What are the most common RV furnace problems?

common rv furnace problems include the furnace wont light, it wont heat properly or it could cycle on and off. Furnace could also make nosie. common rv furnace problems include the furnace wont light, it wont heat properly or it could cycle on and off. Furnace could also make nosie.

Can a bad propane regulator cause an RV furnace to not heat?

A bad propane regulator will not send enough fuel to your furnace and it won’t light correctly. One way to check for a lousy propane regulator in an RV is to light up the gas stove. If the burners have flames that change colors, this is a good indication that the propane regulator is working.

Why is my thermostat not working in my RV?

The thermostat is not connected to the onboard batteries in some RVs. These units are usually powered by AA batteries. In the majority of these cases, the display screen is going to blink or it might also provide you with a blank screen. In such cases, replacing the batteries will be a sensible idea.

Why does my RV furnace keep freezing up?

This is a common problem with furnaces in RV. When the temperature is going down, its snowing and everything is freezing, you don’t want your furnace to have this issue. Lets check how to troubleshoot this problem.

Why is the fan not working on my RV heater?

Check to see if your battery is putting out 12V at the furnace. If there’s not enough voltage coming from the battery, the fan won’t run. The heat runs on 12V, not 110. Otherwise, it could be a tripped circuit breaker or a blown fuse.

What happens if the fan is running but there is no heat?

What if the fan is running, but there is no heat? The furnace has an internal flow switch, otherwise known as a “sail switch.” The sail switch is an on/off switch, which when there’s not enough airflow, will stop the furnace from igniting. The fan will run, but there will be no heat.

Why is my furnace not igniting my camper?

Make sure valve is entirely turned on for proper supply of gas. Once you start the furnace and smell propane at the exhaust of the camper or RV then that means you have propane supply and the problem could be with the furnace ignitor. In such a scenario you may have to show the circuit board to a rv repair professional.

Why does my RV fan run but no heat?

One of the most common ones is that the RV furnace and its fan runs but there is no heat. If you get this issue then here are some steps that should be able to help you.

Why does my Forest River furnace not start?

In terms of Forest River furnaces, they usually have issues with no ignition, cold air blowing or will simply not start. A few people even reported problems with thermostats. When compared to other manufacturers, these problems don’t seem as bad. After all, a thermostat can be easily replaced with any RV model. Suburban RV Furnace Troubleshooting

Why is my RV heater not working?

If the air flow is not sufficient then the switch will prevent the furnace from igniting and the fan will run but you will get no heat. A slow motor speed could be caused by a low battery or other low voltage cause such as a bad connection in the wiring.

What are some common problems of Coleman furnaces?

