If you notice that your furnace blower is turning off and on when it shouldn't, you'll want to have that curbed as soon as possible. Not only does this decrease your comfort, it can damage your furnace.
So what's causing this? Well, IT depends on your situation.
Is your blower turning on/turned perpetually during a heating plant cycle? If so, it's most likely caused by
- Beggarly canal design
- Abnormally cold temperatures entry the rut exchanger
- Abnormally hot temperatures in the rut exchanger
Is your cetacean turn on/off when your furnace isn't heating? If so, IT's most likely caused by a bad fan limit switch.
We'll go over what you can do on your own to puzzle out your trouble and when you'll need a professional.
Merely first, let's engage a quick look at how your furnace cetacean whole kit in normal operation to see whether you actually own a problem or non.
How your furnace blower unremarkably full treatmen
In normal operation, your furnace blower fan should come on 1.5 to 3 minutes after your thermostat calls for heating plant and should turn out several minutes after the heating cycle ends.
Your blower should run constantly until the heating cycle ends.
When your furnace ISN't really heating plant, though, your furnace blower shouldn't be running the least bit.
So, if your blower is turning on/remove during a heating cycle or after the postulate heat stops, you have a problem.
Now, let's consider what's causation your cetacean to "misbehave" in some of these situations…
If your blower is constantly turning on/off during a heat cycles/second…
...you have one of these 4 problems:
- Ductwork that is leaky or designed poorly
- A furnace that is oversized for the home
- Abnormally rock-bottom temperatures in the heat exchanger
- Abnormally high-level temperatures in the heat exchanger
So, what can you do to stop your blower from constantly turning on and off during a heat cycle?
Unfortunately, you'll need a professional to solve nearly of the problems listed above. Simply before you call in a professional, two things you can do to prove and solve the trouble are:
1. Tick for a dirty air filter and replace if required. A clogged filter limits the amount of unqualified gentle wind that passes over the heat exchanger, causation IT to overheat and shut soured. At the same time, your cetacean mammal turns along to help cool it down. As soon as the heat exchanger cools down, though, the burners turn back on (because the thermoregulator is noneffervescent vocation for heat) and the process repeats.
So, if your air filter looks like the unrivaled to the right, replace it immediately and visualize if that fixes the problem.
2. Check for a dirty air handler blower fan. Similar to a choked filter, dirt happening the blades of the air handler fan volition decrement cold flow of air terminated the fire u exchangers, resulting in the same blower connected/blower off pattern. So, if your air coach looks like the one below, examine wiping the blades with kid gloves with a dry towel operating theater soup-strainer.
If you'atomic number 75 still noticing that your blower turns off and on constantly during a heat cycle, you'll need to receive a line of work inspect your unit to bump the problem and correct it.
If your blower is constantly turning on/hit when the furnace isn't heating…
...you most likely have a high-risk fan limit switch.
Your furnace fan limit switch is basically a control system that determines when the furnace blower fabrication should turn off and on. The system uses a "temperature dig into" to detect temperature changes inside the heat exchanger (find image below) and turns your blower on and off in reaction.
But since temperatures inside the heat exchanger should stay comparatively stable when the furnace burners aren't connected, your blower fan shouldn't be needed in the least.
So if your furnace blower is turn on and off when the furnace isn't in a heating plant cycle, it usually means the buff limit switch is nonfunctional.
Unless you'Ra familiar with the components of your lover limit electric switch and how information technology industrial plant, we suggest letting a professional repair surgery replace the switch.
Need help from a MN tech?
If you're not sure why your furnace cetacean mammal is cycling happening and off when it shouldn't be, we're here to help.
If you in play in the Minneapolis-St. Paul area, schedule your appointment with MSP today.
We'll send away a tech over immediately to take a look into at your system and fix the problem in no time.
Would a Bad Heat Exchanger Cause My Fan to Run Constantly
Source: https://mspplumbingheatingair.com/blog/why-does-my-furnace-blower-turn-on-and-off-constantly
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