So when the switch is working correctly your furnace fan should turn on several minutes after thermostat calls for heat and turn off several minutes after the heat cycle ends.
Why wont my attic fan shut off.
Here s why attic fans are seldom the most efficient way to vent an attic.
Why your furnace won t turn off.
The only way to get that pesky fan to stop running is to shut it off at the breaker or the emergency shut off switch.
Wait to see if the air conditioning unit fan eventually shuts off.
My furnace fan in my house won t turn off when my unit is off on 2019 12 28 by mod jamie perhaps there is a defective fan limit control or fan relay control switch.
You tried turning the thermostat to the off position nothing works.
The fan limit switch is responsible for turning the blower on and off at the appropriate times.
You ve checked the obvious.
Pull the cover off the thermostat then remove the mounting screws holding the thermostat to the sub plate and pull the thermostat off.
If the unit continues to run it may be the thermostat.
A switch to shut it off is a good option.
Why won t your hvac fan turn off.
However it may be on a dedicated circuit so you can shut it off in your circuit breaker box.
The fan switch on the thermostat is in the auto position not the on position.
It is important to note that there are a variety of reasons that your furnace won t turn off many of which are outside of your control.
If the fan stops running the thermostat is the problem and should be replaced.
If the fan continues to run make sure the wires are secure and not touching.
The problem is that they will pull air not only from the attic but also from your house where they ll steal air conditioned or in your case even heated air making it most costly to heat or cool your living space.
If an inside air conditioning fan unit will not shut off there are a few remedies.
Sometimes my blower fan won t shut off for a while.
So your indoor fan never stops running.
Replace the thermostat and its cover.
You could either go up to the attic and check if the fan has a switch.
On 2019 12 28 by jamie.
Your hvac fan should turn on and off with the rest of your heating and cooling system.
Still if it is installed properly it should turn off by itself once the air temperature cools to an acceptable temperature.
If the fan in the attic does not have a switch you will have to turn off the circuit breaker that controls the fan in the attic.
Indoor fan won t shut off unless i use the circuit breaker.
If it does the problem is not likely the thermostat.
For all of you who are struggling with that question how to turn off the attic fan there are two ways to do this.
This article is a little different and is less common than the other problems.
It may be a bad thermocouple but in any case the fan does not know when to shut off.
It s normal for the fan to kick on a couple of minutes before heating starts or to stay on for a couple of minutes after cooling stops but your fan shouldn t run for hours on its own.
