when no call for heat

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I have a Goodman GMS9 Furnace that ignites and runs perfect for about 5minutes and then I will here a woosh of air and the flame goes out and inducer motor stops for about 3 seconds, then it re-lites and...


Hello,
This is a common problem with this brand and can even often fool HVAC contractors! There is a control module/circuit board inside the furnace that needs to be replaced for proper operation. The circuit board controls multiple functions and switches and relays inside the equipment and it begins developing a mind of it's own and starts turning certain things on and off at improper sequences. Most of Goodmans furnaces come with a 10 year parts warranty, so try exhausting that resource first before buying one.
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Good morninng, My Goodman furnace inducer stops and starts at various intervals. At times it runs fine but starts the same issue. Everything starts up accordingly, runs and then the inducer stops for...


Replacing the board, flame sensor, and pressure switch, and cleaning out the induction motor was definitely a good start. Other things to check would be a blocked or restricted flue pipe, I have ran into a few bird nest before!, and you also want to check or replace the hose that runs from the inducer to the pressure switch if you haven't already. To be honest, most of the time I clear out the nipple on the inducer where the hose goes with a small piece of wire and it works. The last thing I would suggest is making sure the new pressure switch is rated for what you need. Alot of the revisions on furnaces actually call for less than the original pressure just for this problem. Hope this helps and good luck!

Feb 15, 2011 | Goodman GMS90703BXA Heater

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Hello there, I have a Goodman GMH951155DXAC furnace that I got in 2007. I have the following problem for the last 4 years: When the thermostat calls for heat the induced draft motor comes on and 30-40...


With furnace OFF ,Disconnect the top of the hose that leads to the
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I have a downdraft Goodman furnace. On only some occasions the blower will start, then after a few seconds I will see the igniter light up, but then I do not get the rush of gas and lighting of the...


It sounds like you got a tough one there.When you say the blower starts up and then the igniter comes on are you refering to induced draft motor or main blower. The proper sequence is for the thermostat to call for heat at which point the induced draft motor should come on and run for 30-45 seconds,then the igniter should heat up for a few seconds then gas valve should open and main burner should light. After limit switch reaches set point for fan on ,blower should come on till after heat has reached thermostat setting then burner should go out, and blower run until fan off setting is reached on limit switch. If your furnace is not following this sequence and then not always doing the same thing in the same order,I would recommend that you change out board again. I have had several problems similar to this with Goodman units and all but one time installing new board solved it. That time I did everything I knew to do and talked to factory service techs repeatedly and finally installed new furnace. As far as your question about insulation,. As long as it is fire proof I can't see where it would hurt anything. Sorry I'm not more help. Good luck and thanks.

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Ok, a flashing 3 on a Goodman control board usually means that the pressure switch is tripping. A few things will cause this. One being a restriction in the exhaust or combustion air inlet. The second could indicate a faulty inducer blower motor and the third would be a blocked or bad pressure switch.
 
With the front cover off and door switch taped down, Have a helper turn the thermostat up to 75. You will be watching the circuit board for flashing lights and in a few seconds the inducer motor (the small fan hooked to the exhaust) will start. If this does not happen, we either have a bad circuit board or blower motor. If the fan starts rotating, inspect the hoses going to the small circular pressure switch. Sometimes they may get either water or debris in the hose and not allow the switch to sense pressure. If the hoses look OK, the igniter will glow an orange color and you will see this if you look thru the small viewing port. IF no glow, you could have a bad pressure switch, a bad ignition relay (found on the circuit board) or a bad igniter. OK so if the igniter glows, a few seconds later the gas valve should click open and send gas to the burners. The orange will turn to blue. If this does not happen, you have either a bad gas valve or bad circuit board. Finally if you get flame but it will not stay lit more than a few seconds, you may have a restriction in the burner gas train, a bad gas valve, a dirty or bad flame sensor or not enough gas pressure.
 
Knowing the sequence of operation will give you the needed information to talk with a service technician and cut down on diagnostic costs.
 
Try looking on the back of the furnace access panel for both model number and a diagnostic schematic. This will confirm what the flashing 3 code means for your unit.
 
Sorry, without knowing the model number, this is the best I can do for you. Good Luck!

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