Dometic RV Furnace Troubleshooting: Fixing Common Problems Made Easy

Alex Ortiz
By Alex Ortiz 11 Min Read
11 Min Read
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Hey there! 🌨️ Imagine driving in winter. It’s super chilly outside, and you’re relying on your furnace to keep you warm and cozy. It’s like having a mini-sun inside your vehicle, even when it’s freezing outside! But, what if one day your trusty Dometic furnace decides to take a day off? Yikes! That’s not fun.

But don’t worry too much! There are ways to figure out what’s wrong and fix it. It’s like playing detective, but with your furnace. 🕵️

You know there are several parts to your furnace that might be causing the hiccup, right? There’s the propane tank, the thermostat, and even little things like the battery or the sail switch. And don’t even get me started on the ignitor, gas valve, and circuit board!

But here’s the thing: you’ve got to be a bit strategic about checking each part. Think of it like solving a puzzle. You wouldn’t start in the middle of a jigsaw puzzle, would you? Similarly, you shouldn’t just randomly check the thermostat before the blower fan. There’s a right order to these things!

Anyway, I’ve had my share of furnace mysteries with my Dometic RV furnace. And trust me, it’s quite the adventure! Want to hear about it?

What Are the Essential Components of the Domatic RV Furnace?

Before we dive deep into how to fix your furnace, let’s take a step back. 🤔 If we’re going on this troubleshooting adventure together, it’s super important you know your furnace inside and out. It’s kinda like getting to know the ingredients before you cook a recipe.

The Heart of the Furnace: Inside Components

Okay, so imagine your Dometic RV furnace is like a little city. Inside that city (or furnace), there are some major players or parts that make everything run smoothly:

  1. Blower fan – Think of this as the breeze that keeps the city (or furnace) fresh.
  2. Relay – This is like the traffic cop, telling electricity where to go.
  3. Sail switch – This is a safety buddy. It ensures there’s enough air flowing.
  4. Reset switch – The “do-over” button. If things go wrong, it can help restart the furnace.
  5. Circuit board – This is the brain of the operation, making sure everything talks to each other.
  6. Ignitor – The fire starter! It gets the flame going to warm things up.
  7. Propane valve – This controls the flow of propane, which is like the food for the furnace’s flame.

Outside Helpers: External Components

Now, even though the inside parts are super important, there are some friends on the outside that help the furnace do its job:

  1. Thermostat – This little device tells the furnace how warm or cool you want things.
  2. Battery – It gives power to the furnace so it can start up and run.
  3. Propane tank – This is like the fuel station, supplying the furnace with what it needs to create heat.

Troubleshooting Dometic RV Furnace 

So your Dometic furnace is giving you the cold shoulder, huh? Brrr! Let’s warm things up by figuring out what’s going wrong. Don’t worry, I’ve been there, and I’ll walk you through it. Let’s play detective together!

Step 1: Is Your RV Thermostat Feeling Okay?

First things first: let’s have a little chat with your RV thermostat.

Ask yourself, “Hey thermostat, are you doing alright?” If it says, “Yep, I’m all good!” – awesome! We can move on to the next part. But if it’s feeling a bit off, we’ve probably found our culprit.

When your thermostat is under the weather, it won’t wake up the blower motor. That’s like not being able to turn on your car because you lost the keys! So, if the thermostat’s not doing its job, it might be time for a little repair or even a replacement.

Step 2: Thermostat’s Fine, But the Motor’s Silent?

Alright, let’s say your thermostat is feeling chipper, but when you turn it on, the blower’s just chilling and not doing its thing. Here’s what you gotta do:

  1. Listen closely! Put your ear near the furnace. Do you hear the blower fan humming along? No? Let’s keep investigating.
  2. Battery Check! Batteries are like the snacks for your furnace. Maybe it’s just hungry! Ensure your battery has enough juice. It needs at least 12V to keep things running smoothly. So, recharge it if needed!
  3. Fuse Inspection! It’s always a good idea to have spare fuses. They’re like little safety nets. Check if the fuse is still in good shape. If it’s blown, swap it out.
  4. Still No Luck? If you’ve checked the power and the fuse, and everything seems A-OK but the motor’s still not in the mood to work, then it might be feeling a bit sick. This could mean the motor’s seen better days and needs some fixing up.

Well blower Motor is Running, but the Furnace is not lighting up

Alright, so here’s the thing. If your blower’s going “vroom-vroom” but there’s no fire, it could be because of this little gadget called the sail switch.

Imagine the sail switch is like a tiny flag that goes up when the wind (or in this case, the air from the blower) hits it. When it goes up, it tells your furnace, “Alright, let’s get this party started!” and the furnace lights up. But, sometimes, it can get all gunked up with dirt and stop waving that flag.

