Mr Heater Big Buddy Fan Not Working [7 Easy Solutions]

Your heater can malfunction because of a clogged air filter, cool down face is running, loose or incorrect wiring, broken temperature gauge, broken blower switch, condensation in the pressure switch tube, and bad fan motor.

mr heater big buddy fan not working

Read our simple guide to fix your Mr. Heater Big Buddy fan not working.

Mr Heater Big Buddy Fan Not Working [7 Easy Solutions]

In this section, we’ll look over the simple solutions for common reasons behind Mr. Heater Big Buddy fan not working.

1. Clogged Air Filter

The filter can become so clogged that no air can pass through it. The fan may appear to be turned off, but closer inspection reveals that it is operational.

However, the dirt is preventing hot air from being blown out. This is a serious issue as overheating can cause damage to your unit.


To allow hot air to pass, you’ll need to clean the filter. Turn the heater off and look for the filter. Before washing your filter with a garden hose, make sure it has a plastic frame, which indicates that it is reusable.

There are no special cleaning materials required. Water will suffice. Dry the filter entirely before reinstalling it.

It is a good idea to keep the filter as clean as possible. Cleaning the filter 2 to 3 times a year, depending on the pace of dirt build-up in your home, should suffice.

Note: You can also read how to fix Mr Heater Big Maxx Fan Keeps Running

2. Cool-Down Cycle

This is a regular part of your heater’s operation. When your heater is on the cool-down cycle, it will blow cold air instead of hot.

Depending on the temperature setting, it can last for several minutes. This feature protects your heater from overheating and extends its life.


There isn’t a problem to be solved here. After the cool-down cycle is completed, your fan will resume normal operation. All you have to do now is sit and wait.

3. Loose or Incorrect wiring

Loose or damaged wires can cause your Mr. Heater fan to not run. You may have incorrectly wired your blower which too will cause this issue.


Inspect the venter motor terminals and the burner relay connections if the system is getting power but the fan and venter motor are still not operating.

Make any necessary repairs if any of these are broken or damaged, and the machine will function normally. Check the heater manual for the wiring diagram of your unit. Use it for cross-referencing.

4. Broken Temperature Gauge

The internal temperature of the heater is displayed on the temperature gauge. You’ll get the wrong temperature reading if there’s a problem with it. This could be the source of your blower’s failure.


A new temperature sensor or thermostat may be required to repair a broken temperature gauge. If you’re not comfortable working with electrical appliances, have a certified electrician take a look.

But the process can be fairly simple. Check out this video to see how to do it.

5. Broken Blower Switch

Your fan heater may not be blowing hot air due to a faulty blower switch. Examine the switch to see if it has melted anywhere.


If a switch replacement for your blower fan model is available on the market, replace the blower switch. Just google “Big Buddy heater fan switch” and you’ll find the available switches online.

6. Condensation In Pressure Switch Tube

After detecting that the blower is working, the combustion air pressure switch turns on the ignition controller.

As a result of a clogged pressure switch tube or condensation tube, the heater will not produce any heat while the fan continues to spin nonstop.


The pressure switch on your heater will give you an error code indicating that it is closed. That means you have a build-up of condensation in your pressure switch tube. You’ll have to extract it from the pressure switch tube.

7. Bad Fan Motor

A defective fan motor can be the reason why your Mr. Heater Big Buddy Fan isn’t working.


You’ll need to hire a professional to repair the heater blower or replace the old one with a new one.


Why does my Mr. Heater Big Buddy not have a fan?

Mr. Heater has removed the fan from several models of the Mr. Heater Big Buddy due to recent regulatory adjustments to import duties.

Can you sleep with a propane heater on?

It can be hazardous to you and your family’s health to do so. More than half of all fires caused by space heaters begin this way. When utilizing a vent-free propane space heater while sleeping, you run the risk of carbon monoxide (CO) poisoning.

How long will 20lb propane last Mr heater?

When the specified temperature (60°) is reached, the heater will turn off. If the heater is left on all the time, it will burn through a whole 20-pound tank in 35-40 hours.

How much ventilation does a Mr. Buddy heater need?

For every 1000 BTUs of heat generated, 1 square inch of ventilation is required. Our Unit, Garage/Shop, and Forced Air Propane heaters are among the products in this category.

Is it safe to use a Mr. Buddy heater in a tent?

A portable Mr. Heater Buddy Tent Heater is ideal for keeping your tent or enclosed shelter warm in cold because of the inbuilt safety features like the Oxygen Depletion Sensor (ODS) and unintentional tip-over shut-off.


Hopefully, you now know everything you need to in order for you to start cracking at your Mr. Heater Big Buddy fan. In case you have any questions regarding your Mr. Heater Big Buddy heater, leave us a comment below. We’d love to help you out.

About William

William is the founder of He has real life practical skills in fixing smoker & heating appliance issues. He loves to share his knowledge & helps others in fixing their appliances & saving their money. William firmly believes that anyone can repair his or her unit with the correct guidance & knowledge. See more at about us.

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