RV Furnace REPAIR TECHNICIAN SECRETS Top 3 anyone can do PARTS BELOW
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If the info helps, donate to the channel with www.buymeacoffee.com/JOHNDANIEL - Universal Run Delay Relay amzn.to/36MXTrR Universal High Limit Over temp Switch (get 120°C/248°F Normally Closed N.C Snap Disc Temperature Switch) amzn.to/36Jtbjh
John Daniel, any ideas on a heater that only works when you pull the board plate and cover down? My guess is airflow but I’m not sure. Thanks !
Hey where is limit switch location on a suburban nt-20sq furnace
GG[oo[[[[[[
John Daniel could you please help me. Our 2000 Colemans furnace/ac aren't working. We thought wed start with the thermostat but putting a new one in had no effect and still does absolutely nothing. Doesnt even attempt to start. Please help. We are living in it now and really need this to work without a complete replacement. Thanks in advance
John Daniel, I need help trying to find the exhaust tubing that is on the inside of my furnace. Would you know where I could find it? It's 1"3/8 od by 14" long. Please help. 🙏
I like this guy he's thorough but at the same time quick he gets to the point I like that. Keep it up buddy.
Thank you for not over complicating things.
You're welcome!
This video is incredible for overall troubleshooting but c'mon people, he ain't the google machine! If you need to know where a part is on your specific model look up the schematics for chrysler sake! I found the schematics for my apartment furnace manufactured in 1972. Detailed enough for someone with zero experience to troubleshoot and rewire it. This video right here is an awesome lesson, wisdom you won't find in a manual, don't pollute it with silly questions you could find on search page 1!
I've been pulling my hair out for months trying to get a Duo Therm 66117 running in the old Skamper popup I bought last summer. I've read the manual, read every forum thread, and watched ever video I can find on these. No matter what I tried the dang thing would not run more than a few seconds before it would blow the flame out, do the single retry, then lock itself out. Unless I pulled the unit out of the camper and ran it on an external propane supply, then it ran fine. That pointed to a problem with the camper's propane supply pressure so I completely redid everything there and still the same result. I even pulled the camper's propane bottle and regulator to do the bench test and it was fine, just not when installed in the cabinet. I tested the sail switch, the gas valve, the line pressure, tried adjusting the burner pipe's intake air damper a few different ways, and nothing worked. I must have had that thing pulled out and back in six times before I realized the dang flue pipe telescopes in and out of the combustion chamber. Turns out when it was installed it wasn't quite poking all the way into the center of the direct vent fitting on the outside of the camper, and there was just enough of a gap there that as soon as the flame lit, it would start sucking exhaust gas into the combustion air intake, which would suffocate the flame within seconds. It was a bear getting the flue pipe centered and pulled all the way into the external housing but as soon as I accomplished that the heater ran like a champ. If anything at 17kBtu it's way too big for this tiny camper but I'll probably never use it for more than taking the edge off when I get up on a cold morning. I'm just glad I finally figured out what the problem was.
@@smw397 FUUUUUUUUUUUCCCCCCCKKKK hey
My house microwave has killed 2 thermal switches. I like my bacon extra crispy!!!!!! Easy to fix but they use those security screws that require the special sockets to turn them.
Good info here as I'm in the process of getting my Coach awake again after a 5 year nap while the wife and I have been fighting cancers. Just rebuilt the refrigerator that lost it's magic smoke! LOL. Wife is facing round 2 and we want to use our bus while we can. Thanks Pardner!
You fogot to mention that sometimes the sail switch will have dog hair or dust that prevents contact and a simple cleaning will make furnace work👍
I just used contact cleaner on my sail switch.
That’s what was wrong with mine last year. But I couldn’t get to it. So … I have to call the rv guy 🥴 I’m use to fixing things myself! But too old and weak now.
This is the happiest I’ve ever heard Ron White be!
You rock sir. As a semi clueless self repair person I was able to follow your instructions easily.
I may have missed an instruction about the " reset " button ? Maybe it's called one of those other names for stuff to check.
