Results for "afmd35"

Staring at my Atwood AFMD35 manual that claims it should stay running once lit, but mine keeps shutting off every few minutes like it's playing peek-a-boo. It fires up beautifully for about 5-10 seconds, gets my hopes up that I won't freeze tonight, then promptly shuts off like it's having second thoughts about this whole "heating the RV" thing.

I've ruled out the sail switch and high temp limit since it actually lights (small victories in RV life, right?). I'm pretty sure the flame sensor is the culprit here, but I've never cleaned one before. How do I clean this mysterious little part, and what's the best way to access it on this model? Because apparently my furnace thinks playing hard-to-get is charming! …more

Staring at my RV furnace blowing cold air at 2 AM with the fan running — desperately need this fixed before morning hits.
I can hear it trying to ignite but it never actually lights. What are the most common causes when a furnace won't ignite? Need to know what components to check and how to diagnose ignition problems myself. …more

The YouTube tutorials I followed to fix my Dometic DFMD35111 furnace that runs 10 seconds then dies actually made it worse—now it won't even start! Every time I try to run it, the same thing happens - it fires up, runs for exactly 10 seconds, then just shuts off completely. This has been going on for weeks now and I'm getting desperate since the weather is getting colder.

I've been trying to troubleshoot this myself but honestly don't know where to start. I can hear the blower running and the unit seems to ignite initially, but then it just dies. Is this a common problem with these Dometic units? I'm really hoping this is something I can fix myself rather than having to call out an expensive repair tech.

What are the most likely culprits when a furnace runs for just 10 seconds then shuts down? I need to know what components to check first before I start taking things apart. …more

The multimeter's charged and screwdrivers are laid out — ready to fix this Suburban KT30 Furnace 521099 circuit board myself, just need the proper wiring sequence. I upgraded my Suburban KT30 furnace with the new 521099 circuit board and 528039 adapter harness after the original board failed. The good news is I now have power to the gas valve through the brown wire - that part's working!

But here's what's driving me crazy: when the gas valve opens, I'm only getting ONE spark at the electrode instead of the continuous 5-7 seconds of sparking I should be getting. I've been digging through wiring diagrams and realized the old board had a dedicated wire for the flame sensor, but the new setup just has me grounding that old flame sensor wire.

I'm pretty sure this flame sensor wiring issue is what's causing the single spark problem instead of continuous ignition, but I can't figure out how to properly wire it with this new 521099 board. Has anyone successfully done this upgrade and gotten the flame sensor circuit working correctly? …more

Three days after hitting that brutal stretch of pothole-riddled interstate, I've been getting a strong propane smell coming from behind my RV refrigerator, specifically a Norcold model. While parked at my brother's place in North Dakota, I discovered a leak in the fridge's gas valve - specifically around the manual shutoff area.

What's the safest way to locate the exact source of this propane leak? I've already used a sniffer and bubble test, and replaced the original valve, but still hear a slight 'pfft' sound when reopening the propane tank after 15+ minutes.

I noticed something interesting: when actually using propane for cooking or driving, the leak smell seems to disappear. Could this indicate a very minor leak that gets redirected when gas is flowing?

What are the recommended steps for thoroughly diagnosing and fixing such a small but persistent propane leak? …more

Already spent my RV repair budget this month — is there a way to fix my furnace that just clicks instead of igniting for under $50? The thing keeps making clicking sounds like it's auditioning for a marching band, but refuses to actually ignite and warm up our rolling icebox.

I'm hearing all this clicking and anticipation, like it's really trying its best, but then... nothing. Just cold air and the sound of my dreams of cozy RV evenings slowly dying. Is this a sail switch throwing a tantrum? Bad igniter having an identity crisis? I need some troubleshooting guidance before I resort to wearing all my clothes at once like some kind of mobile marshmallow! …more

My Dometic DFMD35111 furnace does the same infuriating thing every fall — lights perfectly on startup then immediately dies out. The flame lights up no problem, but then it just dies out randomly - sometimes after like 3 seconds, other times it'll run for several minutes before cutting out. It's totally unpredictable.

I've already cleaned out some bugs from the burner area and messed with the sail switch, but it's still doing this intermittent thing. The flame sensor looks pretty gunky though. Could that cause these random flame failures? And what else should I be checking when the burn time is all over the place like this? …more

After three trips to the RV parts store staring at furnace components with absolutely no clue which one will actually stop my Atwood 8525 from reeking of propane. After replacing the burner assembly on my 2002 Holiday Rambler's Atwood 8525-iv-dclA furnace (which is one of two furnaces in the coach), now it smells like propane inside the RV when it's running. Zero leaks when it's off, but fire it up and suddenly my rig smells like a gas station.

I'm pretty sure this falls under the 'this could kill me' category of RV problems, but I'm not entirely sure what I messed up during the burner replacement. Could this be a safety issue with how I installed the burner, or am I looking at something more serious like a cracked heat exchanger? What are the main causes of propane smell from these furnaces during operation? …more

This 1998 Holiday Rambler's Atwood 8535-III is dying and I can't swing a $300+ service call — any DIY replacement options under $200? It's been repaired multiple times over the years, but now it's getting rusty and parts are nearly impossible to find. I'm worried about safety issues if I keep trying to patch it up.

I really need to replace it with something reliable, but I'm nervous about compatibility issues. Will a newer furnace even fit in the same space? Are there any direct replacement options that won't require major modifications to my RV's heating system?

I'd feel much better having a proper replacement recommendation rather than guessing and potentially creating bigger problems. What are my best options for replacing this old Atwood 8535-III? …more