Question about Heating & Cooling
You either have a bad fan relay or a bad tstat. Remove the t stat from the wall (as long as its not mercury), just the cover plate and see if the fan shuts off. If so, bad t stat. If not, bad relay
Posted on Dec 16, 2016
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Posted on Jan 02, 2017
The blower motor kicks on when there has been a 24 volt control failure.
This usually means that a limit switch has tripped.
Most likely that would be a high temp limit switch or a rollout switch.
First, make sure the filters are clean. and the evap coil is clean. If eaither are dirty/clogged, it will partially block airflow, causing the furnace to overheat, causing the high temp limit to trip.
A rollout switch typically trips for three reasons.
1 flame rollout into the burner compartment due to poor airflow.
2 overheating af teh metal plate the rollout is mounted to, due to dirty, old, rusted components.
3 a bad limit switch.
If your unit has an LED light, count the flashes and it will hepl popint out the problem.
(locate the wiring diagram/flash code list, and correspond the flash count, with the code.)
First, check filters.
Posted on Jan 14, 2009
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