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Dometic RV Furnace Troubleshooting

If you’re an avid camper or live in your RV full-time, having a reliable furnace is essential to ensure your comfort during chilly nights.

However, like any other mechanical system, RV furnaces can experience issues from time to time.

In this comprehensive guide, we will walk you through the process of Dometic RV furnace troubleshooting.

Whether you’re facing a lack of heat, strange noises, or any other furnace-related problem, this article will provide you with the knowledge and tools to diagnose and resolve the issue.

So, let’s dive in and learn how to troubleshoot your Dometic RV furnace like a pro!

Understanding Your RV Furnace

Before we delve into troubleshooting techniques, it’s important to familiarize ourselves with the basic components and workings of an RV furnace.

By understanding how the furnace operates, we can better diagnose and resolve any issues that may arise.

Components of an RV Furnace

An RV furnace consists of several key components that work together to provide warm air circulation throughout your vehicle.

These components include:

  • Burner Assembly: The burner assembly is responsible for igniting and combusting the propane fuel.
  • Heat Exchanger: The heat exchanger transfers heat from the burner assembly to the air blown into the living space.
  • Blower Motor: The blower motor circulates the warm air produced by the heat exchanger throughout the RV.
  • Thermostat: The thermostat senses the temperature inside the RV and controls when the furnace should turn on or off.
  • Propane Supply System: The propane supply system delivers the fuel needed for combustion.
  • Venting System: The venting system safely removes combustion byproducts, such as carbon monoxide, from the RV.

How Does an RV Furnace Work?

To provide warmth, an RV furnace goes through a series of steps.

When the temperature inside the RV drops below the set threshold on the thermostat, the furnace receives a signal to start heating.

Here’s a simplified overview of how an RV furnace operates:

  1. The thermostat detects a temperature below the desired level and sends a signal to the furnace.
  2. The furnace ignites the propane fuel in the burner assembly.
  3. The burner assembly generates heat, which is transferred to the heat exchanger.
  4. The blower motor activates, drawing air over the heat exchanger and distributing the warm air through the RV’s ductwork.
  5. Once the thermostat senses the desired temperature has been reached, it sends a signal to the furnace to shut off.

Common Furnace Types

There are primarily two types of RV furnaces: forced air furnaces and hydronic heaters.

Forced air furnaces are the most common and use propane combustion to heat the air.

They rely on blowers to circulate warm air throughout the RV.

On the other hand, hydronic heaters use a combination of diesel fuel and electricity to heat a liquid coolant, which is then circulated through radiators or radiant floor heating systems.

In this article, we will focus on troubleshooting forced air furnaces, specifically the Dometic RV furnace.

Dometic RV Furnace Troubleshooting

Now that we have a basic understanding of RV furnaces, let’s explore some common issues that may arise with your Dometic RV furnace and the steps you can take to troubleshoot and resolve them.

No Heat Produced

Possible Causes:

  1. Insufficient propane supply: Check your propane tank and ensure it has enough fuel.
  2. Faulty igniter: The igniter may be dirty or damaged, preventing it from igniting the propane.
  3. Tripped circuit breaker: Check the circuit breaker and reset if necessary.
  4. Malfunctioning thermostat: The thermostat may not be sending the signal to the furnace to start heating.

Troubleshooting Steps:

  1. Check the propane tank gauge to ensure there is enough fuel.
  2. Inspect the igniter for any dirt or damage. Clean or replace if necessary.
  3. Locate the circuit breaker panel in your RV and check for any tripped breakers. Reset if needed.
  4. Test the thermostat by setting it to a higher temperature and listening for a click sound near the furnace. If you don’t hear the click, the thermostat may be faulty and require replacement.

Insufficient Heat

Possible Causes:

  1. Clogged air filters: Dirty or clogged air filters can restrict airflow, reducing the furnace’s heating capacity.
  2. Damaged or leaky ductwork: Holes or disconnected ducts can lead to heat loss before it reaches the living space.
  3. Improperly adjusted heat anticipator: The heat anticipator is a component in the thermostat that regulates the cycling of the furnace. If it’s not set correctly, the furnace may not produce enough heat.

