Most items ship same day!. thanks lee house. Dometic has recently come out with an upgrade kit for this sail switch. Be the first to review this product. Atwood AFMD Furnace NEW Housing Sail 30121_A Motor Fan Switch BTU 30000 Blower Blower Switch 30000 BTU Atwood 30121_A Motor Sail AFMD Fan NEW Furnace Housing Dometic - Atwood 32611 Furnace Plastic Door Bezel Dometic - Atwood: $21. Low cost shipment methods available at the PPL RV Parts Superstore. 19 Foot Aluminum Sailboat Mast With Sail. It is a safety component that will not let ignition occur until it sees 75% of the motor's rpm's. Standard Flush Switch for 8100 Master flush toilets and optional switch for 7120 a 7220 Orbit. The fan air stream causes the Sail switch to close as the blower gets near full speed. Features Normal Flush switch on the left side. hydro rv flame *atwood ship furnance free sail 36680 heater switch switch heater 36680 hydro furnance free rv sail *atwood flame ship. Dealer repaired for free the slide out track with higher quality material. (normally in the off position) It gets it's name from the "sail" or paddle that is attached to the switch mechanism. Re: Furnace shuts off after 30 seconds. Repair manual Model 8531 Atwood RV furnace. It will meet your needs and deliver great. Dometic has engineered the best-in-class RV furnaces that meet high efficiency and safety standards. If the switch is flipped to the front, stove and furnace work fine. Do not start the vehicle’s engine or electric generator. Dometic 31094 Atwood Hydroflame Furnace Repl. A slow motor speed could be caused by a low battery or other low voltage cause such as a bad connection in the wiring. Fast Delivery 98% dispatched within 24hrs. Plenum plates and gaskets are available for purchase through Dometic. RV Furnaces. The sail switch acts as a safety device, making sure there is no propane flow without air flow. How to replace the sail switch and circuit board on your Dometic furnace Dometic Website: https://www. Sail switches are a common problem on Dometic furnaces. Parts by Dometic Model NDA 1402 Atwood Hydro Flame Sail Switch 36680. The heating element in the Suburban RV furnace kit arrives without ducting holes, and is predrilled for the specific furnace in the test installation. *atwood hydro flame rv furnance heater 36680 sail switch free ship *atwood hydro flame: $7. Attwood Marine Official Site. That thermo switch opens if the furnace gets too hot and shuts down the gas. Sail Switch Compatibility: Atwood AFMD25/ AFMD35/ AFMD30 Model Hydroflame Furnace. this can normally be accomplished by. Atwood Water Heater Parts. 16 24 Ships in 2 Days. I pulled my entire heater out of my RV, but didnt need to. Find many great new & used options and get the best deals for Dometic 36680 Atwood Furnace Low Air Flow Sail Switch at the best online prices at eBay! Free shipping for many products!. The heater fan turns on for about 30 seconds and then shuts off. The sail switch acts as a safety device, making sure there is no propane flow without air flow. If a sail switch is closed when the furnace tries to start the board will stop the startup and ignition sequence. Raymarine, Dickinson, Icom. *Furnace 12,000 BTU with NEW LP gas valve, sail switch, burner and temperature probe with forced air ducting to tanks *11,000 BTU A/C with heat strip and clean exhaust coils *NEW Dometic air distribution box *2 Burner cooktop *3. An RV furnace has an internal sail switch that will prevent the machine from igniting in cases of air flow being insufficient for combustion. Popularity - 5,675 views, 10. I have replaced the Limit Switch, sail switch and the spark electrode with flame sensor but need to find out why it works sometimes but not all the time. Reduced airflow can prevent the blower from getting up to speed, which keeps the sail switch from operating, which prevents the igniter from getting voltage. Marine Boat Parts For Sale. DOMETIC/ATWOOD FURNACE SAIL SWITCH AFS SERIES. Sail Switch. The sail switch is an air proving device. Atwood RV furnaces and heaters for motor homes and trailers on sale at PPL's RV Superstore. If not using a Dometic gasket and plenum plate, seal the Furnace to the hard ducting system using an approved foil tape, or use a gasket that has a 300° F minimum temperature rating and a UL94-V0 rating. Coverage for mechanical breakdowns begins after the manufacturer's warranty expires. Fast Delivery 98% dispatched within 24hrs. Dometic Thermostat Heat/Cool Analog Trailer RV Camper [S110-464105] Suburban Furnace Replacement Sail Switch SF20/25/30/35/42. Canada's largest RV parts store. Campers, RVs Boats and