LD Propane Furnace December 13, 2025, 03:53:42 pm Our furance isn’t working I’m sad to say. We have propane and the valve is open. We have propane to the stove top. We have 13V to the thermostat and the Honeywell Home shows the current temperature. I also checked the batteries in the thermostat. Everything looked good but the furnace wouldn’t come on. 10 minutes later …While typing this post, I walked back to the thermostat and for the 4th or 5th time flipped the switch. And surprisingly the furnace turned on. I can’t even guess what’s happening??? Nevertheless, how does one access the furnace if necessary for replacement? Remove the drawer above the furnace and what then?Thank you for any guidance.
Re: Propane RV Heater Reply #1 – December 13, 2025, 04:25:41 pm From Ghoulies and Ghosties and long leggety beasties, Good Lord protect us. 1 Likes
Re: Propane RV Heater Reply #2 – December 13, 2025, 05:16:54 pm Thanks Ed and Margee for the picture of your Honeywell thermostat. Just connecting the two wires together ( one red and one white) will enable the heater to start. I use a paperclip, it won't harm the thermostat, so you don't have to disconnect the wires. If the gas has been off for awhile, the furnace might need a few attempts, by your count 4 or 5 times, to succeed at starting up. First the heater turns on the fan. The same motor that circulates air inside the LD has another fan on the other end of the shaft that circulates air in from outside. This air goes through the combustion chamber and back outside with CO and CO2 in it. It has to activate the 'sail' switch before it opens the propane valve and tries to ignite the flame. If air has gotten into the propane line while sitting (turned off propane valve) the mixture may not be rich enough in propane to ignite. The heater goes into a fault mode and stops until turned off, then back on. edit: after a few tries the propane mix will contain enough propane to ignite properly and stay running. This is normal. The burners on your stove top may not ignite well until some gas has flowed, also with the water heater, and refrigerator. Don't be replacing your heater, a big mess, until there is something wrong with it. RonB (edited to be a little clearer about the symptom. RB) 4 Likes
Re: Propane RV Heater Reply #3 – December 13, 2025, 06:00:50 pm Thank you Ron for educating me on this furnace. Although I routinely turn off the propane while in storage this was the first time I experienced this problem. So I am relieved that I don’t have to buy a new thermostat or worse a new furnace.
Re: Propane RV Heater Reply #4 – December 13, 2025, 06:25:38 pm “Nevertheless, how does one access the furnace if necessary for replacement? Remove the drawer above the furnace and what then?”That’s a good question. Does Lazy Daze install the furnace and then build the cabinets around it?
Re: Propane RV Heater Reply #5 – December 14, 2025, 12:26:38 am I can only answer for my T/K floorplan. Disconnect the two fabric hoses at the heater unit. One on each side. The fittings unscrew from the unit. There is a Molex (white plastic with connector pins) to unplug from the wiring harness. Unscrew the two pipes at the back side (fresh air in--combustion air out). Disconnect the propane gas feed pipe by unscrewing it. A plug can be screwed in if you have one. I would unscrew the screen door and hinges. Then unscrew the screws holding the heater down to the floor. The unit should come out through the door opening. Reverse order to re-install. I hope to never need to do this. RonB edit: while it is out, now is the time to add some oil to the fan bearings. About the only part that will start 'squealing' once in a while. 'Lifetime' lubricated...when the lubrication is gone, it's time to replace the bearings (or motor). This link: Noisy furnace -expands on this issue. 2 Likes
Re: Propane RV Heater Reply #6 – December 14, 2025, 03:32:06 am On the older LDs, early 90s, and earlier, the furnace was installed from the outside. Later models have the furnace installed inside, accessed through the air intake door, as Ron described. I never found a bad furnace that needed to be replaced. Usually, the issue was the thermostat and its wiring, the sail-switch, or the control board. Most of the furnace can be repaired, with the exception of a burned-through flame chamber, a potential carbon monoxide hazard. Ron's suggestion to check the thermostat is the first place to look when the fan doesn't start, even though the thermostat is set to start the furnace.Larry 1 Likes
Re: Propane RV Heater Reply #7 – December 14, 2025, 03:34:03 am I have worked on a couple furnaces for my son and I found the furnace cabinet stays in place, the front cover comes off and the furnace slides out of the metal cabinet. The furnace in our Lazy Daze might be different but I don't think so. The exhaust and intake air were tricky to get hooked back up and may have to be dissembled. I did change a blower motor on a different manufacturer and I swore that I would never do it again.Jon 1 Likes
Re: Propane RV Heater Reply #8 – December 14, 2025, 09:25:47 am You might check the sail switch.If it isn't working then the furnace will not work.
Re: Propane RV Heater Reply #9 – December 14, 2025, 10:01:38 am Hi Jota; if the sail switch doesn't work, you would still have the fan running, and air circulating, but the gas valve wouldn't be allowed to open. (the lighter would still probably try to light). This to prevent fires: too much heat in one place with no air flow inside to dissipate the heat. Ed and Margee didn't specify that they had any fan action from the heater, so it may have been just an issue with the thermostat. RonB 3 Likes
Re: Propane RV Heater Reply #10 – December 14, 2025, 02:36:52 pm Quote from: Jota - December 14, 2025, 09:25:47 amYou might check the sail switch. If it isn't working then the furnace will not work.Since we don’t have access to the back of the furnace from outside, I’d still have to try to remove the furnace through the access panel, which just wouldn’t be any fun at all.
Re: Propane RV Heater Reply #11 – December 14, 2025, 06:09:42 pm Quote from: Ed & Margee - December 14, 2025, 02:36:52 pmSince we don’t have access to the back of the furnace from outside, I’d still have to try to remove the furnace through the access panel, which just wouldn’t be any fun at all.Just remove the propane line and pull lt out. I have an RB.
Re: Propane RV Heater Reply #12 – December 14, 2025, 08:26:52 pm I have a 31 IB, furnace 'accessible from the outside'. You get to cut thru what looks like 2-3 tubes of dicor. Remove panel behind lower tray beside bathroom sink. Remove panel under kitchen sink. Gumby-level dexterity and a blood-sacrifice to remove.Then discover you needn't take it out to replace the board......... 1 Likes
Re: LD Propane Furnace Reply #13 – December 20, 2025, 03:23:24 pm Quote from: Ed & Margee - December 13, 2025, 03:53:42 pmOur furance isn’t working I’m sad to say. We have propane and the valve is open. We have propane to the stove top. We have 13V to the thermostat and the Honeywell Home shows the current temperature. I also checked the batteries in the thermostat. Everything looked good but the furnace wouldn’t come on. 10 minutes later …While typing this post, I walked back to the thermostat and for the 4th or 5th time flipped the switch. And surprisingly the furnace turned on. I can’t even guess what’s happening??? Hi Ed and Margie,I just read your post and wanted to tell you I had a similar experience with our furnace. Just like you, flipping the thermostat lever to turn it on did not - but sometimes it would. We were traveling at the time, so I called a mobil service guy who, after a describing the issue and sending him pictures of the information plates on the furnace, came to the campground with a simple replacement circuit board that he installed while we waited. All in all, took about an hour because he did some testing afterward. I just removed all the drawers and he accessed the furnace from there. No removal necessary. I hope your issue is similar.Best,David G.
Topic: LD Propane Furnace (Read 596 times)
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Topic: LD Propane Furnace (Read 596 times)
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