Anyhow. Your easy to follow instructions helped me find a white button . I pushed it as a last ditch attempt before yanking out the whole heater Assembly. We are back up and toasty warm again. Thank you. Also thanks to your other people comments. That was another big help. 🙃🙃🙃
This is the first video I've seen of yours and you do such a great job explaining the process. Not just what to do but why to do it. Plus real life tips and tricks. You would make a great teacher/journeyman. Thank you.
I taught over 50 Juvenile probation kids in a 12 year period, 16 and under to weld, do automotive electrical and RV repair as a condition of rehab and had a good success rate. My wifes work brought home LOL!
“Well, Dc Amperage don’t give a damn”
Is now my favorite quote 😂😂
Great video I've been having trouble with my 5th wheel kicking in no heat just shits back off... No gas at all. I think from this video it's my ot switch.
My RV sat unused inside from 2004 until this year when I bought it. Checking everything out the furnace worked initially then stopped for some reason. I pulled it out and checked sail switch and others and all checked out. Completely disassembled and cleaned an unreal amount of bugs and nest out of the heating chamber. Has worked flawless ever since and it's an older unit a 1997. For do it yourselfers your videos are a huge savings in time and money..thank you
YOU WENT WAY BEYOND NAILING IT ! YOU SUPREMELY NAILED IT !
Subscribed before the video finished...
I'm now a CERTIFIED RV furnace tech !
My board relay had fine cracked solder joints. Fixed the ignition and gas valve, but my gas valve goes poot and stops, fires and goes out. Going to check that sail switch business tomorrow. Thank you.
With a multi meter, check your active voltage conditions. Test the wire to the solenoids on the gas valve, see if after they activate, volts drop real low. Below 11. If so, you have to find where they are loosing contact to be weaker in the system. Usually carbon build up on relays is the cause.
John ,Thank You , Heater Is Running On The Test Bench ! Getting Ready To Install ! Thanks You Again !
You're super knowledgeable and a great teacher. Thank you!
Thank You. Lots of great tips on what to check before wasting money on the wrong parts. This knowledge and these skills are becoming a rare commodity in our "throw it away and get a new one world."
Never done the tip jar before but you just saved me a ton of headache…Thank you.!
John! U r the man! My 1st purchase 40 ft HR IMPERIAL..many small electronics issues. I NEED YOU BAD!!. thanks for taking the time to explain this ...now atleast I won't freeze. Im currently desperately trying to figure out and I derstand the B.I.R.D. system on This thing. I'm going. Through batteries like my ex with vibratory bats. And all the relays that are for the ignition system. 1997 holiday rambler imperial. 8.3 cummins mechanical. I bought it when my mother died and I sold everything to live ring. And It's sentimental and very comfortable.. so it's not going anywhere..thanks.
Thank you. Your the best how to fix heaters vids on internet. Simple easy to understand and i fixed mine and several neighbors heaters now. Beautiful ❤️. Your a natural at this.
Yes, it was my mother board that was defective. Changed it out, and everything worked.
Awesome thanks
Camper heater fix for dummies! Thank you for simplifying this!
Thank you there John. My great, great grandad was named John Daniel!
Thanks! Guys like yourself take explaining to a new level, a true artist!
Wow, thanks!
I can only find the over temp switch up to 190F , works the same? SO happy to find your channel
yes, just make sure your ducting is clean so outflow isn't restricted and 190 will work. But try to find a 220-240 degree still.
This is a great video, I’m mechanically inclined, but shooting in the dark for furnace/HVAC. Thanks!
Thank you very much for the brutal honest problems that can come up. I been looking for that relay switch with no luck. I have an older RV and thank you very much for your knowledge in replacing and thank you for the link.
Thanks man, I viewed 3 other sites and you my friend, have the easiest to understand and most complete descriptions of my Atwood 7900-ii issues. Fixed in mere moments.
I have one like yours. what fixed yours and could you tell me where the sail switch is and how to get to it.
