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I need the unit brand and model number... it is generally on a sticker glued onto a side wall in the same compartment as the gas valve is in.
Next please attach a well focused, close up photo of the wiring diagram glued inside the service panel, the picture needs to be taken from straight on, in very good light.
You can use the paper clip- icon at the right end of the tool bar at the top of this dialog box to attach it here.,Include a picture of the thermostat wire connections to the printed circuit board in the same area.
If you have an error code showing, tell me what the code read out is on the wiring diagram or a sticker next to the diagram please.
If there is no paper clip-icon, look for the '+attach files'link at left of your send button.
I can mark it up with trouble shooting instructions.
We can go from there.
That brand and model number does not come up in any of my files.
If you can attach a wiring diagram per the previous instructions that will work.