I have a Goodman GDS80904BNA and the glow plug lights up, and it kicks on, but then shuts off, fan/blower works fine but no heat
If the hot surface ignitor comes on and fires the burners, and then shuts back down, you need to take a look at the flame sensor. It is a ceramic rod with a metal tip that rests in the pilot flame. When heated from burners, it sends a signal to the main control module, circuit board, which ever this unit is equipped with to keep the burners on. It is a safety to shut the burners down if there is a problem. Take some fine steel wool to clean the metal tip on this and this should take care of the problem. If this does not do it, then 99% of the time you have a faulty control board or module. It will have to be replaced.It is where this flame sensor connects.It will continue to drop out of the circuit, and the fan will start and run. You're T-stat is good or the Hot Surface ignitor would not glow. You will need to take as much info you can from the unit, Goodman and the control, all numbers with you.You can purchase this part at a appliance parts house, or air conditioning parts house. Please keep me informed, I would like to hear back from you. I hope this has given you some direction to follow.Good Luck,
Shastalaker7
Hi, Just wanted to add, that if this furnace has the hole in the panel with led lights, it should be flashing a certain amount of times indicating what could also be you're problem.If so, remove this panel and you will have a chart showing you the different codes per flashes, leading you in the right direction.Such as, inducer motor, pressure switch, flame roll out, faulty module, ect. Please let me know for more assistance.Sincerely,
Shastalaker7
PS This depends on the year of the furnace also.
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Check the flame sensor if the flame sensor is dirty or bad it will not sense that the burners came on and shut the burners down.
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