Pilot Keeps Going Out. The biggest reason a Coleman furnace pilot light keeps going out is the thermocouple is placed too far from the pilot light.
Insufficient Heat Provided. Try raising the thermostat by a few degrees.
Furnace doesn’t run. Check the fuse box or the circuit breaker to make sure that power is getting to the furnace.
How do you troubleshoot a gas furnace?
Turn off the furnace at the circuit breaker. Locate the blower motor and examine its belt to check for cracks; see if it’s frayed or broken. Simply replace the belt to get the blower motor operational again. Use caution, but check the blower motor to see if it is hot.
How can I Keep my RV furnace in good condition?
A preventive maintenance can really help in keeping the furnace in good working condition. A newly installed furnace can also face issues in which case its easy to get it replaced under warranty.
What to do if your propane furnace is leaking?
On some occasions, the gaskets might wear on a hose leading to a minor leakage. It might be possible for you to use duct tape for wrapping a small leakage. Although it might work, it will not be able to fix the problem permanently. On the majority of the RV propane furnaces, the igniter requires a minimum of 10.5 V for firing properly.
What kind of furnace should I get for my RV?
Those types are a direct discharge furnace and a ducted furnace. Let’s take a closer look at each one. Direct Discharge – This type furnace blows air directly from the unit’s faceplate; they are normally more compact and lightweight. In general, direct discharge furnaces are more used in smaller, older RVs.
What causes a furnace to turn off in an RV?
Check for the furnace box, see if there is anything that is blocking the furnace vents. Any obstruction in the vents will result in malfunctioning and heating of the furnace. This will lead the temperature limiting switch to turn off the furnace. Vents can blocked due to various things, debris dust can also block it.
Do you need electricity to run a forced air furnace?
Electricity is needed to turn on the system and run the fans. Because of this, an RVer will need both propane and electricity to run their forced air RV furnace. The advantage of this heater is that it is relatively inexpensive, easy to maintain, and it can heat the inside of the RV as well as the basement area that holds the RV’s pipes.
What should I do if my RV furnace is corroded?
Prepare a slurry blend of water and baking soda. Disconnect carefully the wires and the connections from the terminal which is corroded. Make use of a toothbrush for applying the baking soda mixture and scrub the corroded material carefully.
Why is my furnace not working in my camper?
Why is my furnace not working in my camper? The answer to this question can vary a little depending on the type of furnace you have. If you have a propane furnace or wall heater, the first thing to check is the propane tank which might be the main reason of ignition failure on a RV furnace.
Do you need propane for an RV furnace?
An RV furnace needs both battery power and a fuel, such as propane to function. We’ll also talk about the minimum amount of battery power needed to keep your RV furnace running. If your RV furnace isn’t working right, there are things to check, and you’ll learn about them here.
Do you need to check your RV furnace?
Like any other system, your RV furnace needs occasional maintenance, but it’s a minimal contribution for this appliance. There’s not much that can go wrong on an RV furnace that’s actually fixable by the average owner, so checking for problems is going to be your biggest chore and contribution.
What’s the best way to troubleshoot an RV furnace?
If you run the system and you get nothing, RV furnace troubleshooting experts like to hook a multimeter up to the furnace to check for proper voltage–10.5 volts is ideal. The key to a better heating system is finding the source of any problem that seems odd and addressing it.
Are there any warranties on a coachman?
Warranty information with respect to these items is available from your dealer. The Warrantor further makes no warranty with regard to any product used for commercial purposes, as a permanent residence or as a rental unit, or any product not registered and normally used in the United States or Canada. LIMITATION AND DISCLAIMER OF WARRANTIES
How does the furnace on an Atwood RV work?
Here is how the Atwood furnace works: The thermostat calls for heat when the temperature drops below the setting and a circuit is closed sending the request to the module board. The module board then starts the blower motor which pushes air into the burner chamber.
Why does my furnace keep cycling on and off?
If the furnace keeps cycling on and off despite the temperature meeting then there is some problem with the furnace functioning. This can be caused if the furnace vents are blocked. Check for the furnace box, see if there is anything that is blocking the furnace vents.
What should I do if my furnace is not starting?
If your furnace is not starting, you will need to look at the following items: 1. House battery power. The furnace needs at least 10.5 volts DC and sometimes more to open the valve. This must be checked at the module board with a multimeter.
What kind of DC does a gas furnace need?
The furnace needs at least 10.5 volts DC and sometimes more to open the valve. This must be checked at the module board with a multimeter. 2. Blown fuse. There is a 12-volt fuse in the distribution center and sometimes an inline fuse in the module board on the furnace.
Is the propane tank responsible for the furnace?
