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Goodman gmh95. The fan runs, cuts out, starts, cuts out as it nears set temperature.

We have a goodman gmh95, 1yr old. The fan runs, cuts out, starts, cuts out as it nears set temperature. Our heater was installed 2/25/11. The fan (blower) runs when the unit heats up. When the temp of the room approaches the temp of the thermostat, the blower starts to cut out (similar to an engine about ready to die) and starts up again. This can repeat itself several times until the room temp is met. This never happens when our heating contractor comes to check the unit. It also does not happen when he by passes the thermostat. We even moved the thermostat to another location...the problem still exist. Do you have any recommendations?

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Seen many bad blower motor modules. The motor is likely good the "brain," maybe not. Had a bad blower motor module on a Lennox that was actually causing the tstat to go into a time delay recently. The newer the machine the crazier things are becoming. If under warranty you'll likely get the motor and module together. This is where I'd start. Good Luck.

Posted on Apr 07, 2017

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Have you checked the diagnostic LED on the unit? Should be visible through the blower door.

Posted on Apr 07, 2017

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If that's a variable speed motor(?), I've seen them do some strange things. Not that scenario that you have though. If it's under a parts warranty, have your tech start changing some things out, motor, control board to start with. It appears that your thermostat may be loosing contact? I know he bypassed it but how? And was the bypass for a few minutes or so? Or that you're issue seems to occur after 5-15 mins of operation, and that just happens to be a long enough run time to closely reach the set temp. at the thermostat. And that getting close has nothing to do with it, but the 15 mins of runtime is a better description. So have your tech over, warn them it may take 2 hrs, and pay him to hang around a catch it acting up. And set your tstat to allow it to get cold inside so it will run a lot when he gets there. Also, when it acts up, turn your fans' AUTO/ON switch to on, and see if it qits acting up. Not sure what that will answer but it may help you tech, depending on how it's wired. Hope this helps!

Posted on Apr 07, 2017

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The sensor for the thermostat is probably going bad or has bad connections. It is (or thinks it is) heating up fast and therefore shuts of the heater.

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The flame sensor is not sensing flame. Inspect the system as it is tying to start and see if the flames are traveling to all burners and hitting the sensor. If not, clean the burner flame rail (the trough the allows the flame to travel from one burner to the next) or if it is hitting the sensor, clean the sensor with steel wool and check all connections from the sensor to the control board.

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open the front door to the furnace to access the controls there should be a red button try pushing it to reset

Posted on Oct 10, 2009

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