Question about Goodman GMS90703BXA Heater

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Heater sounds like it will start then shuts off

When I tun the heater on, there is a delay before it starts firing up the heat & fan part, then it shuts off and restarts over and over again.

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  • carno Feb 17, 2009

    My Goodman furnace is sporadic in its cycles. Starts, then runs then the cold air comes and lasts forever sometimes and then other times that cycle is short. It starts when the temp is already at the desired temp. Nothing consistent about the cycles! Sometimes it starts, seems like it's going normally then it'll shut off and 2 seconds later start right back up again. It's really costing me on my utility bill too with all the starting and stopping!

  • mammadukesnj Feb 23, 2009

    Detects need for heat, starts the cycle, pilot lights, gas starts, flame comes on and then it shuts down. I've called Goodman because it is still under warranty, they were so nice. She kept me on the phone and found a serviceman to come out. My suggestion is if your unit is still under warranty you should call Goodman first before doing any maintenance yourself because it can void your warranty. I'm on the phone with them now to schedule a repair. I hope they show up soon because I'm freezing!!

  • Anonymous Feb 28, 2009

    This has happened 2 times in less than a year for me and my landlord sucks. I think these are just cheap pieces of ****. Mad as hell when my family is sitting here freezing.

  • Don Berry May 11, 2010

    Does the flames come on before it shuts off?

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There is a little rod that sits in front of one of the flames called a flame sensor/detector, after a few years corrosion can build up on it. There is a little screw you take out then removed the rod, clean it with sandpaper (very fine) and then put it back. If corrosion is built up on this, it cannot detect the flame..this was my problem and it was easily fixable.

Posted on Feb 24, 2009

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Sounds like a dirty flame censor to me

Posted on Feb 24, 2009

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On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the ignitor. The ignitor will glow and you will be able to see it if viewed thru the small inspection port. Once the ignitor gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the ignitor does not energize (bad control, bad ignitor), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not lite (dirty pilot), the burner does not lite (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Most newer furnaces will have a diagnostic center or control built into the control module. You may be able to view it as it is running thru a small viewing port. Some models will require the removal of an access panel prior to finding it. On the reverse of the access panel, there will be a diagnostic chart that will aide you in understanding any error code recorded (usually a blinking light).

Posted on Feb 18, 2009

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When heat turned on it trips out


Heaters tend to have safety features to make sure they don't start fires. Depending on the particulars of your heater, some things to consider:
  1. Most heaters have a tip sensor, so that they'll turn off if they are tipped over. If it's tipped right now, put it level and see if that helps. you might also try tipping it (while unplugged) through a wide range of angles, see if you can hear a switch engaging/disengaging, or something like a pendulum making contact with a wall. If that switch is stuck or mis-aligned, that may be the issue.
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  4. Heater usually has some sort of thermostat, or level-of-heat setting. if this sensor is defective, it may think that the system is too hot, and shut the system off. Many systems like this will be rigged to shut off if the sensor fails or goes open circuit, so that a defective or broken temp sensor doesn't just register as 'really cold, ramp up the heat power' and cause a fire.
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