jack posted for all of us...

In the last several days my thermostat and furnance don't seem to be
""talking"" to each other properly.

It seems that when I leave my thermostat alone it activates the
furnance to go on when called upon. If I want to do a manual override
on the thermostat it doesnt activate the furnace at all.

The contact points on the control (in furnace) do seem greasy but is
that enough to have my heating system behave in this way?

Jack




Asked and answered MANY times - do your own research.
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Tekkie Don't bother to thank me, I do this as a public service.