In case it does work, you can be certain that the propane tank is not responsible for this. In case no evidence of any gas is found within the system, it will be imperative to check the system thoroughly beginning with the tank.
Why did coachmen design the new Brookstone RV?
At Coachmen, we’ve enjoyed great friendships with our customers for the last 50 years. Because of these relationships and times we’ve spent around the campfire chit chatting, we understand how RVs are used. The all-new redesigned Brookstone is the result of this inspiration.
Can a RV furnace be your worst enemy?
On an extended RV trip into the desert or the great Northern wilderness, the RV furnace can either remain your best friend or become your worst enemy. Proper RV furnace troubleshooting comes down to how you maintain it–do you take care of it regularly or do you take shortcuts to fix serious problems?
How long have coachmen RVs been in business?
At Coachmen, we’ve enjoyed great friendships with our customers for the last 50 years. Because of these relationships and times we’ve spent around the campfire chit chatting, we understand how RVs are used.
If your furnace is not starting, you will need to look at the following items: 1. House battery power. The furnace needs at least 10.5 volts DC and sometimes more to open the valve. This must be checked at the module board with a multimeter.
Why does my thermostat not work on my RV furnace?
Your thermostat’s anticipator regulators can also be the source of this problem as well. Check for the anticipator’s slide position again and replace the thermostat altogether if needed. An RV furnace has an internal sail switch that will prevent the machine from igniting in cases of air flow being insufficient for combustion.
Why is My Propane fan not working in my RV?
Heat means that there is gas flowing so you can avoid checking the propane again. The thermostat itself can be the culprit of a dead fan even if there is heat. Glance over the settings first to be sure they’re correct.
This is a common problem with furnaces in RV. When the temperature is going down, its snowing and everything is freezing, you don’t want your furnace to have this issue. Lets check how to troubleshoot this problem.
How to troubleshoot a travel trailer gas furnace?
Many new RV furnaces have replaced the pilot light with a direct spark ignition system. If your furnace is struggling to keep the pilot light lit, check the thermocouple to make sure it’s positioned correctly. A malfunctioning regulator on your propane tank could also result in an irregular pilot light.
How to troubleshoot RV furnace that wont ignite?
Step One: Create a slurry mixture of baking soda and water. Step Two: Carefully disconnected the connections and wires from the corroded terminal. Step Three: Apply the baking soda slurry to an old toothbrush and carefully scrub away the corroded material.
What are some tips for RV furnace repair?
There are some tips for RV furnace repair: Confirm your thermostat is set to heat Check your furnace switch Change your furnace air filter Check the circuit breaker
How to troubleshoot an overheating furnace?
- which restrict air flow and can potentially lead to overheating.
- dirt and a variety of other particles as air passes through them.
- Inspect your furnace’s evaporator coil.
- Check your furnace’s blower fan.
  What is a RV furnace?
  Much like a house furnace, an RV furnace has a central spot that creates the heat and a series of ducts or tubes that carry the warm air into the various parts of the interior. This basic design exists whether you’ve got a large motor home or a smaller trailer version.
  What should I do if my RV heater is leaking?
  Before you start wondering what to do to make your furnace work better, take the time to seal your RV well and prevent air leaks. It is a little silly to have a furnace blasting heat into your RV if the heat is immediately leaking to the outside world.
  How long does it take for an RV furnace to turn on?
  An RV furnace will take a few seconds to turn on after the thermostat is switched to the “on” position. Once it does come on, you can expect to wait another 15–30 seconds before the flame ignites and warm air comes through the vents.
  What do you need to know about a propane heater in an RV?
  Air flow is necessary for your RV furnace to work properly. Therefore, it’s incredibly important to keep your RV propane heater vented to the outdoors and ensure the air intake is unobstructed. Additionally, vents should be kept uncovered while the furnace is on. #6. LP Gas Regulators All RVs come equipped with LP gas regulators.
  An RV furnace will take a few seconds to turn on after the thermostat is switched to the “on” position. Once it does come on, you can expect to wait another 15–30 seconds before the flame ignites and warm air comes through the vents.
  A preventive maintenance can really help in keeping the furnace in good working condition. A newly installed furnace can also face issues in which case its easy to get it replaced under warranty.
  Do you need to know how much propane to run an RV heater?
  If you decide that space heaters aren’t for you and you’d rather just run your big RV furnace, you might want to know how much RV heater propane you should expect to use. After all, these things are known for being propane hogs, and knowing how much propane you’ll use can help with budgeting.
  Is there an owner’s manual for a Dutchmen RV?