Motor Homes around the world use appliance Parts from Dometic. The heater fan turns on for about 30 seconds and then shuts off. IF the board has power and you don't have ingition then that is usually the problem. this can normally be accomplished by. Do not deviate from the step-by-step procedures. Atwood Water Heater Parts. Showcasing flex lifting square sail available to buy now. cause the furnace to cycle on limit and to have erratic sail switch operation. Here's how to troubleshoot that air-conditioning system. Dometic Appliance Components RV Hydro Flame Corp 31094 Sail Switch Kit Ml A world leader in designing, engineering, and manufacturing appliances and hardware for RV industry for over 30 years. 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The sail-switch is a safety device that turns off the propane if the furnace loses 12V power (no 12V power = no fan = no way for the furnace to cool itself off, so the gas still burning in a furnace that has lost power could be a dangerous situation, hence the sail-switch). *Furnace 12,000 BTU with NEW LP gas valve, sail switch, burner and temperature probe with forced air ducting to tanks *11,000 BTU A/C with heat strip and clean exhaust coils *NEW Dometic air distribution box *2 Burner cooktop *3. Today, many older recreational vehicles still use a Duo-Therm furnace to heat their interior. Shop for Dometic 36680 Sail Switch from the USA's largest RV parts online store at the best price. Atwood Sale. SUITABLE FOR AMERICAN RV. I have to pull the fuse. Atwood RV furnaces and heaters for motor homes and trailers on sale at PPL's RV Superstore. Once the flame is started the thermocouple detects the presents of flame and tells the circuit board to keep the propane valve open so that the furnace keeps running. Sail Switch on the Furnace by howson. MC Enterprises Igniter Electrode for Hydro-Flame Furnace. The sail switch is an on/off switch, which when there's not enough air flow, will stop the furnace from igniting. Get the guaranteed best prices on New Dometic with fast and free shipping. If a sail switch is closed when the furnace tries to start the board will stop the startup and ignition sequence. Suburban Sail Switch 230509 Fits: Suburban Furnace Models NT-42T. I have had the sail switch out on my Dometic Atwood and it was no problem. Another clue is the tank level indicator shows empty on the back tank even though it's full. Atwood by Dometic Hydro Flame Sail Switch 36680. Thus the switch is normally opening under full load conditions and that causes arcing of the contacts. RV SUPERSTORE CANADA 894 Van Isle Way Victoria B. If you don't smell gas, go the the next step. Dometic Furnace Model DFMD35121 Tune-Up Kit. Duo-Therm Sail Switch. How to replace the sail switch and circuit board on your Dometic furnace Dometic Website: https://www. Dometic™ (Atwood) 31093 Replacement Low Air Flow Sail Switch. It has to do with the SAIL SWITCH and the air flow that the Impellor flows to close the Sail Switch. Atwood priced for sale. When these units will not light the problem frequently is soot, dirt, or bugs in the vacuum line. Would it be an electrode problem or the circuit board. Low cost shipment methods available. Dometic tops in customer service - sticking awning fix by Yoda. Dometic Coolmatic Cd20s Compressor Drawer Refrigerator 20lt 12/24v Silver. The omission of this component allows the limit switch wires to potentially melt on the vent terminal, shorting to ground, and causing either the fuse or circuit breaker in the circuit to blow, or the sail switch to become inoperative. Regular price $13. High Sky RV Parts is not responsible for your warranty. Locate Muffler Silencer Dometic. The ease of use with this Atwood furnace makes cool-weather RVing a breeze. Until it decides to stick and fail again. Air Conditioners - What Fits Best for your RV Your comfort in your RV is a key priority, so be as comfortable as possible on even the hottest of days with one of our air conditioners. Then the ignitors start firing to get a flame going. Part number search only. 16 24 Ships in 2 Days. The sail switch acts as a safety device, making sure there is no propane flow without air flow. At BCF, you’ll find a range of insulated ice boxes and fridge-freezers designed to keep your meat fresh and vegetables crisp no matter what environment you find yourself in. Shop now!. Emits no noise or odors. Atwood 31094 Sail Switch for Small Medium & Large Furnaces. Dometic 30842 Components RV APPLIANCES Hydro Flame Corp 31094 Sail Switch Kit Ml Brand: Atwood mobile products Part Number: 31094 Sail switch Kit ml A… View More