Thank you from the future just in case I have issues to thing that I plan on getting I found this video looking up a 1976 Fleetwood wilderness because I'm going to go and look at 1 tomorrow Friday April 1st 2022 🤜🏾🤛🏾
Over the last 12 years working as an RV tech i have replaced 2 or 3 thermal disks, i few fan relays, now they are part of the board, but 9 chances out of 10 it is that sail switch. Good video,
Hey man if you don’t mind asking do you work for a dealer or are you mobile tech ?
I have a hydro flame model 7920. It will turn the fan on with out the thermostat being turned on and won’t shut off till I shut done the main camper power or remove wire from circuit breaker in unit. I can not figure out what is wrong . Because it was working just fine and now it’s doing this . Not sure if it’s wiring or the actual thermostat. Because I have changed almost everything other than the limit switch . If you have any advice would love to hear . Thanks ! You helped me fix my furnace the first time and now this is happening . Thanks again video really helped .
Hi John one of my propane RV furnaces squeals when first being turned on usually then it usually eventually stops is that the blower going out or what do you think that it? Thank you
You are the man!! I have found you on several different searches on accident!! Wish u were my neighbor awesome videos!! Thank you!
Absolutely the best video explaining what I had to do fix my heater on my Coleman Fleetwood popup. Thank you!
Is the blower supposed to keep running after the thermostat is satisfied
Thanks!
Yes, take a multi meter or test light and check a connection goes through them all. Before you change the board also make sure there is a spark, also make sure the spark in not shorting dut to a breakdown in the insulation as there is a lot of voltage going through it. There is also a probe inside to detect flame on some models, others use the same spark probe to detect flame )it changes the AC spark to DC and the board will lock on until up to temperature when it will go off for a while before firing up again. Check this probe is not burned away or gone brittle. The over temperature and fan change over (pressure switch) often fail. If the blower motor runs for a short while then goes off, suspect the fan switch. If it does not come on at all, over temperature switch. If the burner fires than goes straight off again, it is the spark probe of sensor probe depending on model.
If you hear clicking like a spark, look for a break in the insulation on the HT spark lead, it may look perfect, but if you lift it away from metal you might see a spark jump, or run a screwdriver (not a metal handle) along the wire, if you see a spark jump before you get to close to the spark probe, replace the lead.
If all else fails, the board may be faulty, but check everything else first, it will save you a lot of money.
Very good video . my furnace just quit now I'm not so scared to look into it . not many furnace repair people close by in my area plus I don't care to spend 100$ an hour to have it looked at. Thank you and love the dogs.
I just got three campers and I was researching heat maintenance and you are awesome.
Thanks for your help!
Cleaned our furnace and it's working.so thanks to all.
Ive had problems with sail switches in 2 rvs. Just exercised them manually and worked fine. Rv had been setting over winter and longer.
Thanks . I'm gonna try this. My fan comes on but I can't get it to heat up. So the hi therm. Seems good. It's gotta be the sail switch. I do believe I can also bypass this switch to test .is that correct.
Thanks!
What great info... I've had to change my leaf switch before. They tried to tell me it was in my board.
Thank you!! I called a mobile service. Right away, before assessing the heater he said “ohhhh it’s your circuit board and those are costly.” He wants $600 to take the whole unit out. It’s only my relay switch.
Micro Switches have a million uses. I have a bucket full of them stashed. Every dead microwave has at least two or three in it to save.
Great video John. Very helpful. Thank you very much.
Great video. Also, these are 3 of the most common fails in home furnaces.
Yes they are
Friend , your video had more info than anyplace I've looked so far. Your camera work had me fast forwarding too often. Get a tripod then you win ! BTW... Nailed the diagnosis on my sail switch ! Thanks...
Those little disk sensors can usually be reset just by throwing them against the floor or banging them on your lineman's or pliers. They are a saucer shaped disk inside that snaps the opposite way when the temperature is reached breaking the contact so with enough force they will snap back to the original direction.
As a young confused guy, this is probably the best video on this subject ever. I do have a question tho, the heater in my 1983 camper is definitely missing that circuit board (if it's supposed to have one?).
If it looks just like this one then yes it's should have one, but if it has a pilot light then it is a hydraulic action gas valve and the last of the non electric style.
