This morning I went to turn up thermostat and the digital readout was fading, lots of dashes here and there, but no readable numbers. Backlight was on at this time. Changed alkaline AA batteries correctly and replaced faceplate. Now no backlight and no digital numbers. Changed to another set of new batteries. Still same problem. The heat is running, but does not stop when room is hot.
Turn the Furnace off, Disconnect the R and W thermostat wire from the control board located usually in lower compartment of furnace, the blower
is usually mounted behind it.
Make sure the 2 wires you disconnect are going to
R(usually power) and W(usually Heat) other terminal
markings are y(for cool) g(for fan). After Disconnecting the R and W wires Turn the furnace
back on. You will probably have to hold a door switch
in to complete the circuit. If everything is correct the
furnace should not run.
This is more than likely that you have the R and W
wires touching eachother and you need to get them seperated.
Testimonial: "Grear answer. Saved a lot of time and money. Had to pull out furnace manuel and went from there. Thank you and Happy 2010 "
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