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Problem: Furnace would come on and shut off and then the heat would not come back on a second time

Hello Mr. Arnold i have a question, i am working on my mothers heater, a few days ago the heater would come on and shut off and then the heat would not come back on a second time. The first time i checked it t-stat called for heat, inducer came on but no ignitor glow so i took two wires going to i believe its a high limit thermostat switch coming from the board and jumped them and heard a click by the gas valve and the ignitor came on and then it worked came on and shut off a few times then it stopped. when heater is off for a while and i turn it on t-stat call for heat, the inducer comes on, ignitor glows but no heat. so i jumped those same wires again and now the ignitor doesn’t glow it will glow only after heater has been off for a while what could be the problem? any suggestions would help thank you. the unit is a package Goodman model # pg8060100-1.

 

I am not familiar with this Goodman furnace model so I’m probably not going to be much help. This sounds like your furnace might be going off on high limit or in another safety device like a rollout switch or pressure switch. I would suggest that when you are having problems to get a volt meter, set it to “Volts AC” and test each of your safety controls (pressure switch, rollout switches and limit switch) to see if they are all closed. With the furnace calling for heat you can touch with your meter probe from each terminal to ground and see it they are all getting 24 to 28 volts through the controls. So you would take the meter and touch one probe on the terminal (of the control) and the other probe to a ground (body of furnace). If it isn’t getting 24 volts through each of the terminals then either the control is bad, your heater is over-heating, or you have a cracked heat exchanger (if it is a rollout or limit). If it is a pressure switch then either the pressure switch is bad or your vent or drain is stopped up (if you have a condensing furnace). Also make sure you check all your wiring to make sure all wires and connections are tight. Especially pay close attention to the ground wire coming off the transformer and make sure it is connected tight. We have YouTube videos below made by grayfurnaceman that show how to test a limit switch and a limit switch. Thanks grayfurnaceman for these informative videos!  Best of luck in finding the problem. If you have any questions please feel free to email us at: arnoldservice@gmail.com or add comments near the bottom of this page. We will be happy to try and answer any of your questions.

2 thoughts on “Problem: Furnace would come on and shut off and then the heat would not come back on a second time

  1. Hi,
    I installed a new flame sensor and a igniter on our rheem model RGDG-05EAUER and still not fire up.
    What should the OL readinfg be on the igniter?
    Before I replaced the two items above I The first time it did not fire up I cleaned flame sensor and it worked about a day and a half. checked it out again and this time the igniter came on and then shut off about 30 or 40 seconds with no flame. About 4 years ago we had the controller board changed out.
    Any ideas on what to do next.

    1. Hi Butch! A good ignitor should read between 40 and 90 ohms. I would like to suggest that you try and test the ignitor relay with the ignitor plugged in to see if the control board is supplying 110 volts AC to the ignitor when the ignitor is supposed to be glowing. If the ignitor is not getting 110 volts then you might have a control board problem or a pressure switch or safety switch (limit, rollouts) that is causing the problem. Make sure that your pressure switch, rollouts, and limit are staying closed aways. If you want me to look it up and tell you which control board your furnace uses then I will need your furnaces serial number as well as the model number. Please send the model and serial number to our email address arnoldservice@gmail.com if you want me to look up the control board part number. I hope you find an easy fix. Steve

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