@@JOHNDANIEL1 okay, mine looked similar, but is a lot older. I had later found a slightly more relevant video that helped me as well. Having watched your video, I at least can troubleshoot one of I ever get myself a new camper.
👍 Danke fürs Hochladen!
👍 Thanks for uploading!
Still at it!
Good morning John. Ok the motor was the issue so replace it put it all back together. And developed another issue so the new issue is everything will come on start blowing heat and then within a minute or two it’ll shut off the gas and no heat. I hear it clicking and will not ignite again unless I turn it off completely from the thermostat and wait about 10 to 15 minutes.
Thanks 🙏🏾
The igniter, It's allowed 90 seconds max to get up to 50mv feedback to the board if it don't the power from the relay on the board to the gas cuts off, then will off cycle till you restart it.
@@JOHNDANIEL1thank you for helping me out.
so your saying. The relay is bad? And need to replace the borad
@@GypsyDiy No, the igniter if its got one with flame sensing, more than one probe on it, it sparks in the combustion chamber and the flame will heat up the special metal on one tip and through the ground circuit will tell the board successful fire has been achieved. Your coil on your board feeds it spark, its in the burn box part. Pull it out, examine it, if it has 2 or more probes on it, replace it.
@@JOHNDANIEL1 ok will do thanks very much. Will keep you posted.
Great video BUT I have a question : my buddy has a furnace very much like this one ( could be the same model , model # 7920 - ll ) , it comes on and cycles but no hot air is blown to the inside of trailer. It DOES blow hot air out the exhaust but it shuts down and has a 3 blink red light that can be seen... what could be the problem ?
Glad to see a furnace on the bench so we can see all the parts clearly! DC may not care about amperage but wires do if they are underrated for the draw. So if you are trying to drive a 24V load with a 12V source you need to supply more current. You can probably get away with it with your relay but I wouldn't live by that rule for everything.
Such a helpful video! Just pulled out the suburban DD-17DSI from my 97 flagstaff popup and found that the sail switch/leaf switch was bad. It would show continuity when open, however, there was 500 ohms resistance across the sail switch was I think is an indicator of a bad switch. I took the wires off of either end of the sail switch and was connected them together, and everything fired right up first time. My symptoms prior to this were no spark and gas, but the fan would run.
Thank u for ur time & expertise! It’s So appreciated....
One of the best how to videos i’ve seen, John. Thank you!
Glad it was helpful!
I converted a 30 cup coffee maker into a Ethanol still simply by changing the bi metal disc switch to 175F.
Thx I’m getting hot heat sometimes...then mild heat... and a quite boom sound, like a flame going out or igniting on and off every minute or so.
Sounds like a plugged up Intake/exhaust system. Have you looked up in them from outside to see if wasp or something else is in them?
@@JOHNDANIEL1 Thanks...will do. I watched lots of vids last night and will be doing full inspection today. Only problem is it's 16 degrees out!
Excellent video
Thank you! It sounds like that thermal disk is probably my problem. We get the fan going but some clicking and sometimes and other times it fires and works. This seems like a symptom of that disk sometimes sticking, now i know how to jump it if it won’t fire to test that theory.
Thanks for the information my son in law will fix it.
Thank you.i payed 400.00 for a fan relay switch one year now I know.THANK YOU now I know.
thank you.. i have to change my rusty little part, lol but it's working now, very helpful viedo,
Replaced the sail switch in my old suburban, now it stopped trying to light (no fuel no spark) and blowing cold again. Bypassed the sail switch and no change. Gonna have to test all these bits i guess. Thanks for the video.
Manually press the sail switch to see if its just not making full contact when fire up happens. If its out of the case it can act like its not getting enough pressure, and some switches may have too small a flag on them to keep it connected the full 2 seconds the board needs to see to react.
@@JOHNDANIEL1 Hey, thanks for the reply! I've already tried eliminating it with a jumper. Gonna check the igniter for open circuit too.
