RV Furnace Repair: Costs, Common Issues & Troubleshooting

RV furnace repairs cost $50–$600 for most issues. Learn about common problems with Suburban and Atwood/Dometic furnaces, what repairs cost, and when to DIY vs. call a mobile tech.

Get a Free Estimate

No obligation. 100% free.

Your information is safe. No spam, no obligation.

RV Furnace Repair Costs by Component

Item	Low	High
Circuit Board	$150	$400
Blower Motor	$100	$300
Sail Switch	$30	$80
Ignitor / Electrode	$50	$150
Gas Valve	$100	$300
Thermostat	$30	$150
Full Unit Replacement	$500	$1,500
Diagnostic Fee (mobile tech)	$50	$150

Based on average costs for RV furnace repairs (2025–2026 data). RV furnace parts are generally less expensive than residential furnace parts, but mobile technician labor rates ($75–$150/hour) can add up. Costs vary by brand (Suburban vs. Atwood/Dometic) and location.

Common RV Furnace Brands and Models

Two manufacturers dominate the RV furnace market, and knowing which one you have helps with troubleshooting and parts sourcing.

Suburban

Suburban is the most common RV furnace brand in North America. Their SF-series furnaces (SF-20, SF-30, SF-42) are rated by BTU output — the SF-30 (30,000 BTU) is the most widely installed. Suburban furnaces are known for overall reliability, but the circuit board is their weak point. A failed circuit board is the most common expensive Suburban repair ($150–$400). Parts are widely available at RV supply stores and online retailers like PPL Motorhomes and RV Part Shop.

Atwood / Dometic

Atwood furnaces are now manufactured under the Dometic brand following their 2017 acquisition. Common models include the Excalibur series and the legacy Hydro Flame line. Atwood units are typically lighter than Suburban furnaces, making them popular in travel trailers and smaller RVs. They use a direct spark ignition system and are known for sail switch failures on older models ($30–$80 to replace). The Dometic transition has improved parts availability, but some older Atwood-specific boards can be harder to source.

Both brands use standard 12V DC power, run on propane (LP gas), and share a similar basic design: a combustion chamber with a blower motor that pushes heated air through the RV's duct system.

Common RV Furnace Problems

RV furnaces are simpler than residential units, but road vibration, moisture, storage periods, and 12V electrical systems create unique failure patterns.

Ignition Lockout ($50–$400)

The most common RV furnace problem. The furnace attempts to ignite, fails, and locks out after 2–3 tries. You'll hear the blower start, a clicking sound (the ignitor attempting to fire), and then the blower shuts off.

Common causes:

Dirty or corroded ignitor electrode — clean with fine sandpaper ($0 DIY)
Empty or low propane tank — check the gauge and refill ($20–$40)
Weak battery or low voltage — RV furnaces need 10.5+ volts DC to operate reliably
Obstructed exhaust or intake tubes — insects (especially mud dauber wasps) love to nest in these during storage
Gas valve failure — solenoid won't open due to voltage drop or internal failure ($100–$300)

Weak Airflow and Cycling Issues ($30–$300)

Sail switch failure is one of the most common RV furnace problems. The sail switch is a small flap that detects blower airflow. If it's stuck or failed, the furnace ignites but shuts down within 15–30 seconds as a safety measure. This is a $30–$80 fix and a good DIY project.

Blocked exhaust or intake vents are a seasonal issue, especially after storage. Mud daubers (wasps), spider webs, and debris commonly block the exterior furnace vents. Always inspect vents before the first use of the season.

Overheating / limit switch trip happens when return air is blocked or the heat chamber is dusty. The furnace runs briefly, overheats, and the limit switch shuts it down. Cleaning the combustion chamber and ensuring clear airflow usually resolves this.

Duct disconnections are unique to RVs. The flexible ductwork can come loose from vibration during travel, reducing heated airflow to parts of the RV.

12V Electrical Issues ($0–$150)

Corroded wiring connections result from road vibration and moisture exposure. A voltage drop across a corroded connection can prevent the furnace from operating even with a fully charged battery.

Blown 12V fuse — always check the fuse panel before assuming a major furnace failure. This is a free fix that's overlooked more often than it should be.

Weak converter/charger — even with shore power connected, a failing converter may not adequately charge the battery, causing intermittent furnace operation.

DIY Troubleshooting

Many RV furnace problems can be diagnosed and fixed by the owner. Before calling a technician, work through these steps in order.

Step 1: Check the Basics

Propane: Is the tank at least 1/4 full? Is the main valve open? Are other propane appliances (stove, water heater) working?
Battery voltage: Measure at the furnace terminals. You need 10.5V DC minimum. Low voltage is the number one cause of ignition lockout.
Thermostat: Is it set above the current temperature? Try turning it all the way up to force a call for heat.
Fuse: Check the 12V DC fuse for the furnace in your RV's fuse panel.

Step 2: Inspect the Exterior Vents

Go outside and check the exhaust and combustion air intake tubes on the side of the RV. Look for insect nests (mud dauber wasps are the most common culprit), dirt, leaves, debris, or snow/ice blockage. A blocked exhaust tube is one of the most common and easily fixed RV furnace problems.

Step 3: Clean the Ignitor

If the furnace tries to light but can't, the ignitor electrode may be dirty or corroded. Remove the furnace access panel, locate the electrode near the burner, and gently clean it with fine-grit sandpaper or emery cloth. Check the electrode gap — it should be approximately 1/8 inch from the burner.

