RV Furnace Pilot Light Troubleshooting and Maintenance

The RV furnace pilot light is essential for safe heating while camping. This guide explains how the pilot light works, common causes of failure, step-by-step relighting instructions, safety precautions, maintenance tips, and when to seek professional help. It emphasizes practical, accurate steps for American RV owners to keep interiors warm and appliances reliable.

Issue	Likely Cause	Simple Fix
Pilot Won’t Light	Empty propane tank, blocked orifice, faulty thermocouple	Check propane, clean or relight, inspect thermocouple
Pilot Keeps Going Out	Weak thermocouple, draft, dirty pilot	Secure pilot shield, clean pilot, replace thermocouple
No Heat With Lit Pilot	Blower failure, limit switch, thermostat issue	Check power, fuse, thermostat settings

How An RV Furnace Pilot Light Works

An RV furnace pilot light provides a small, continuous flame that ignites the main burner when the thermostat calls for heat. Most RV furnaces use propane and a standing pilot or intermittent pilot system. The pilot flame heats a thermocouple or thermopile that provides a safety signal to the gas valve. If that signal disappears, the gas valve shuts off to prevent leaks.

Common Reasons The Pilot Light Fails

Understanding common causes helps narrow troubleshooting. Empty or low propane is a frequent culprit. A blocked pilot orifice, dirt, insect nests in vents, or a weak or failing thermocouple can also prevent ignition. Drafts, high altitude, and defective gas valves or igniters may be responsible. Regular maintenance prevents many problems.

Tools And Materials Needed

• Adjustable wrench and screwdrivers for access panels
• Small wire brush or compressed air to clean the pilot area
• Replacement thermocouple and pilot assembly (model-specific)
• Multimeter for electrical checks
• Propane gauge or spare propane tank to verify fuel
• Manufacturer manual and safety gloves

Safety Precautions Before Working On The Pilot

Safety is critical when dealing with propane and open flames. Always shut off the propane supply before disassembling components. Work in a well-ventilated area and avoid open flames until leaks are ruled out. Use a soapy water solution to check for leaks at connections. If a strong gas odor exists, evacuate the RV and contact a professional.

Step-By-Step Guide To Relighting An RV Furnace Pilot

1. Prepare And Verify Fuel

Confirm the propane tank has fuel by checking the gauge or switching to a known full tank. Turn off any appliances that use propane and open a window for ventilation. Verify the furnace thermostat is set to the pilot or off position per the manufacturer’s instructions.

2. Access The Pilot Assembly

Remove the furnace access panel using a screwdriver or wrench. Locate the pilot assembly, which includes the pilot tube, thermocouple, and sometimes a piezo igniter. Consult the furnace model manual for exact component locations.

3. Turn Gas To Pilot And Ignite

Turn the gas control knob to the pilot position. Depress and hold the knob to allow gas to flow to the pilot. Use the built-in igniter or a long-stem lighter to ignite the pilot. Maintain pressure on the gas control for 30–60 seconds after ignition to allow the thermocouple to heat and signal the valve.

4. Observe And Test

Release the control knob slowly. If the pilot stays lit, turn the control to “On” and set the thermostat to call for heat. If the pilot goes out, repeat the process once more. Persistent failure to stay lit indicates a component problem that requires inspection or replacement.

Cleaning And Maintenance For Reliable Operation

Regular cleaning extends furnace life and reduces pilot problems. Remove dust, lint, and insect debris from intake and exhaust vents. Use compressed air or a soft brush to clear the pilot orifice and thermocouple area. Inspect and replace air filters routinely to ensure proper airflow.

Thermocouple And Thermopile Checks

The thermocouple provides a small voltage when heated by the pilot. If the pilot lights but the main valve won’t open, the thermocouple or thermopile may be weak. A multimeter can measure millivolt output; consult the furnace manual for acceptable values. Replace the thermocouple if output is low or if visual corrosion exists.

Dealing With Drafts And Ventilation Issues

Drafts can extinguish a pilot flame. Inspect the furnace compartment for loose panels, vent blockages, or nearby airflow sources such as fans or open windows. Ensure exterior vents are clear of snow, leaves, or insect nests. Installing wind baffles or relocating fans away from the furnace may reduce drafts.

Common Parts To Inspect And Replace

• Pilot Orifice: Clean or replace if clogged
• Thermocouple/Thermopile: Replace if weak or corroded
• Igniter/Piezo Unit: Replace when unreliable
• Gas Valve: Replace only after confirming other parts are functioning
• Blower Motor And Limit Switch: Check if main burner does not operate despite pilot

Troubleshooting Checklist

Symptom	Immediate Checks	Next Steps
Pilot Will Not Light	Propane supply, valve position, manual ignition	Clean orifice, check igniter, test for gas flow
Pilot Lights Then Dies	Thermocouple seating, drafts, debris	Clean pilot, reseat or replace thermocouple
Pilot Lit But No Main Burner	Thermostat setting, power to furnace, limit switch	Test blower, check fuses, inspect gas valve

When To Replace Components Versus Call A Technician

Simple repairs like cleaning a pilot or replacing a thermocouple are DIY-friendly for those comfortable with basic tools. Replacement parts are inexpensive and often available by furnace model. However, call a licensed RV technician if gas leaks are detected, if the gas valve or internal electronics are suspected faulty, or if multiple components fail after standard maintenance.

Tips For Cold-Weather RV Heating

Cold temperatures and snow increase furnace strain. Keep exterior vents clear and insulate the propane tank and lines if recommended. Run the furnace periodically during storage months to prevent dampness and maintain pilot reliability. Keep spare thermocouples and a basic repair kit on board for emergencies while traveling.

Preventing Pilot Problems On The Road

• Perform pre-trip checks on the furnace and propane system
• Secure loose panels and inspect vents frequently during trips
• Use fuel from trusted sources to avoid contaminated propane
• Log furnace maintenance and part replacements for long-term reliability

Manufacturer Variations And Model-Specific Notes

RV furnaces differ between brands and models; always refer to the furnace manual for model-specific procedures and part numbers. Some modern RV furnaces feature electronic ignition systems that eliminate a standing pilot and require different troubleshooting steps. Identifying the exact model number speeds parts replacement and technical support.

Useful Resources And Further Reading

Consult owners’ manuals, RV forums, and manufacturer support pages for diagrams and replacement part numbers. For safety-sensitive tasks involving gas valves, consider resources from RVIA (Recreation Vehicle Industry Association) and Propane Education & Research Council for best practices.

Summary Of Key Actions

• Verify propane supply before troubleshooting.
• Clean the pilot assembly and check for drafts.
• Test and replace the thermocouple if the pilot won’t hold.
• Use caution with gas leaks — evacuate and call a professional.
• Keep basic tools and spare parts on board for trips.