  Dutchmen Manufacturing Owners Manual 4/1/20163 In addition to this Owner’s Manual, any manuals supplied to us by a specific component manufacture for products installed in your unit are supplied with the unit. You may be entitled to additional warranties beyond the Dutchmen’s Limited One (1) Year Warranty on individual components.
  When do you need Dutchmen parts and service?
  When you’re in need of only the best RV services, whether it’s for replacement parts, a routine checkup or if you simply need a question answered, Dutchmen’s industry-leading parts and service department is ready to help you get back on the road, and stay there longer.
  What does it mean when your furnace won’t turn on?
  Here’s what to check first. If the thermostat is not indicating that it’s powered on or won’t kick on the furnace, the batteries might have run out of juice and need a replacement.
  Why is the pilot light on my furnace not working?
  If your furnace is located by a door leading to the outside or you had a fan running near your furnace, the breeze could have extinguished the pilot light. However this may have happened, you will need to relight it. It’s important to note that automatic ignition furnaces do not need to be relit.
  When does the Dutchmen owners manual come out?
  Dutchmen Manufacturing Owners Manual 4/1/20161 This manual is based on the latest information available at the time of publication. Due to continuous product development and improvements, Dutchmen Manufacturing reserves the right to make changes in product specifications and components without prior notice.
  What should I Set my thermostat to when my furnace won’t start?
  Typically, you should set your thermostat’s temperature to about 5 degrees above room temperature. You’ll also want to make sure that your thermostat is not broken or needs to be recalibrated. These problems can also cause your furnace to not start.
  Is there a pilot light on a gas furnace?
  Hi there, thanks for the question. This model does not actually have a “pilot light,” but rather a direct spark ignition (DSI) that ignites the flame. When the temperature get down to the specified low, the gas valve opens and LP or liquid propane flows through an orifice to the burner assembly.
  Why is my Atwood 8531 furnace not igniting?
  It turned out to be in the gas valve not getting the proper pressure to the heater. Lifted the little cap off the gas valve and inside turned the inserted screw very gently till it stopped. Do not tighten. The furnace has worked perfectly ever since. I found that my atwood 8531 furnace would not ignite unless I pounded on the side of the furnace.
  What kind of igniter board do I need for Atwood furnace?
  * Please Note: You may add the OEM igniter board 31501 or after-market igniter board DPFAN50PLUS, the gas valve option and the blower motor options from the option box above.*
  Why does my water heater flame keep going out?
  The flame will go out if the tube is clogged with dirt or debris. Sometimes, the tube might be partially clogged and supplying very little gas for combustion- No wonder your pilot light keeps going out. The Solution: Thorough cleaning should do the trick.
  What to do if your camper has a propane leak?
  Ensure to verify what exactly the propane line is going to enter inside the body of the camper. On some occasions, the gaskets might wear on a hose leading to a minor leakage. It might be possible for you to use duct tape for wrapping a small leakage. Although it might work, it will not be able to fix the problem permanently.
  Why is there no flame on my RV water heater?
  If the unit clicks but there is no flame, it might mean there is a clog or blockage in the system. When RV water heater troubleshooting, check to verify the area near the water heater is cleaned out and free of debris. The final thing to look at is the flame.
  Can You camp in an RV with a propane heater?
  Fortunately, winter camping is completely possible in an RV. Not only that, but with an RV propane heater you can stay nice and warm in your motorhome or travel trailer, no matter where you roam. Looking to replace or repair your RV propane furnace?
  Where is the cover on an RV water heater?
  Getting the cover off your water heater, located on the outside of your curb-side or street-side sidewall, is any easy thing. It is just a turn-able tab that secures the cover. Once you have located the cover and opened it up, you want to be sure that mud daubers have not made themselves a home in your water heater.
  Can a bad propane regulator cause a bad heater?
  A bad regulator can cause problems with your camper heater propane supply, so this is a bit of maintenance you’ll want to make sure to keep up with. To check your regulators, start up the furnace and look at the flame in the burner. It should be blue with no yellow. If this isn’t the case, you may have an LP gas regulator on the way out.
  What should I do if my RV furnace wont start?
  Slide anticipator for adjustments. Try setting the temperature to maximum and give some time for it to start, it may take around 30-40 seconds to start the fan. If the battery isn’t good anymore do check with the manufacturer if its still in warranty.
  Why does my RV furnace not smell propane?
  If you are not able to smell propane at the exhaust then that means you are out of propane. To further verify if the gas supply is real short, turn on the gas stove and observe the flame if it isn’t very meager then your gas supply is okay but your furnace is not receiving the gas supply probably due to gas valve failure to open.
  Is it good investment to replace RV furnace?
