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Why Does My RV Furnace Keep Clicking?

If you’re an RV owner, you know that a comfortable and reliable furnace is essential for a pleasant camping experience.

However, it can be quite frustrating when your RV furnace keeps clicking and doesn’t provide the warmth you need.

In this article, we will explore the possible reasons behind this issue and provide practical solutions to help you troubleshoot and fix it.

So, let’s dive in and unravel the mystery of the incessant clicking in your RV furnace.

Understanding the Basics of RV Furnace Operation

Before we delve into the reasons behind the clicking sound in your RV furnace, let’s first understand how it operates.

RV furnaces, like their residential counterparts, work by burning fuel to generate heat.

These furnaces typically run on propane gas, which is a common energy source for RVs.

When you turn on your RV furnace, it goes through a sequence of operations to provide warm air.

This sequence typically includes the following steps:

  1. The thermostat signals the furnace to start.
  2. The blower motor starts running, circulating air through the system.
  3. The igniter activates, producing a spark to ignite the propane.
  4. The burner assembly ignites the propane, generating heat.
  5. The blower motor continues to circulate the warm air throughout your RV.

Now that we have a basic understanding of how an RV furnace operates, let’s explore the potential causes of the clicking sound.

Common Causes of Clicking in an RV Furnace

There can be several reasons why your RV furnace keeps clicking without igniting or providing the desired heat.

Let’s examine some of the common culprits behind this issue:

Low Voltage

Low voltage is one of the most prevalent reasons for a clicking furnace.

When the voltage supplied to the furnace drops, it may not receive enough power to ignite properly, resulting in repeated clicking sounds.

Insufficient voltage can be caused by a weak battery, faulty wiring, or a power supply issue.

To check if low voltage is the culprit, you can use a multimeter to measure the voltage at the furnace’s electrical connections.

If the voltage is significantly below the recommended level, it’s advisable to inspect your RV’s battery, wiring, and power source.

Ignition Problems

If the furnace’s ignition system malfunctions, it can lead to continuous clicking without ignition.

The igniter may fail to produce a spark or the gas valve might not open, preventing the propane from igniting.

Ignition problems can be caused by a faulty igniter, a defective gas valve, or a clogged orifice.

To troubleshoot ignition issues, inspect the igniter for signs of damage or wear.

If the igniter appears faulty, replacing it might solve the problem.

Additionally, ensure that the gas valve is receiving the proper signals and that the orifice is clean and free from debris.

Faulty Sail Switch

The sail switch is a safety device that detects the presence of airflow in the furnace.

If the sail switch becomes faulty or gets stuck, it can prevent the furnace from igniting and cause it to emit clicking sounds.

The sail switch is typically located near the blower motor.

To address sail switch problems, visually inspect it for any signs of damage or misalignment.

Cleaning the sail switch and ensuring its smooth operation might resolve the clicking issue.

In some cases, replacing the sail switch might be necessary.

Dirty Burner Assembly

A dirty burner assembly can also contribute to clicking sounds in your RV furnace.

Over time, debris, dust, or rust can accumulate on the burner assembly, obstructing the ignition process.

When the propane tries to ignite, it encounters resistance, resulting in repeated clicking without a successful ignition.

Cleaning the burner assembly is often the solution for this problem.

Carefully remove any debris or rust, ensuring that the burner orifices are clear.

You can use a soft brush, compressed air, or a specialized cleaner to clean the burner assembly effectively.

Malfunctioning Thermostat

A malfunctioning thermostat can cause your RV furnace to click without providing heat.

If the thermostat fails to send the correct signals to the furnace, it may not initiate the ignition sequence, resulting in repeated clicking sounds.

Start by checking the thermostat’s settings and ensuring it is set to the desired temperature.

If the thermostat appears to be functioning incorrectly, you may need to replace it to restore proper furnace operation.

Now that we’ve explored the common causes of clicking in an RV furnace, let’s move on to the troubleshooting and fixing methods.

How to Troubleshoot and Fix Clicking Issues

When faced with a clicking RV furnace, you can follow these troubleshooting steps to identify and resolve the problem:

Check the Power Supply

Begin by checking the power supply to ensure that the furnace is receiving adequate voltage.

Verify the condition of your RV’s battery, inspect the wiring for any visible damage, and ensure the power source is functioning correctly.

Inspect the Ignition System

Next, inspect the ignition system components, such as the igniter and gas valve.

Look for signs of damage, wear, or clogging.

Replace any faulty parts or clean the orifices if necessary.

Clean or Replace the Sail Switch

Clean the sail switch, ensuring it moves freely and is not obstructed.

If cleaning doesn’t resolve the issue, consider replacing the sail switch.

Clean the Burner Assembly

Carefully clean the burner assembly, removing any debris, rust, or obstructions.

Ensure the burner orifices are clear to allow proper ignition.

Test and Replace the Thermostat if Necessary

Check the thermostat settings and test its functionality.

If the thermostat is malfunctioning, consider replacing it to restore proper operation.

By following these troubleshooting steps, you can address the clicking issue in your RV furnace and ensure it operates smoothly and efficiently.

Frequently Asked Questions (FAQs)

Why does my RV furnace click but not ignite?

There are several possible reasons why your RV furnace clicks but fails to ignite. Low voltage, ignition system problems, or a dirty burner assembly are common culprits. Check the power supply, inspect the ignition components, and clean the burner assembly to troubleshoot the issue.

Can a dirty burner assembly cause the furnace to click?

Yes, a dirty burner assembly can impede the ignition process, resulting in repeated clicking sounds. Cleaning the burner assembly and ensuring the orifices are clear can resolve this issue.

Is it dangerous if my RV furnace keeps clicking?

In most cases, a clicking furnace is not inherently dangerous. However, it’s essential to address the issue promptly to prevent potential safety risks and ensure your furnace operates correctly.

How often should I clean the sail switch in my RV furnace?

Cleaning the sail switch is generally recommended as part of regular furnace maintenance. However, the frequency may vary depending on usage and environmental conditions. Check your RV furnace’s manual or consult a professional for specific guidelines.

Can a faulty thermostat cause the furnace to click?

Yes, a malfunctioning thermostat can prevent the furnace from initiating the ignition sequence, resulting in repeated clicking sounds. Testing the thermostat and replacing it if necessary can resolve this issue.

Should I attempt to fix the clicking issue myself, or seek professional help?

If you have experience and knowledge in RV furnace repairs, you can try troubleshooting and fixing the clicking issue yourself. However, if you’re unsure or uncomfortable with DIY repairs, it’s advisable to seek professional assistance to ensure proper diagnosis and resolution of the problem.


A clicking RV furnace can be a frustrating issue, especially when you’re looking for warmth during your camping adventures.

By understanding the basics of RV furnace operation and the common causes of clicking, you can confidently troubleshoot and fix the issue.

Remember to check the power supply, inspect the ignition system, clean the burner assembly, and test the thermostat if necessary.

Regular maintenance and prompt attention to clicking issues will ensure your RV furnace keeps you cozy and comfortable on your travels.