Dometic 30842 Components RV APPLIANCES Hydro Flame Corp 31094 Sail Switch Kit Ml. Dometic/Atwood small furnaces contain many features that make them an ideal choice when replacing or adding an RV furnace: Tubular design residential-style heat exchanger maximizes air distribution. Find Dometic In Stock Now. This lifts a sail switch at the front of the chamber, once this sail switch gets to a certain height, it also creates a closed circuit which tells the module board there is sufficient air flow to light and the gas valve is opened and the spark ignitor lights the burner assembly. It actually is a vacuum switch connected to the fire box by a 1/8" vacuum line. RV Parts are offered at a discount price for all RV models. A couple of suggestions for an emergency: A hard rap on a fan motor may dislodge a stuck sail switch. A slow motor speed could be caused by a low battery or other low voltage cause such as a bad connection in the wiring. IF the board has power and you don't have ingition then that is usually the problem. Dometic Igniter Electrode for Atwood - 33625. *Furnace 12,000 BTU with NEW LP gas valve, sail switch, burner and temperature probe with forced air ducting to tanks *11,000 BTU A/C with heat strip and clean exhaust coils *NEW Dometic air distribution box *2 Burner cooktop *3. I pulled my entire heater out of my RV, but didnt need to. Operates both the gas burner and the electric heating element in your water heater. The Control Circuit Board opens the gas valve and generates a spark at the DSI Igniter. Get the guaranteed best prices on New Dometic with fast and free shipping. The sail switch acts as a safety device, making sure there is no propane flow without air flow. SKU: 032033. As the blower comes up to speed, it blows air onto the sail with enough force to push the switch closed, thus allowing electrical current to flow to the next component in line. Several things can be checked for a cause in this case. I have to pull the fuse. Steveston Marine. Select your Brand and Model, then view all our parts. How to Find the Best RV Furnace. I have seen this type problem since they went to the new style sail switches and the logic on the newer control boards. You may also like 071076 Gasket kit $13. Knowing how full your holding tank is can mean more than simple peace-of-mind. Find the Camping & RV Furnace Parts you need. SUPER FAST SHIPPING. Dometic's are real picky about having the air intake/exhaust tube in place. Maybe it's rusted, or there could be an insect nest somewhere inside of it. Great service, low prices, fast shipping. Until it decides to stick and fail again. Please view the manufactu. You've spent the last two days geting the boat wife-ready and now, after an unanticipated delay at the office, you are on your way to the marina. Don't let the dog days of summer make you swelter. Atwood 31094 Sail Switch for Small Medium & Large Furnaces. Fast & Free Shipping! Save honeywell sail switch to get e-mail alerts and updates on your eBay Feed. If the switch is flipped to the front, stove and furnace work fine. After reading numerous of articles/forums/manuals I started troubleshooting and found out that limit switch (don't confuse it with sail switch) is not working, therefore blocking. Buy online today!. Re: Furnace shuts off after 30 seconds. If a sail switch is closed when the furnace tries to start the board will stop the startup and ignition sequence. Engineered for easy maintenance and excellent air delivery, our lightweight products are compact and reliable. Shower allows water to run out at both ends after it runs down the wall. Do not touch any electrical switch, or use any phone or radio in the vehicle. The sail switch is an "On" and "Off" switch that normally stays "Off". Until it decides to stick and fail again. *atwood hydro flame rv furnance heater 36680 sail switch free ship *atwood hydro flame: $7. WARNING: This product may contain one or more chemicals known in the State of California to cause cancer and/or birth defects or other reproductive harm. Any instructions or schematics for doing the repair I'm traveling. Find the Camping & RV Furnace Parts you need. Sail switches can malfunction because of blocked return air grills, blocked or restricted ducts and registers, dirt on the sail switch paddle (weighing it down), and or a bent paddle. For You Explore. Duo-Therm All products All products 110-120V 110-120V Inputs 12VDC 3" 5" Diameter 5-1/2" or 5-5/8" Diameter Auto Duo-Therm Manual Nordyne Pilot Sort by Featured Best Selling Alphabetically, A-Z Alphabetically, Z-A Price, low to high Price, high to low Date, new to