Keep in mind that a lot of these control boards are not always designed
the way one might initially guess. And that there is no returning
electical stuff. Even though you might figure it out if you buy a few
unnecessary parts along the way you will have spent as much as calling
a service guy anyway. On the other hand you will know a lot more about
how it works when you finish. You could decide the learning experience
is worth it.
Why stop now? Replace the thermostat. It's almost always the
thermostat. You'll need to replace the low voltage thermostat wiring
too. The new wiring has to be matched to the new stat or the electrons
will get all confused and produce fault codes.
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