When your thermostat is set to Car, your furnace sports fan should blow only when your furnace is in the middle of a heating hertz. But if your fan runs constantly, regardless of whether your furnace is heating, that's not normal.
So, what's causing it to run continuously? Well, if your furnace blower rooter won't stop running, you could have any of the following problems:
- You're using the wrong thermostat fan mise en scene
- Your fan limit replacement is on "manual overthrow"
- At that place's a shorted thermostat wire
- On that point's a shorted wire at the lover limit tack
We jazz. That's a lot of possible problems. But don't worry, we'll walk you through and through some troubleshooting stairs thusly that you can pinpoint your issue. We'll as wel allow you know when you'll need a professional to clear the problem.
Live in the Genus Phoenix sphere and need a tech instantly? Just contact us and we'll send a professional over immediately.
Introductory, check your thermostat settings
First sour, let's confirm that your thermoregulator is set correctly and ISN't calling for continuous heat or forcing the fan to bungle not-stop. Follow these troubleshooting steps to doh that.
1. Set your thermostat to a temperature that's take down than the actual way temperature. This shuts the furnace down and prevents your thermostat from calling for more heat. If the furnace was in the mid of a heating rhythm, wait 3 to 4 proceedings for the blower fan to stop spurting.
Did your furnace fan stop blowing? If so, it's probably that you've set your set temperature too commanding, causing your furnace to heat continuously as it tries to reach that temperature. Other issue that could reason your furnace to heat constantly is a house that isn't weatherized properly, allowing cold air out to enter the home as hot air escapes.
If your furnace continues to heat constantly but can't arrive at your set temperature, have a professional inspect your system and home and provide imaginable solutions.
If your furnace fan is still blowing, continue onto step 2…
2. Make a point your fan is set to Machine and not ON. If your fan is set to ON, information technology will tally continuously, disregardless of whether your furnace is heating Oregon non. Tip: Avoid setting your fan to ON, it wastes money because it forces the fan motor to run perpetually.
If your furnace fan is set to AUTO and is still running, then move along to the next section.
Second, troubleshoot for lover limit change problems
Your fan limit switch is located directly under your furnace hood and controls when your furnace blower turns on and off. A probe internal the switch monitors the temperature of the burner assemblage to grow the lover on once the burners are hot and turns the fan off once the burners cool devour (when the thermostat stops career for heating system).
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But if your furnace rooter won't plosive speech sound running, 2 problems you might have with your furnace winnow limit switch include:
- The switch has been set to manual overthrow
- The switch is defective and needs to beryllium rewired or replaced
Follow these troubleshooting steps to see which of the above is your job:
1. Locate your lover limit electrical switch and check to see if the albescent node (ascertain pic to a lower place) is pressed in. If so, your switch is set to manual override, or "forever running" mode.
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2. Pull the covered button out to reset your fan demarcation line swop to AUTO. This testament lawsuit the fan to automatically turn on when the furnace is heating and shut off once the call for fire u stops.
If your buff limit switch was already set to AUTO (not pressed in), then you most likely either have a problem with your thermostat wiring operating room the winnow limit switch is bad. Unfortunately, you'll need a professional to fix both of these problems.
Want help from a Phoenix tech?
If your furnace lover is even running not-stop, we bathroom help.
Just contact us and we'll send over an experienced Genus Phoenix tech who stern fix your furnace sports fan problems!
Related reading:
- Top 3 Furnace Problems in Genus Phoenix, AZ
- Furnace Won't Trip out? An AZ Tech Explains
Trane Electric Furnace Emergency Heat Fan Only Blows at Low Speed
Source: https://patrickrileyservices.com/help-guides/why-does-my-furnace-fan-keep-running
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