old Date, old to new. Dometic appliance replacement parts from RVpartsexpress make repairs a pleasure. Atwood by Dometic Hydro Flame Sail Switch 36680. Dometic Replacement Furnace Low-Air Flow Sail Switch 31093 Replacement Furnace Low Air Flow Sail Switch by Dometic. If the switch is flipped to the front, stove and furnace work fine. Add to cart. Sailboat Main Sail Mast Track Slides 34wide A008 New Strong Sail On Sailor - $1. Campers, RVs Boats and Motor Homes around the world use appliance Parts from Dometic. Dometic Igniter Electrode for Atwood - 33625. It insures that the combustion wheel is rotating fast enough so that there is a proper air and gas mixture for smooth ignition. twice in the last 2 years the furnace would fail to operate. The omission of this component allows the limit switch wires to potentially melt on the vent terminal, shorting to ground, and causing either the fuse or circuit breaker in the circuit to blow, or the sail switch to become inoperative. Duo-Therm Sail Switch by MC Enterprises®. The sail switch is an "On" and "Off" switch that normally stays "Off". Sail Switch on the Furnace by howson. DIP switches are an alternative to jumper blocks. , 1969- of historic interest, covers every model from the Dometic introduction in 1958 to 1969. Duo-Therm Sail Switch. Any instructions or schematics for doing the repair I'm traveling. Add to Cart. Atwood 31094 Sail Switch for Small Medium & Large Furnaces. He is now on his way to Utah with confidence in his furnace as temperatures look to be 19 degrees. A good way to test the furnace operation though a pain is to find the two blue wires going into the furnace. (normally in the off position) It gets it's name from the "sail" or paddle that is attached to the switch mechanism. It actually is a vacuum switch connected to the fire box by a 1/8" vacuum line. How an RV furnace operates If the thermostat in your RV controls both the air conditioner and the furnace, be sure the switch is set on "Heat. Atwood Hydro Flame 31093 RV Heater Furnace Sail Switch 31963 $9. Widest variety of worlds 3503 made and many relevant items. An RV furnace has an internal sail switch that will prevent the machine from igniting in cases of air flow being insufficient for combustion. 99% of the time you have a defective sail switch, that is sticking and cannot close from the air. WARNING: This product may contain one or more chemicals known in the State of California to cause cancer and/or birth defects or other reproductive harm. Do you want to remove all your recent searches? All recent searches will be. How to Find the Best RV Furnace. Atwood Furnace Parts and Equipment. Mounts to the wall in your coach for easy access. 89 Add To Cart. Buy D1110002 Premium today! Featuring our huge collection of D1110002 Premium available on sale!. Maufacturer #232261. Do not touch any electrical switch, or use any phone or radio in the vehicle. rvrepairmanual. How to Troubleshoot an Atwood Furnace By Turn the furnace on to a set point above the current temperature and turn the main switch to "On" or "Auto" if the. 29 Sale View. *atwood hydro flame rv furnance heater 36680 sail switch free ship *atwood hydro flame: $7. Suburban Sail Switch 230510 Fits: Suburban Furnace Models NT-24T and NT-24S. how to adjust the sail switch on a electric dometic toilet on a 2008 alegro bus. Free Postage. The motor has to spool up and close the circuit on a small switch called a sail switch behind the blower wheel cover. Buy Dometic 31093 Sail Switch for Small & Medium Furnaces from Walmart Canada. It is a safety component that will not let ignition occur until it sees 75% of the motor’s rpm’s. Sail Switch on the Furnace by howson. PLAN STARTS: Plans start date of purchase. Miss Dixie Yacht for Sale is a 42 superyacht built by Manta in 2006. Once the flame is started the thermocouple detects the presents of flame and tells the circuit board to keep the propane valve open so that the furnace keeps running. A highly impressive 41 l fridge or freezer with easy operation and capable of heavy-duty operation. Normally, I check the sail switch thoroughly every week just to make sure it functions properly. If you are hunting for Fuse Panel, you have come to the ideal place. If you don't smell gas, go the the next step. The sail switch can malfunction, or just go bad. Showcasing worlds 3503 made available for purchase today on the internet!. Atwood Furnace Won't Ignite. Oct 01, 2015 · How to RV Furnace Repair Sail Switch Lighting Procedure-+ Dailymotion. If I had a Dometic furnace I would also have a thermal breaker switch. Home » Atwood Water Heater