Great video. Mine is in a 2008 surveyor by Forrest river. Turn the furnace on, cold air comes out of Ducts, air comes out exhaust fine after 10 seconds or less it shuts off. Only way to get it to run is to raise and lower thermostat and the same cycle continues.
When I start my furnace, it runs as it should and cycles off when it reaches temp. When the thermostat calls for it to come back on, the fan runs continuously and it doesn't try to ignite. If I turn the thermostat off and back on, the furnace repeats the same scenario. Thoughts?
The relay on my board is what happened to by furnace . Thanks for explaining the working. Unfortunately GD put the furnace in without access door, how stupid!
You can replace only the relay, but look carefully at the capacitor next to it to be sure it did not cause the fail.
Thanks for your great video. Our problem is that the furnace is not responding at all when we turn up the thermostat. How do we troubleshoot why it is not coming on? thanks!
Thank you I enjoyed your video you explain your steps very well my question is my heater would come on and then shut right back off I replace the thermostat without turning off the power to it, is there a fuse that I could have blown ? Thanks in advance David
In many there is a 15 amp board fuse, in some a 10 amp glass fuse, and in some a chassis fuse with a black screw out cover on it. But generally changing a thermostat will do no harm. Check to see if the proper terminals were connected on the back of it. Cross the wires ( direct connect them, low voltage, its ok ) and see if it fires up. If not, detail why you replaced the thermostat and maybe that is where to start.
Thank you for replying so quickly I will do what you suggested and get back with you
First, GREAT video and explanation! One crazy thing I found was one of the pins on the connector to the control board was not making contact! So now the blower turns on the furnace starts and heats but the blower doesn’t turn off after thermostat turns off. What should I look for?
Depending on the exact model of the furnace, and year made to know the more accurate cause. But 90% of these events like yours is contacts hanging up, sticking due to age. What keeps the blower on is cool down features which is a bi-metal item on the heat exchanger or next to it, or the Run Delay Relay. Using a large screw drivers handle, run the cycle and tap with the plastic handle on the case in different places to see if the fan stops. Jarring it will identify this is the issue.
If you list the model and year I can get more accurate.
Thanks for quick reply! It’s a 1998 Atwood hydro flame 7900-ii
@@rickdolunt2157 Don't sound like a thermostat issue, that is rare. The TIME DELAY RELAY has carboned up, has failed. When you disconnect power it should most of the time let go then act up when you get restarted. It would normally fail when the Limit Switch is causing shorting. So replace both ( links under video should get you the only replacement options ) and make sure you order the igniter for this furnace while doing so due to age. amzn.to/41rRDjn
Hi I Have An Old Hydro flame. Pulled It Out It Was Full Of Wasp Nest In The Fan Motor And even The Burner. Got The Parts You Suggested. More To follow !
I want to look at one today everything worked in it besides the furnace fan what would be the issue it was hot outside you can feel the heat it just was not blowing anyway you could answer that question I sure would appreciate it
Any idea where you can find an intake hose from the back fan to the burner? Thanks
Find a automotive version of silicone intake hose that will fit to replace the original burner air supply hose. EXAMPLE - amzn.to/48pdaOt
This video is 2 years old and still going strong! I have an Atwood 7916-II in my pop up camper and it won't do anything. Set the thermostat for maximum and nothing. No clicking, no nothing. Suggestions?
Connected the two thermostat wires with a jumper or twist them together to see if you get fire up mode.
@@JOHNDANIEL1 Amazing, time to buy a new thermostat. While I was prying it off the wall the furnace came one. Do you have one you recommend?
@@paulsmith50215 Stay simple! amzn.to/3rJ3bmp
@@JOHNDANIEL1 Thanks! Subscribed and bought a coffee. Maybe for a future video you could do the same for three way RV fridges that you did for RV Furnaces. My fridge runs fine on electricity and on battery but barely does anything when running on propane. Not sure if it should be this way, but the flame is so small and so blue I have to put a blade of grass in to know its running.