  Replacing the existing RV furnace can be a good investment. Remember a good furnace is a necessary appliance to have in your RV, a broken or malfunctioning furnace can give you hard time.
  Slide anticipator for adjustments. Try setting the temperature to maximum and give some time for it to start, it may take around 30-40 seconds to start the fan. If the battery isn’t good anymore do check with the manufacturer if its still in warranty.
  What happens when the furnace gets too hot?
  That thermo switch opens if the furnace gets too hot and shuts down the gas. These two switches are safety switches and they are in series, which means power passes from one to the other and then to the module board, which sends power to the gas valve and the igniter, which does the sparking and ignites the gas.
  Replacing the existing RV furnace can be a good investment. Remember a good furnace is a necessary appliance to have in your RV, a broken or malfunctioning furnace can give you hard time.
  Where can I get a gas furnace to relight?
  Hi, we have a 2016 Forest River Rockwood Signature Ultra Lite fifth wheel, and I cannot for the life of me get the pilot light to relight. It’s a Suburban gas furnace. We live in South Carolina and the nearest dealer is 55 miles away.
  What does it mean when furnace wont ignite camper?
  A good way to test this out is to run the blower, (blower is apt to operate fine under 10.5 V) if the blower runs then that means the battery supply may be under 10.5 V and thus its not able to open the furnace valve. Best way will be to use multimeter and clear the doubts, it would show you exact output voltage.
  If you are not able to smell propane at the exhaust then that means you are out of propane. To further verify if the gas supply is real short, turn on the gas stove and observe the flame if it isn’t very meager then your gas supply is okay but your furnace is not receiving the gas supply probably due to gas valve failure to open.
  What to do if your RV furnace is loud?
  Closing the valve that feeds propane to the furnace and pulling the fuse to the furnace will ensure your safety as you are working on it. FYI: Your furnace is run on your 12V electrical system so it can be used while you are unplugged.
  Why is my RV furnace blowing dirt around?
  Everyday dirt and dust can get in your ducts through normal use of your RV. Then, when the furnace comes on it’ll blow all that gross stuff around in the air. You should also check the air outlet vents are clean for this same reason.
  How to quiet down a loud RV furnace?
  How to quiet down a loud RV furnace in six steps. Silencing a noisy RV furnace is simple if you follow these six steps: Clean filters, vents, ducts, exhaust and around the furnace; Tighten loose hardware and repair broken braces; Ductwork inspection and repair; Do a fan cleaning and lube; Check ignitor and gas lines; Blower motor repair/replacement
  Can a 12V furnace be used in a motorhome?
  FYI: Your furnace is run on your 12V electrical system so it can be used while you are unplugged. Step one should be a part of your seasonal motorhome maintenance routine; sometimes things like this get overlooked when it’s hot out or until problems arise.
  Why is my propane furnace not firing properly?
  On the majority of the RV propane furnaces, the igniter requires a minimum of 10.5 V for firing properly. In case a couple of the onboard batteries has become compromised or have run quite low, there might not be enough spark for operating the thermostat or igniting the system.
  What should I do if my Atwood furnace is not working?
  Open the main panel on the furnace and take out the filter. Clean the filter with dish-washing liquid and soap, and rinse thoroughly. Set the filter aside to dry, and reinstall it before starting the furnace back up. Contact Atwood with any additional questions or problems.
  How many Atwood furnace parts are left in stock?
  Only 10 left in stock – order soon. . Only 9 left in stock – order soon. . Only 4 left in stock – order soon. . Only 5 left in stock – order soon. . . Only 19 left in stock – order soon.
  What kind of warranty does Atwood furnace have?
  Atwood furnaces offer two-stage heating, digital thermostats and self-diagnostics. They come in a variety of sizes for different recreational vehicle needs. While most Atwood furnaces come with limited warranties and should operate normally with regular care and maintenance, owners may experience issues occasionally.
  Can a Hunker furnace be used in a car?
  Hunker may earn compensation through affiliate links in this story. Atwood furnaces are handy for use in recreational vehicles that operate during cold weather. Atwood furnaces are designed primarily for use in recreational vehicles such as motor homes and travel trailers; they heat the vehicles.
  If the furnace keeps cycling on and off despite the temperature meeting then there is some problem with the furnace functioning. This can be caused if the furnace vents are blocked. Check for the furnace box, see if there is anything that is blocking the furnace vents.
  Why is the pilot light on my gas furnace not working?
  If your furnace is struggling to keep the pilot light lit, check the thermocouple to make sure it’s positioned correctly. A malfunctioning regulator on your propane tank could also result in an irregular pilot light.
  Why is there no heat coming out of my gas furnace?
  Check the propane level in your tanks. The furnace blower may be able to start, but there will be no heat coming out because there is no gas to ignite the burner. A tank with very little gas or an issue in the gas line can lead to low gas pressure. This will result in no heat from the furnace or lack of a constant pilot light.
