Replaced the thermostat completely, brand new. It is a natural gas furnace and air conditioner combo. The fan will just cycle on at some time and stay on for like hours at a time, without any heating or cooling happening? Any ideas? This is getting expensive?
2007-07-03 11:12:14 · 3 answers · asked by John C 2 in Home & Garden ➔ Maintenance & Repairs
most likely problem is the fan relay is sticking in the on position and needs replaced....if it is an older furnace with a fan limit switch this will not be the problem as this only controls fan when heat is on....if it has a electronic control board then this needs replaced...
2007-07-03 15:05:10 · answer #1 · answered by Anonymous · 1⤊ 0⤋
With out knowing the age of the unit, it is kind of had to give you a good answer. If it is older, you could have to possible causes. 1. The fan limit is stuck on, or 2 the fan control relay is stuck closed. If it is a new furnace, and it has a circuit board, the on-board relays stick closed at times.
2007-07-03 12:26:11 · answer #2 · answered by Peter K 1 · 1⤊ 0⤋
Is your new thermostat a programmable type with a "cycle" feature? This will cycle the fan when the thermostat is not calling for heating/cooling.
2007-07-03 15:52:05 · answer #3 · answered by OrakTheBold 7 · 0⤊ 0⤋