Troubleshooting Steps:

  1. Remove and clean or replace the air filters regularly to ensure proper airflow.
  2. Inspect the ductwork for any visible damage or disconnections. Repair or replace as necessary.
  3. If you’re comfortable doing so, adjust the heat anticipator on the thermostat according to the manufacturer’s instructions. Alternatively, contact a professional for assistance.

Furnace Not Igniting

Possible Causes:

  1. Empty propane tank: Check the propane tank and refill if necessary.
  2. Propane valve closed: Ensure the propane valve is open to allow fuel flow.
  3. Faulty ignition system: The ignition system, including the igniter and control board, may be malfunctioning.

Troubleshooting Steps:

  1. Verify that the propane tank has fuel by checking the gauge or visually inspecting the tank.
  2. Ensure the propane valve is fully open. If it was closed, open it slowly and listen for the sound of propane flowing.
  3. If the furnace still doesn’t ignite, it’s recommended to contact a professional technician to diagnose and repair any issues with the ignition system.

Frequent Cycling On and Off

Possible Causes:

  1. Dirty or obstructed air filters: Clogged air filters can cause the furnace to overheat and cycle more frequently.
  2. Improperly adjusted thermostat: If the thermostat is set to a narrow temperature range, the furnace may cycle more frequently.
  3. Restricted airflow: Obstructions in the ductwork or closed vents can lead to restricted airflow, causing the furnace to cycle frequently.

Troubleshooting Steps:

  1. Clean or replace the air filters regularly to ensure proper airflow and prevent overheating.
  2. Adjust the thermostat to a wider temperature range to reduce frequent cycling. Refer to the thermostat manual for instructions.
  3. Ensure all vents are open and unobstructed. Check the ductwork for any obstructions and clear them if found.

Strange Noises

Possible Causes:

  1. Loose or damaged components: Loose or damaged components, such as the blower motor or heat exchanger, can produce unusual noises.
  2. Debris in the furnace: Dirt, leaves, or other debris may have accumulated in the furnace, causing rattling or scraping sounds.
  3. Worn-out bearings: Over time, the bearings in the blower motor may wear out, leading to grinding or squealing noises.

Troubleshooting Steps:

  1. Inspect the furnace components for any visible damage or loose connections. Tighten or repair as necessary.
  2. If you suspect debris inside the furnace, turn off the furnace and carefully remove any obstructions. Use caution and follow safety guidelines.
  3. If the noise persists, it’s advisable to have a professional technician inspect the blower motor and other components for potential issues.

Furnace Blower Not Working

Possible Causes:

  1. Electrical issues: A blown fuse or tripped circuit breaker can cause the blower motor to stop functioning.
  2. Faulty blower motor: The blower motor itself may be faulty and require replacement.
  3. Blocked or damaged blower wheel: The blower wheel may be obstructed or damaged, preventing it from spinning properly.

Troubleshooting Steps:

  1. Check the fuse box or circuit breaker panel and replace any blown fuses or reset tripped breakers.
  2. Test the blower motor by switching the thermostat fan setting to “ON.” If the blower motor doesn’t activate, it may be faulty and need replacement.
  3. If the blower wheel appears dirty or obstructed, clean or remove any debris carefully. If damaged, replace the blower wheel.

Gas Smell

Possible Causes:

  1. Propane leak: A gas smell may indicate a propane leak in the system, which can be dangerous and requires immediate attention.
  2. Improper combustion: Inadequate combustion can produce a gas smell. It may be caused by a dirty burner assembly or other combustion-related issues.

Troubleshooting Steps:

  1. If you detect a gas smell, evacuate the RV immediately and ensure all doors and windows are open to allow for ventilation.
  2. Do not operate any electrical switches or create sparks inside the RV.
  3. Contact a professional technician or your local propane supplier to inspect the propane system for leaks and address the issue promptly.

Electrical Issues

Possible Causes:

  1. Faulty wiring connections: Loose or damaged electrical connections can cause intermittent or complete loss of power to the furnace.
  2. Blown fuses or tripped breakers: Electrical overloads can blow fuses or trip breakers, cutting off power to the furnace.

Troubleshooting Steps:

  1. Inspect the wiring connections to the furnace and ensure they are secure and free of damage. Tighten or repair any loose or faulty connections.
  2. Check the fuse box or circuit breaker panel and replace blown fuses or reset tripped breakers. If the issue persists, consult a professional technician.