@@paulsmith50215 There is sometimes oily residue in the propane that can clog the lines or filter screen in the gas valve, and often the thermistor that detects the flame can shut it down to only pilot light levels due to no millivolt reading to the board. Often a tiny blockage in the output for the flame can reduce its oxygen mix. A set screw for air mix is on the tube before the flame. Any adjustments you make be sure to record so you can return to original if no changes. But I would suspect the thermostat is not seeing need for full flame and holding it back. That is the job of the thermistor in newer ones. th-cam.com/video/nVK-veCpll0/w-d-xo.html and th-cam.com/video/3m4E0X5UzW8/w-d-xo.html
Thank you for going over the basic problems / operation on the RV furnace it will help me a lot to diagnosed the problem
You are a money saver !! My overtemp switch just needed the terminals cleaned off and now we have HEAT !!! BRILLIANT ! Thanks so much . I’m Subscribed to you !!!!
Thanks for posting.
Outstanding, that's the exact furnace I have. Thank you. Was curious halfway through if you still have your eyebrows, though.
You’re great! Thank you for helping us make our lives a little easier! What an excellent video 🎉
Great video..I have an AFMD25121 FAN NOT START. Sounds like the relay? The board shows 1 blink
thank you for your help
Glad it helped
Thanks for the video John! It helped me diagnose my old Duo-Therm and the limit switch you gave a link for fixed the problem.
I have a 90’s Hydro Flame Corp. Everest Star 79/80 series furnace in my pop up camper.
When I turn it on, it just makes a whirrrring sound and the blower or hear never turn on. Any ideas?
GREAT VIDEO~~ Here's my problem. I can't get the blower to start, or anything for that matter. I do have power at the thermostat and it's calling for heat.
Sounds like failed in off position either high temp safety switch or run delay relay. Either one can prevent voltage from getting to the motor to start the process of the fire up of the heater.
Great video...why do you think my rv furnace stops before it gets to the temp i set it at??? Do you think it would be the little disk thing??
Excellent video, straight to the point. Just bought a 30 year old RV in excellent condition, very clean unit inside & out. Furnace like yours, very very clean. Was just working few days ago, now not. Fan blows, hear solenoid click, I'd get a BOOM of flame, then out & nothing more. Bypassed over temp switch. Checked sail switch (good). Opened it up, NO obstructions, very clean inside, Removed burner, checked & cleaned with Carb cleaner. Checked "jet" orifice. Any ideas???
looking in the description for the leaf switch. my furnace shuts off as if the sail switch is dirty. maybe i can clean it, but replacing might be best.
Thanks John
Hi John, where do you get the Atwood 7920-II electrode GASKET and the other rectangular gasket behind that one? And are these asbestos?
Electrode gasket ebay.us/C9LxQz MC20 Furnace Gasket Material amzn.to/43jCUZC for making numerous
I just subscribe to your channel thanks so much for the open 👀 eyes because here NC they tell me .
You need new heater .
Nice explanation for the DIY group! Thanks!
Just found your channel. Was able to get the sail switch to turn on by hitting the side of the heater. I imagine the only way to replace the sail switch is to remove the whole heater??
Yes
@@JOHNDANIEL1 Thanks John...Love your shop!!
Dude, great video. Great material and style in which you share
Wow! Thank you, thank you! Such good & valuable information! Thanks for sharing!
You now have a subscriber. 😎👍
This kinda off subject to your video but not sure if you have electric/gas option for your camper furnace or if it’s just gas. We just bought a camper and wanted to do a couple upgrades before camping season started in North Dakota. We started our electric heat and stayed warm in there all day, we went in there the second day but it was cold. This has happened twice. Have you ever had this issue before? We have not tried in on gas yet either, thanks
Seen alot of videos .quick and to the point this one was.2 👍 up
Excellent troubleshooting tips! Thanks!
God bless you. I have had a 2004 Terry Fleetwood sitting thru 69days of 101 degree temps. It's late Saturday night, freezing weather heading my way FOR 4 days and my heat will ignite, run about 10 seconds and turn back off. I can say that I am pretty well screwed. I couldn't get the parts here in time if I had to
Common for effects like that is the Flame sensor / Igniter related issue. Unit runs to light up, does not sense flame, cycles off in under 30 seconds.