Furnace Fan won't turn off, 2004 Alpha 40'
I am a new motorhome owner (8/2016). My furnace's blower would not turn off with the thermostat (blowing air, no heat) so I accessed the main switch through the outside panel to turn it off. Is the...
Forum Discussion
DrivingMissDaisy wrote:dougrainer wrote:DrivingMissDaisy wrote:
Your heater has entered "lock out" mode. this happens when during the start sequence, a flame is not established in 7 seconds. The blower will run until the thermostat is cycled off. Most common cause is flame sensor, try cleaning and adjusting first, then replace if necessary, it is not an expensive part.
True for OLDER furnaces. Depending on his year and model furnace, he probably has the current control board that shuts the Fan OFF when the flame sequence fails. The models that have this have the Fan relay ON the Ignition module. Doug
Ok, then it looks like it would be a faulty control board, probably a stuck relay. The only other thing that would run fan continuously would be a faulty on/auto fan switch in the thermostat and that's a long shot, I've never heard of that happening.
As I stated previously, NO wall tstat can control the furnace blower motor. Auto or ON. That feature is for the AC system ONLY. Doug
