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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 '+attachfiles'link at left of your send button.
I can mark it up with trouble shooting instructions.
We can go from there.
Tell me please what the service people quoted you for a complete repair.... I can tell a lot from that.
If the service people will guarantee a fix for under $250 that would be a decent enough deal.
Is Sears Home Maintenance offering to replace the system free? Or do that want money. Tell me two things please, how much money does sears want, and how old is the system.