Step 4: Check the Sail Switch

The sail switch is a small flap inside the furnace that detects airflow from the blower. If it's stuck, bent, or dirty, it won't close properly and the furnace won't ignite. You can sometimes free a stuck sail switch by gently moving the flap by hand.

DIY vs. Mobile RV Technician

Good DIY Projects

These repairs require basic tools and minimal experience:

Cleaning the burner tube and combustion chamber — Remove debris and carbon buildup with compressed air and a small brush
Replacing the sail switch — $30 part, 15-minute job with a screwdriver
Cleaning or replacing the ignitor electrode — Fine-grit sandpaper to clean, or a $50–$150 replacement
Checking and replacing the 12V fuse — Free to check, a few dollars to replace
Clearing exhaust and intake vents — Remove mud dauber nests, spider webs, and debris
Replacing the thermostat — RV thermostats are simpler than residential models ($30–$150)
Checking battery voltage and connections — A multimeter ($15–$30) is a worthwhile investment

Leave to a Mobile Tech or Shop

Circuit board replacement — Brand-specific and requires proper programming/testing ($150–$400)
Gas valve replacement — Involves propane system work that should be done by a certified technician ($100–$300)
Blower motor replacement — Requires proper wiring and airflow testing ($100–$300)
Any repair where you smell propane — Evacuate the RV and call a professional immediately
Warranty work — DIY repairs can void your furnace or RV warranty

Where to Find RV Furnace Repair

Mobile RV technicians — Come to your campsite or storage location ($75–$150/hour plus parts)
RV dealership service departments — Best for warranty work, but often more expensive
RV-specific repair shops — Good balance of expertise and cost
HVAC companies — Some service RV units, but this is less common

Winterization and Seasonal Maintenance

Proper seasonal care prevents most RV furnace failures and extends the life of your unit beyond the typical 10–15 year lifespan.

Pre-Season Startup (Fall)

Before your first cold-weather trip of the season:

Run the furnace at home or in the driveway — don't wait until you're at a remote campsite
Inspect exhaust and intake vents for insect nests and debris
Clean the combustion chamber and burner tube
Test on a full propane tank with a fully charged battery
Check all duct connections under the RV and inside cabinets

Mid-Season Maintenance

Keep the battery charged via shore power, generator, or solar
Carry a spare sail switch and ignitor — they're cheap ($30–$50 each) and the most common failure parts
Install vent cover screens to prevent insect blockage at campsites

End-of-Season Storage

Run the furnace for 10 minutes before putting the RV in storage to burn off moisture
Cover exterior vents with mesh screens (not solid caps — solid covers trap condensation)
Disconnect propane if storing long-term
Keep the battery on a float charger or maintainer to prevent sulfation

Cold-Weather Camping Tips

RV furnaces consume significant battery power — plan for shore power or a generator on extended trips
Propane consumption runs approximately 1 lb per hour for a 30,000 BTU furnace at full output
Supplement with a portable electric space heater when on shore power to reduce propane use and battery drain
Keep the propane tank at least 1/3 full — propane doesn't vaporize well when nearly empty in cold weather

Find an RV Furnace Repair Tech

No obligation. 100% free.

Your information is safe. No spam, no obligation.

Connect with mobile RV technicians and service centers in your area. Compare quotes for diagnosis, repair, or furnace replacement.

RV Furnace Repair FAQ

How much does RV furnace repair cost?

Most RV furnace repairs cost $50 to $600. Common fixes include sail switch replacement ($30–$80), ignitor replacement ($50–$150), and circuit board replacement ($150–$400). A full RV furnace replacement runs $500–$1,500 installed. Mobile technician rates are typically $75–$150 per hour plus parts. For residential furnace costs, see our [furnace repair cost guide](/furnace-repair/cost).

Why does my RV furnace ignite then shut off?

The most common cause is a failed or stuck sail switch — a $30–$80 part that detects blower airflow. If the switch doesn't register airflow, the furnace shuts down within 15–30 seconds as a safety measure. Blocked exhaust vents (mud dauber nests are a frequent culprit) and a tripped limit switch from restricted return air are also common causes.

Can I repair my RV furnace myself?

Many RV furnace repairs are DIY-friendly. Replacing a sail switch, cleaning the ignitor electrode, checking fuses, and clearing blocked vents are all manageable with basic tools. However, circuit board replacement, gas valve work, and blower motor replacement should be left to a certified technician. Never attempt repairs if you smell propane.

How long does an RV furnace last?

RV furnaces typically last 10 to 15 years with proper maintenance. Road vibration, moisture exposure, and storage conditions can shorten lifespan compared to residential furnaces. Regular seasonal maintenance — especially pre-season cleaning and vent inspection — is the best way to maximize longevity.

Should I repair or replace my RV furnace?

If the repair costs more than 50% of a new unit ($500–$1,500 installed), replacement usually makes more sense. Circuit board and blower motor repairs on an older furnace (10+ years) often aren't worth it. RV furnaces are relatively affordable compared to residential units, making replacement more practical for major failures.

Why won't my RV furnace work on battery power?

RV furnaces require 12V DC power with sufficient amperage. If your battery voltage is below 10.5V, the furnace won't ignite. Check the battery with a multimeter, inspect for corroded connections, and verify the 12V fuse is intact. Even with shore power, a failing converter may not charge the battery adequately to run the furnace.

Get Your RV Furnace Ready for the Road

Whether you need a quick fix or a full furnace replacement, connect with mobile RV technicians and certified service centers near you.

Get Free Estimate