Parts. According to the model and manufacturer, there is a limit switch on one side or the other of the sail switch. DOMETIC 33063 Kit Svc Sail Switch Df F. 53) Sealand dometic fluch ball seal part #385311658(US $9. The blower and propane solenoids are working fine and I'm getting a 63-65 volt reading on the igniter wire using a digital voltmeter (with the igniter wire connected at both ends). Do not deviate from the step-by-step procedures. Maufacturer #232261. It is probably the reason it won't ignite, but you can check for power through the sail switch and the limit switch into the board. Add to cart. Turn the valve power switch to the ON position. Find Muffler Silencer Dometic for sale. Then smell for gas, including near the floor. Dometic/Atwood small furnaces contain many features that make them an ideal choice when replacing or adding an RV furnace: Tubular design residential-style heat exchanger maximizes air distribution. I would replace that due to the age and unreliability of that board. After replacing the sail switch my furnace works perfectly! Also, of note, on my heater model the sail switch was mounted inside of the fan enclosure. Maufacturer #232261. The limit switch is a normally closed switch in series with the sail switch and the thermostat. parts quick reference q our complete parts listing begins page 609 553 coleman-mach air conditioner parts additional ceiling assembly repair parts can be found on pages 561-566. Although it always works when not plug in. If you smell gas, STOPI Follow under FOR YOUR SAFETY READ. *Furnace 12,000 BTU with NEW LP gas valve, sail switch, burner and temperature probe with forced air ducting to tanks *11,000 BTU A/C with heat strip and clean exhaust coils *NEW Dometic air distribution box *2 Burner cooktop *3. For You Explore. Add water and Dry Bowl flush on the right. Pressure activated switch, that flushes as long as the switch is pressed. It worked fine last night but today it powers up and the fan runs, but the burner never kicks on to warm up the forced air. Here at RVpartscountry. Water heater user manuals, operating guides & specifications. Sail switch defective or wire off 10)Limit switch defective or off wire 11)Edge connector on cicuit board dirty. 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. This is a replacement sail switch for select Atwood AFS Series Furnaces. Dyers RV will be closed Thursday November 28th through Sunday December 1st. I have a 2015 reflection with the atwood furnace. It's robust, efficient and ready for action, the CFX is our most awarded product and you'll quickly understand why. The sail-switch is a safety device that turns off the propane if the furnace loses 12V power (no 12V power = no fan = no way for the furnace to cool itself off, so the gas still burning in a furnace that has lost power could be a dangerous situation, hence the sail-switch). The Control Circuit Board opens the gas valve and generates a spark at the DSI Igniter. 19 Foot - $399. Replaces the double-panel on/off switch that came with your Dometic water heater. Dometic Igniter Electrode for Atwood - 33625. 98 Sale Burner for 79XX-II. Operates both the gas burner and the electric heating element in your water heater. As a result, the vent will work, but no heat will be produced. Features Normal Flush switch on the left side. We have plenty of options available such as non-ducted ceiling assemblies, Coleman MACHs, Coleman Roughnecks and the Coleman park model as well as all the parts and accessori. The Girard Group offering RV Awnings by Girard Systems, tire shades, TV boxes and voice activation systems by Girard Guard, and tankless RV water heaters by Girard Products. Suburban Sail Switch 230509 Fits: Suburban Furnace Models NT-42T. Additional options available with full site access. Select your Brand and Model, then view all our parts. It worked fine last night but today it powers up and the fan runs, but the burner never kicks on to warm up the forced air. They also cleaned the burner, checked the electrodes & blew out all. Our Recommendation Can Help Finish Your Dometic Components RV APPLIANCES Hydro Flame Corp 31094 Sail Switch Kit Ml Shopping Woes. The sail switch ensures that there is proper air flow from the blower before "closing" and sending 12VDC for ignition. Do you want to remove all your recent searches? All recent searches will be. Page 3, Any switch that you can think of for your RV. Atwood Parts. Low cost shipment methods available at the PPL RV Parts Superstore. Also, check the condition of the ducting. Get the guaranteed best prices on New Dometic with fast and free