Question about Goodman GMS90703BXA Heater

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If the pressure switch fails to close is this because of a bad switch or inducer fan motor? goodman model gmp100-4

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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

Jun 12, 2015 | Goodman Heating & Cooling

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could be one of a few diff issues. firstly, the air pressure switch may be failing. check to ensure the inducer motor is providing enough air flow for the air switch to close. if inducer motor isn't creating enough air flow the faults is within the motor. If the airflow is enough, then fault maybe the air switch. you also need to check for any blockage in the exhaust. ensure no debris is blocking the vent going to outside

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Janitrol furnace, Model # GMT090-3, built in February of '02. The induced draft motor runs for a half second, then quits. Indicator light blinks rapidly and continuously, indicating 'incorrect twinning'...


I ran into a simalar problem and it was a short in the control wiring of the furnace. When there is a call for heat a relay closes to start the inducer the movement of air causes by the inducer closes the air pressure switch. This is where the problem starts.some where in the control wiring there is a dead short this causes the secondary (24volts ) to drop causing the inducer relay to open shutiing off the inducer which in turn opens the pressure switch removing the short and the cycle starts over again. The culprit in my case was the high limit switch which was shorting against the metal furnace housing. You can easily ccheck this by removing the two wires from the fan limit switch and powering up the unit to see if the inducer runs normally . If it does remove limit and replace if necessary.
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Oct 10, 2013 | Goodman Heating & Cooling

1 Answer

Pressure switch goodman furnace 100-4 blinks three times, installed new switch still wont start.Also does inducer motor start before gas fires??


2nd question first here: Yes, inducer motor (exhaust fan) must run before gas an fire.
MY FOLLOWING ANSWER WAS COPIED OVER FROM YOUR OTHER POST...
I'm going to assume you can operate and understand a VOM, as well as being able to observe the proper safety procedures for performing service work.

In the case of a control board returning an error code for a failing pressure switch, but the pressure switch actually checks out OK, try this:

Test your exhaust fan power leads for power coming in from the board during the first few seconds at the start of the heating cycle. If power is not showing up there, there is likely another circuit malfunctioning somewhere preventing startup. However, if power is showing up there, then deactivate the system and disconnect the exhaust fan power supply leads from the motor. Test the motor's coil for continuity - a failed exhaust motor coil will result in no vacuum for the pressure switch, hence no heating cycle allowed by the control board.


In my case, the exhaust fan actually failed due to a broken coil lead at the binding post to the push-on connector. I was able to repair the coil lead myself - at no cost - hurray!

Oct 20, 2011 | Goodman GMS90703BXA Heater

1 Answer

Model a36-15 - heat should be on but as the unit goes on and off sometimes the air blowing is warm and sometimes not which then takes numerous on/off to reset


This furnace has an induced draft motor and a pressure switch that has a tube that atttaches to the induced draft housing where it can sense the pressure or vacuum of the inducer motors running, thus proving to the system a induced draft exists with a purge period followed by a trial period for ignition, (either spark or hot surface ignitor) if the pilot is established another type of flame sensing device peoves a pikot flame exists allowing the main burners to run.

the pressure switch , its tubing and the orifices the tube attaches to piug with carbon or collet moisture if the tubes routed with a dip where condensate c an build and eventually block the ability of the presssure switch to sense the indicers operating, it can fail to close or waver open and closed back and forth as yours may be.

Dec 27, 2010 | Goodman Heating & Cooling

1 Answer

My furnace isnt working the trouble light code says pressure switch stuck open or closed


The pressure switch, open or closed depends on the induce fan motor. the switch could of failed. Try blowing into it, in and out. And or your induce fan motor is not blowing out the excessive heat out of the furnace properly. We provide repairs in the So Cal Area.

Oct 07, 2010 | Heating & Cooling

1 Answer

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either the pressure switch is not closing (probably clogged) or the ignitor is bad.


Verify that 24 v is coming out of the pressure switch, after the draft inducer motor comes on, then look for the ignitor to glow.
Do you see the glow from the ignitor? If not, replace it.

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1 Answer

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2 Answers

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


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5 Answers

Goodman furnace I think


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!

Oct 28, 2007 | Goodman GMS90703BXA Heater

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