  What should I do when I Clean my RV furnace?
  With one screw the furnaces outer case slides off. I give everything a good vacuum and wipe down. Then inspect the wiring and electronics. I point out some of the functions of various devices and the overall workings. I check for debris in the intake and exhaust ports and squirrel fan cages.
  Why does my Furnace Fan make a clicking noise?
  The fan might make a clicking noise if it becomes loose. Clicking can also happen if soot or grime builds up on the fan blades. It’s best to let a professional deal with cleaning or calibrating the fan, especially if the furnace is still under warranty.
  Why is my furnace not working in my RV?
  If a vent inside the rig is closed or blocked with a rug and the air is restricted, the burner chamber gets to hot and the limit switch shuts the unit down. So if furnace #2 is not working, check the fuse at the distribution center, the outlets, and it could be low gauge wiring that will not send the signal at colder temps!
  Where can I buy Corsair draft inducer parts?
  Rheem Draft Inducer Assembly 70-24033-01 This is a brand new Original Equipment Manufacturer (OEM) Rheem, Ruud, Corsair draft inducer blower assembly, part# 70-24033-01. Replaces the following part #’s: 70-24033-01, A136 This part is used…
  Why is my furnace blowing warm air into my attic?
  Ductwork leaks: When ductwork has holes, it will send warm air into unoccupied spaces of your home, such as the attic or crawlspace. Similarly, cold air from the unoccupied spaces might enter the ductwork and blow into your home.
  What do you think of the rexhall RV?
  This make and model RV has been a joy to own for the past 11 yrs…. It is structurally sound, mechanicaly reliable..steering with ease. No slides-no worry! L shaped seating creates a larger living space. Quality is above avg. Did you find this useful? Really well built Coach. Had one for more than a decade. Minimal Repairs needed.
  What should I do if my RV furnace is leaking?
  Run the furnace system for a bit and watch and listen for anything out of the ordinary such as strange noises and leaks. You can use an air hose (and safety glasses) to shoot away unwanted grime and rust from the entire compartment.
  This make and model RV has been a joy to own for the past 11 yrs…. It is structurally sound, mechanicaly reliable..steering with ease. No slides-no worry! L shaped seating creates a larger living space. Quality is above avg. Did you find this useful? Really well built Coach. Had one for more than a decade. Minimal Repairs needed.
  Why does my furnace make a loud squealing sound?
  If your furnace has a belt driven motor, if this comes loose it can cause a squealing sound. Another reason for this sound could be that the shaft bearings or other moving parts are dry. When you do your maintenance checks, make sure that all the moving parts are lubricated.
  Why is my heat pump running all the time?
  If your heat pump is constantly running, there are likely three main causes: Unusually cold weather: Heat pumps are designed to work much more gradually than a furnace. It’s possible that, if the weather is especially cold, your heat pump could run near-constantly without there being an issue.
  Why does my Furnace Fan keep running all the time?
  Why Does My Furnace Fan Keep Running? When your thermostat is set to AUTO, your furnace fan should blow only when your furnace is in the middle of a heating cycle. But if your fan runs constantly, regardless of whether your furnace is heating, that’s not normal.
  What should I do if my RV furnace is not working?
  In case it is less at 10 V then one of the onboard batteries is likely to be the issue. Without adequate electricity being supplied to the furnace or the thermostat, it might not be able to fire, and the fan may or may not work at all. Consider swapping to a backup battery which can generate in excess of 10 Volts, if feasible.
  What should I do if my furnace blower is not running?
  If this does not cause the heat to come on, the heating element might need replacement, which requires the services of a professional. If the fan motor runs, but no air comes out, check the blower to ensure the belt is not misaligned or broken.
  If your furnace has a belt driven motor, if this comes loose it can cause a squealing sound. Another reason for this sound could be that the shaft bearings or other moving parts are dry. When you do your maintenance checks, make sure that all the moving parts are lubricated.
  Why is my pilot light not working on my furnace?
  Pilot light problems are sometimes related to failed safety sensors or airflow issues which causes the furnace blower will come on but not to ignite. The two place to check first are the thermocouple and the sail switch. A sail switch is essentially an on/off switch, that detects if there’s not enough airflow.
  Why does my camper furnace not stay on?
  If the furnace started, but won’t stay on, you may need to check the battery voltage. If the voltage is too low, it won’t provide enough power to keep the furnace fan running. Another cause could be a defective blower relay.
  Why is the fan on my RV not igniting?
  If it’s less at 10 Volts, then the problem is likely one of your onboard batteries. Without sufficient power isn’t being delivered to the thermostat or the furnace it won’t be able to ignite, and the fan might run slowly or not at all. If possible, try switching over to a backup battery that can produce more than 10 Volts.