Why does my heater fan keep running?
When your thermostat is set to AUTO, your furnace fan should blow only when your furnace is in the middle of a heating cycle. But if your fan runs constantly, regardless of whether your furnace is heating, that’s not normal. There’s a shorted thermostat wire. There’s a shorted wire at the fan limit switch.
Why does my gas furnace fan keep running?
The Furnace Filter is Dirty If the filter is dirty, it restricts airflow across the heat exchanger, which causes it to overheat! The furnace goes into “cool down” mode and runs the fan constantly. Your furnace might even start blowing cold air if this is the problem. The solution is simple: replace the furnace filter.
Should the fan on my furnace be running constantly?
Running your furnace fan all the time isn’t exactly a bad thing. In fact, there’s no need to worry about the fan wearing out or breaking down because it’s designed to run continuously, and there’s an array of benefits connected to this. Here are some of them: Better circulation of heated and cooled air.
Why is my fan running when my thermostat is off?
Over time, relay switches can become stuck or damaged, preventing the thermostat from communicating with the fan. Essentially, this means that the fan isn’t receiving the commands you’re relaying to the thermostat. So even if you turn your AC off, the fan will continue to run.
Why is my furnace fan not turning off?
If your furnace fan won’t turn off, you most likely have one of these 3 problems: Your furnace fan limit switch is set to “manual override” The fan limit switch is faulty and needs to be replaced. There’s a problem in your thermostat wiring.
Why will my heater not turn off?
There are a couple potential reasons why your heating system won’t turn off: Bad thermostat: A faulty thermostat can normally be repaired. Faulty wiring, a broken switch, or broken heating sensor can be fixed depending on how severe the issue is.
Why won’t my furnace shut off?
If your furnace won’t shut off, you likely have one of the following problems: Incorrect setting on thermostat. Dirty air filter. Broken blower fan motor.
How much does a fan limit switch cost?
You will need to buy a high limit switch that is produced by the same manufacturer as your furnace unit. Depending on who your OEM is, this component could roughly cost you anywhere from $4 to $25.
How do you reset a furnace fan?
How to Find and Reset your Furnace Motor Blower
- Step 1: Turn off the power to the furnace.
- Step 2: Remove the blower compartment cover.
- Step 3: Make sure the blower is completely cooled off.
- Step 4: Locate the reset button.
- Step 5: Press the button in (assuming that this is your issue and that the button has popped).
Why won’t my gas furnace shut off?
Why is my heating still on when it’s turned off?
A check valve is used to stop the natural convection from warming up your home when your heating is switched off. If the check valve is broken or blocked, heat will rise through your system causing your radiators to stay hot. Once again, contact a qualified professional to come and check what the problem is.
Why is my furnace blowing air when off?
Your Dirty Air Filter is Causing the Furnace to Blow Cold Air. It sounds too easy to be true, but if your filter is dirty, it won’t allow air to pass through it. When this happens, even when the fire is off, the blower will continue to blow air through your house, but there’s nothing heating it.