RV Furnace Blower Won’t Start [4 Issues and Solutions]

Recreational vehicle trips shouldn’t be restricted to the warmer months. Take advantage of RV travel at any time of year.

But what would you do if your RV’s furnace broke down in the dead of winter? Yes, it sounds like a very terrible ordeal when your RV Furnace Blower won’t start.

Worry not, even if you are now experiencing it. When the blower on your RV furnace doesn’t turn on, go no further than our comprehensive guide.

More importantly, we’ll explain why the blower on your RV furnace isn’t functioning and how to repair it as we go along. This should protect you from the harshness of winter.

To enhance the experience, read this while enjoying a warm drink. The cool weather will clear your head and help you concentrate. Let’s get down to business straight now.

Stuff You’ll Have to Have

Before you begin making repairs, you’ll need the following materials:

Equipment: Voltmeter; Extra 12V Battery; Phillips Screwdriver; Swiss Army Knife; Extra AAA or AA Batteries

Why Won’t My RV’s Blower Light Turn On?

What sort of RV Furnace you have will determine the solution. For instance, if you have a gas furnace or a wall heater, the issue is more likely to be electrical.

The onboard battery should be checked before proceeding to a new location. In addition, this is not the only issue of its kind.

Listed here are some of the most often encountered causes of a non-functioning RV furnace blower, compiled for your convenience.

You may find them below:

  1. First, an insufficient power source.
  2. Complications with the Wiring
  3. Corrosion of Batteries
  4.  Wires that have been damaged
  5. Faulty Temperature Control

Next, we’ll discuss the issues, the causes for them, and potential remedies. To begin, let’s address the small electrical faults that have been brought up before.

First Issue: Power Shortage

Initially, we will discuss the issue of insufficient electrical power. This is the most common reason why the fan won’t turn on.

The standard RV heater blower requires 8 amp hours of electricity. The blower will not work if the onboard battery is dead or malfunctioning.

And what else occurs if electricity is insufficient?

The thermostat, the main control for the heating and cooling system, will malfunction. Which leads to the blower in your RV furnace breaking out in the end.

This should be the first thing you look into. Circuit breakers might have tripped, which would explain the problem. Because of this, you should double-check everything.


Bring back the voltmeter we mentioned. Proceed by powering it on while set to DC voltage. As soon as you’ve done so, connect the positive terminal with the red wire and the negative with the black wire.

The screen should display a reading. For your convenience, we have included a table below to explain how to properly read your battery.

Battery TypeIdeal Reading
6 V6.25V – 6.35V
12 V12.5V – 12.7V


If your battery’s percentage drops below the optimum range, you should charge it. However, if there is absolutely no reading, the battery is dead. Substitute something else.

In the instance of a tripped circuit breaker, the solution is as simple as resetting the switches.

Let’s try our hands at addressing the next issue that comes up.

Second Issue: Wire Problems

See whether the batteries are providing enough power when you’ve finished inspecting them. Inspect the wires for breaks or any that may have come loose. You should start by following the wires.


Keeping track of all the cables will be a frantic process, so be patient. Additional possibilities are overload, a short circuit, or a ruined outer layer.


After a thorough investigation, if defective wiring is found, it should be swapped out with new.

Third Issue: Corrosion of the battery

Battery corrosion is a common cause of battery failure. When fluid from the battery seeps out and begins to corrode the terminals, this is what occurs.


In order to locate the issue, check the battery connections for the abnormal accumulation of any white, gray, or greenish substance. In other words, after you’ve recognized the problem, you may start working on a solution.


Corrosion of batteries may be prevented in 5 simple methods. You may find them below:

  • Initiate by combining baking soda with water.
  • To begin, locate the corroded terminals and then detach the wires from them. It’s important to use extreme caution.
  • Scrub the terminal with the baking soda and water solution to remove the rust.
  • Fourth, dry the terminal with a clean paper towel.
  • Fifth, reconnect the wires to the thermostat and heating system after checking the terminals.

Following this, we’ll discuss the faulty thermostat, the last issue on our list.

Fourth Issue: Faulty Temperature Control

Managing the temperature in a room is all in the head, thanks to the thermostat. As a result, likely, your RV furnace blower won’t function if a single part stops working.

You must inspect the thermostat for frayed wires and other signs of malfunction.


Let’s get started with the screen. We have an issue if it isn’t displaying any information or flashing.

In such a scenario, you should take apart the panel and inspect the wiring for any signs of fraying or broken connections. If your thermostat runs on batteries, you should inspect the cells.

Now let’s talk about how to fix the issues we unearth.


Start by tightening any dangling cables and reconnecting those that aren’t working properly. If the batteries are dead, replace them. When you’re through making adjustments, just replace the screen’s screws.


When your RV Furnace Blower won’t start and get switched on in the middle of winter, we know how terrible it may feel. For this reason, we made this troubleshooting guide.

Now, if you see that fixing it is beyond your abilities, you should contact an electrician. Stick it out for a few days in the cold, but don’t take any chances.

We are eagerly looking forward to hearing from you. Drop a line in the discussion and let us know what you think.

Maintain a high standard of caution till then.