We had this exact problem with our sail switch! Our little flag-bearer stopped doing its job. So we had to give it a retirement and bring in a new one. And voila! Our furnace was back in the warmth business.

If the sail switch is working, what should be at fault?

Okay, if your sail switch is waving its flag high and proud, but still no fire, it’s time to check the furnace’s brain: the circuit board.

Now, I’ll be honest, this part is a bit tricky. It’s not every day that the circuit board feels under the weather. It could get messy from dirt or a sneaky water leak.

Pro Tip: If you’re not super familiar with the ins and outs of a circuit board, it’s a good idea to ring up a furnace mechanic expert. They’ll give it a good look and help figure out the issue.

You might hear the click of the ignitor, but it fails to ignite

So, everything’s been checked and you’re hearing a little “click”, but still no warm embrace from your furnace. Don’t lose hope; we’ve still got a couple of tricks up our sleeve!

Step 1: Ignitor Troubles?

If you’re hearing a click but no fire, let’s zero in on that ignitor:

  1. Examine the Ignitor: Kind of like checking for a scratch on your favorite CD. Look closely to see if there’s a crack on the ignitor.
  2. The Gas Valve: Sometimes the issue might be a stubborn gas valve that doesn’t want to cooperate.
  3. Buggy Business: Believe it or not, tiny critters or bugs can sometimes get in the way and block the propane from reaching the ignitor. A quick clean can make a big difference!

Step 2: Did We Get That Warm Flame Going?

Here’s hoping by now you’re feeling the warmth! But if your furnace is still acting all frosty, let’s do a final check:

  1. Propane Tank Peek: How’s your propane tank doing? Is it feeling a bit empty? Is it feeding your furnace enough?
  2. Gas Pressure Test: This is an easy one. Just turn on all the burners and take a look at the flames. Are they roaring like a campfire or just whimpering? If they’re weak, it’s a sign you might be low on propane.


And there we go, dear reader! 🎉 You’ve just taken a journey with me through the ins and outs of that Dominic RV furnace. But before we part, let’s recap and sprinkle in a few nuggets of wisdom:

Whether you’re making a sandwich or troubleshooting a furnace, the order matters, especially if you’re new to the game. Think of it as following a recipe; each step gets you closer to that delicious end result. So, if you’re not a furnace whiz (yet), it’s always best to go step by step.

Before diving into any furnace problem:

  • Make sure that propane tank is like a full water balloon, ready to go.
  • Check if your 12V power source is like a fully charged battery, all juiced up.

Ah, the reset switch, our little unsung hero! Sometimes, all your furnace needs is a quick nap and then a wake-up call. So if things aren’t heating up, hit that reset and see if the furnace sparks back to life.

Frequently Asked Questions

1. How do I troubleshoot my Dometic RV furnace if it's not turning on?

Answer: First, check if the thermostat is set to the desired temperature and mode. Make sure the RV batteries have enough charge and the propane supply is adequate. Inspect the fuse or circuit breaker and replace if necessary. If the issue persists, consult a professional for further diagnosis.

2. Why is my RV furnace running but not heating up?

Answer: If the furnace is running but not producing heat, check if the burner is igniting. Verify that the propane supply is turned on and that the gas valve is not blocked. Clean or replace the air filter, as a dirty filter can restrict airflow and affect heating efficiency.

3. What should I do if my RV furnace keeps blowing fuses?

Answer: If the furnace repeatedly blows fuses, it may indicate an electrical issue. Inspect the wiring connections for any loose or damaged wires. Check for any signs of rodents or pests that may have caused wire damage. If the problem persists, consult an RV technician for a thorough inspection.

4. My Dometic RV furnace is making unusual noises. What could be causing this?

Answer: Unusual noises from the furnace can indicate various problems. The blower motor or fan may be worn out or dirty, causing it to produce strange sounds. The burner assembly may also need cleaning or adjustment. It's best to have a professional inspect and service the furnace to avoid further damage.

5. Why does the blower fan of my Dometic RV furnace keep running continuously?

Answer: If the blower fan continues to run even when the furnace is not producing heat, it may be due to a faulty limit switch. The limit switch regulates the fan operation based on the temperature inside the furnace. A malfunctioning limit switch should be replaced by a qualified technician to ensure proper furnace operation.

6. Can I troubleshoot and repair my Dometic RV furnace by myself?

Answer: While some basic troubleshooting steps can be done by RV owners, it is recommended to seek professional help for complex furnace issues. Attempting repairs without adequate knowledge and experience can cause further damage or compromise safety. A qualified technician will have the necessary tools and expertise to diagnose and fix the problem correctly.

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