shipping. Duo-Therm 24 Volt AC Module Board. Add to cart Dometic Atwood 31094 Sail Switch Kit. *ATWOOD HYDRO FLAME RV FURNANCE HEATER 36680 SAIL SWITCH FREE SHIP Fits Models: 85XX-II / III / IV & LD89XX-I / II / III & LD, 1522 / 2334 / 2540 2-Stage series. Add to Cart. Suburban Sail Switch 230509 Fits: Suburban Furnace Models NT-42T. I have a 2015 reflection with the atwood furnace. service manual 12vdc wall thermostat air conditioning systems rooftop units only to prevent the possibility of severe personal injury, death, or equipment damage due to electrical shock, always be sure the power supply to the appliance is disconnected before doing any work on the appliance. It will meet your needs and deliver great. After replacing the sail switch my furnace works perfectly! Also, of note, on my heater model the sail switch was mounted inside of the fan enclosure. Happy Thanksgiving!. Shop for Dometic 36680 Sail Switch from the USA's largest RV parts online store at the best price. Atwood by Dometic Hydro Flame Sail Switch 36680. This is a replacement sail switch for select Atwood DF Series Furnaces. Secondly is a bad sail switch ("air-prover"). Problem solved. Featuring 560204 Sail for sale today online. com FREE DELIVERY possible on eligible purchases. White Rodger. View & download of more than 332 Atwood PDF user manuals, service manuals, operating guides. Do not touch any electrical switch, or use any phone or radio in the vehicle. Dometic 31094 Atwood. Find the Camping & RV Furnace Parts you need. Duo-Therm Sail Switch. (normally in the off position) It gets it's name from the "sail" or paddle that is attached to the switch mechanism. Sail Motor Part Boat Engine Deck Boat Engine. It is probably the reason it won't ignite, but you can check for power through the sail switch and the limit switch into the board. Discover clearance sale on Switch Switch we carry wide range of Switch Switch. SUITABLE FOR AMERICAN RV. V9B5R8 Tel: 1-866-530-6527. Atwood Furnace Won't Ignite. service manual 12vdc wall thermostat air conditioning systems rooftop units only to prevent the possibility of severe personal injury, death, or equipment damage due to electrical shock, always be sure the power supply to the appliance is disconnected before doing any work on the appliance. Multiple duct options are available. Atwood Sale. Until it decides to stick and fail again. Dometic understands RVs come in many different sizes. A good way to test the furnace operation though a pain is to find the two blue wires going into the furnace. Duo-Therm Parts (all) Furnace parts for Duo-Therm mobile home and wall furnaces. (normally in the off position) It gets it's name from the "sail" or paddle that is attached to the switch mechanism. A furnace contains an internal sail switch, that senses the air flow. The motor may be getting weak from old age and worn brushes. Atwood Parts. SUITABLE FOR AMERICAN RV. Kit,svc Wheel Evap Blwr. Add to Cart. IF the board has power and you don't have ingition then that is usually the problem. Buy Dometic 31093 Sail Switch for Small & Medium Furnaces from Walmart Canada. Free shipping available for orders over $99. Dec 13, 2011 · Keep in mind some home furnaces (NG or LPG) use the equivalent of a sail switch in the burner compartment to sense exhaust air flow. The upgrade kit includes sail switch 33063 as well as an upgraded sail switch bracket. Duo-Therm Sail Switch. Shore Station Computer Control Black Box Relay Switch Sensor Boat Hoist 5310324. You cannot see it without removing the cover as it is fastened to the back. Add water and Dry Bowl flush on the right. twice in the last 2 years the furnace would fail to operate. Atwood by Dometic Hydro Flame Sail Switch 36680. *atwood hydro flame rv furnance heater 36680 sail switch free ship *atwood hydro flame: $7. Clothing or other flammable material should not be placed on or near the appliance. Add to Cart. Jul 24, 2011 · how to adjust the sail switch on a electric dometic toilet on a 2008 alegro bus. Suburban Sail Switch 230509 Fits: Suburban Furnace Models NT-42T. Maufacturer #232261. No matter what model of an Atwood furnace you might have, we have a wide selection of Atwood Furnace Parts so you'll be able to find the perfect addition to your furnace. The sail switch is an air proving device. Best prices, Free shipping for orders over $99. The sail-switch is a safety device that turns off the propane if the furnace loses 12V power (no 12V power = no fan = no way for the furnace to cool itself off, so the gas still burning in a furnace that has lost power could be a dangerous situation, hence the sail-switch).