My thermostat will not send a call for heat. The thermostat says says
heating but it is not running. If I turn the temp down and then back up
the furnace kicks on.
Same thing for me. Flashing red light on furnace. I changed the limit
switch on the furnace but same thing is happening. I turn the temp down
and back up on the nest thermostat and the furnace comes on. No idea
what is happening.