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Please help!!! Fan running continuously

Fan continuously runs in all modes unless breaker is flipped. Replaced relay and thermostat. Brand new thermostat caught FIRE on the wall at 3 am two days ago. Put old thermostat back on wall and must use breaker to shut off (both new-now burnt-and old thermostats needed breaker to shut off fan). Needless to say we are TERRIFIED to run furnace. What could be the problem keeping fan on continuously? Note: We honestly believe the new thermostat that caught fire was defective.

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A lot of furnace control boards turn on your fan run in the event of a blown fuse or lost control device to be sure tgere is air accross the heat exchange. If you correct what ever caused the stat problem. Check your 3 amp fuse on control board you will find it blown?
Hope this helps. Please contact a certified hvac person. Your dealing with your safety

Posted on Jan 05, 2015

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Sounds like its wired up wrong

Posted on Feb 11, 2012

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