Thermostat Problems

Possible Causes:

  1. Incorrect thermostat settings: Incorrect temperature settings or mode selection can affect the furnace’s operation.
  2. Faulty thermostat: Malfunctions in the thermostat itself can cause issues with temperature control and furnace operation.

Troubleshooting Steps:

  1. Double-check the thermostat settings to ensure they are appropriate for your desired temperature and heating mode.
  2. Test the thermostat by adjusting the temperature and observing the furnace’s response. If the furnace doesn’t turn on or off as expected, the thermostat may require calibration or replacement.

Ventilation and Airflow Issues

Possible Causes:

  1. Blocked vents: Obstructions in the vents or registers can restrict airflow, affecting the furnace’s performance.
  2. Closed or blocked return air grilles: Insufficient return airflow can lead to reduced heating efficiency.
  3. Restricted or damaged ductwork: Kinks, disconnections, or damage to the ductwork can impede airflow and affect heat distribution.

Troubleshooting Steps:

  1. Ensure all vents and registers are open and unobstructed. Remove any obstructions, such as furniture or curtains, blocking the airflow.
  2. Check the return air grilles and ensure they are open and free of blockages.
  3. Inspect the ductwork for any visible damage, kinks, or disconnections. Repair or replace damaged sections as needed.

Carbon Monoxide Concerns

Possible Causes:

  1. Improper combustion or venting: Incomplete combustion or blocked vents can lead to the release of carbon monoxide (CO) gas, a dangerous and potentially lethal substance.

Troubleshooting Steps:

  1. Install carbon monoxide detectors in your RV to monitor CO levels. Follow manufacturer’s instructions for proper placement and testing.
  2. Ensure the furnace’s venting system is clear and unobstructed.
  3. Regularly inspect and maintain your furnace, including annual professional inspections, to minimize the risk of carbon monoxide issues.


How often should I inspect and maintain my RV furnace?

It’s recommended to have your RV furnace inspected and maintained at least once a year, preferably before the camping season begins. Regular maintenance helps identify and address potential issues before they become major problems. Additionally, keeping the furnace clean and well-maintained ensures optimal performance and extends its lifespan.

Can I troubleshoot and repair my RV furnace myself?

While some minor troubleshooting and maintenance tasks can be performed by RV owners, it’s essential to prioritize safety and have a basic understanding of the furnace’s components and operation. Always follow the manufacturer’s instructions and consult a professional technician for complex repairs or if you’re uncertain about any aspect of troubleshooting.

Should I clean the furnace’s components myself?

Cleaning certain components, such as air filters and exterior surfaces, can be done by RV owners. However, internal cleaning and maintenance of components like the burner assembly or blower motor are best left to professionals. If you’re unsure, consult the furnace’s manual or contact a qualified technician.

How long does an RV furnace typically last?

The lifespan of an RV furnace can vary depending on usage, maintenance, and quality of components. However, with proper care and regular maintenance, an RV furnace can last anywhere from 10 to 20 years. Routine inspections, cleaning, and timely repairs help ensure the furnace’s longevity.

Can I replace my RV furnace with a different brand or model?

It’s generally recommended to replace your RV furnace with the same brand and model or a compatible replacement recommended by the manufacturer. Each furnace model may have specific installation requirements and compatibility considerations. Consult the manufacturer or a professional technician to ensure a proper replacement.

Why is regular maintenance important for an RV furnace?

Regular maintenance is crucial to keep your RV furnace running efficiently and safely. Maintenance tasks, such as cleaning, lubricating moving parts, and inspecting for any wear or damage, help identify potential issues and prevent costly breakdowns. Additionally, professional inspections ensure proper combustion, venting, and safety measures are in place.


Taking the time to understand the operation of your Dometic RV furnace and troubleshooting common issues can save you from discomfort and potential dangers during your RV adventures.

By following the troubleshooting steps outlined in this article, you can address many common problems that may arise with your furnace.

Remember, safety should always be a top priority.

If you encounter a problem that you’re unsure how to resolve or if you suspect a gas leak or carbon monoxide issue, seek professional assistance immediately.

Regular maintenance, inspections, and prompt repairs will help keep your Dometic RV furnace in optimal condition, ensuring you stay warm and comfortable on your RV journeys.