How to Troubleshoot your RV Furnace Circuit Board
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- čas přidán 15. 07. 2024
- This is a video about How to Test Your RV Furnace Circuit Board.
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0:00 How to Test Your RV Furnace Circuit Board
00:25 Getting To Circuit Board
00:25 Prep
03:19 overview
04:29 power
05:35 Thermostat
07:13 Blower Motor
10:12 Air
11:17 V1
12:10 ignitor
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RV, Camper, Fifth-Wheel, Motorhome, Fleetwood Flair, RV Maintenance 101, Mobile RV Tech, Las Vegas, Henderson, Summerlin, Nevada, RV Repair Technician, Save money, Save time, Certified RV Repair Tech, RV Tips and Tricks, NRVTA, National RV Training Academy, Water Heater, Dometic, Atwood, RV Inspector, RV Inspection
You Rock Girl!! Very good
Excellent and informative video 👍
I’ve been trouble shooting my Atwood 8500 IV (4) the last few days. Bought another board….no change. So I did what I should’ve done to begin with and followed the wire paths. Discovered a shorted wire from rooftop unit to furnace. Cut an access hole(s) (4) and fortunately found a mouse had chewed through the wire. Repaired the wire, put the original board back in and presto! Back to working! I enjoyed your video. I’ll be watching more of them! Keep them coming….please.
Thanks for this video, I've been trying to figure out the pinout on that board for two days. Hero for the day!
I have learned so much about my Rv by watching you thanks for all the helpful information you provide. I'm a female living FT with my partner in our RV. I do all the maintenance myself. We had our furnace stop working and I fixed it. Thanks again keep up the wonderful helpful things you do God bless ❤
Hey, I've been researching Atwood furnace repair videos for 2weeks and just found your channel. Super excited to see a lady making content 🙌 I've just started my RV journey on the north east and was operating under the assumption that I could slowly repair things over the winter, until.... My furnace died. RV techs out here have already gone south for the winter or charge $300 just for the first hour. Contemplating replacing the entire furnace for that rate and getting my own RV repair cert ASAP. I'll be living in your channel for near future from now on 😅💗🧑🔧
Great information, awesome detail. Thanks Don
Great job and advice for us....I appreciate it!
Great job 😊
Thank you for the explanation and what the voltages should be. Extremely helpful video!
Very good video Emily. You have the gift of teaching.
Thank you for the video.
That means so much to me! Thank You!
I feel she'd be a good kindergarten teacher. ❤
Great video explaining the circuit board and tracing the power flow - thank you
Awesome video. Very well explained.
Glad it was helpful!
@@rvrepairwoman Unfortunately the new PCB shows the same symptoms. When it switches to heat I hear a humming noise and do not get 12V on the Blower pin. After a few seconds the diode starts blinking for the air flow/limit fault error. Now I wonder if that humming noise is normal?
I did that also, put everything back together. It tried to light and shutoff with 1-2 seconds but instead of needing to reset after 3 failed attempts it kept on trying and after about a dozen attempts it stayed on. It has worked just fine since then. Thanks for your channel, we are subscribed, it is very apparent you know what you are talking about.
RVrepairwoman, you are amazing! I have spent days online trying to learn how to troubleshoot my RV furnace, and then I watched your testing a circuit board video and your how an RV furnace works! I am now ready to troubleshoot my furnace! And it's going to the the limit switch or the circut board! Thank you so much. And, yes, do a video on tearing a furnace apart. You can use my 20 old Atwood 8500-IV, please!
Got my folks RV furnace sorted out due to your information. Main board replaced, old one had some swollen caps. Thanks for your help!
Thank you :) best video that i could find so far explaining every point of the board awesome... Thanks ❤
Glad it was helpful!
I agree! Wish found out this video last week!!
great video!!! thank you for taking the time to make this... very well explained.
Glad it was helpful!
I also have been troubleshooting my domestic furnace. Just found you after watching numerous other videos. Your video on the circuit board was the most informative that I’ve watched . Keep up the good work and I will be watching more. Thanks! Liked and subscribed!
Glad it helped!
Emily, you rock! My furnace would make a clicking sound when I turned on the thermostat and the red troubleshooting light on the circuit-board would blink one time. I found your video, troubleshot the circuit board per your clear and concise instructions and found out I was not getting power to the fan. I ordered a Dinosaur replacement board, installed it, and now my furnace works again! You're a very knowledgeable and talented woman...thanks for sharing it with us.
THIS is what I made this video for! So glad that it helped someone out!
Awesome job! Really in depth video
Glad you liked it!
One of the better videos out there about these furnace boards. My board ended up failing so I put in a dinosaur board. Now all my problems are gone. Highly recommend that board. Also look into buying some wire piercing probes. They’ll save you a ton of time . Just tighten the probe into the wire and connect your meter to them.
OMG! You BLO 😂 my mind. But seriously, thanks for a great channel. I Christopher Columbused you last week and have been watching your videos non stop. I'm learning so much good stuff from you
❤️love finding other people that like to geek out over this!
you are the best i have o on both top and blower ordering a board today... and by the way love the overalls
Awesome! Thank you!
13:26 Emily!! Great video. Passes tests to this point - Sail switch good but no motor / audible click on board but never runs. Motor Spins freely. Maybe limit switch?
Going new board route -
Thank you so much for this video series.
New follower. I love the videos, I figure that you have saved me at least $$1000 in repair costs thus far. Thanks .
Glad to help!
Very good all in one site. Thanks. You help me anticipating future faults. Ones I can’t blame on the dog.
I thought I was good at repairs but once found after taking my camper apart; trying to find why I lost 120AC to 1/2 the camper.
Finally found the gfi reset button in the wash room tripped. I couldn’t have imagined it was wired to 1/2 the camper outlets.
Live and learn. (Ground fault interrupter)
Oh my god you would be surprised how many things get wired with the GFCI. And it’s not consistent from RV to RV.
Great video. No one on CZcams talks about troubleshooting to the circuit board. Thanks.
Here are 3 things you may want to make videos about. I have an Atwood 7920-ii in my 2004 lance truck camper. I have had trouble for the last few years. Replaced every part except for the sail switch. Its still working fine though. This year i got trouble again. I want to replace the sail switch and clean out the dust, dirt and stuff in there and around the blower motor and thoroughly inspect everything.
1. How do you get the exhaust pipe out?
Every video shows it pulling right out after removing the screws and sealant outside. Mine seems rusted in place. No help from the manuel. Sail switch and blower are in the back and not accessible until i can pull the furnace out.
2. How do i set the ignighter electrode to burner spacing?
Once i install the electrode, there is no way to see the spacing from the electrode to the burner.
3. Is there a life expectancy to these furnaces?
One video i watched had a crack in the heat exchange chamber. Im wondering if i should stop trying to fix this old thing. I wish i could get it out to thoroughly clean and inspect it.
The current problem i have is it doesnt light. One flash on the led. Blower turns on and blows strong. Electric makes it through the safety stuff. Gas valve opens. Igniter clicks but sounds weak. Turns off after 3 tries. 2 years ago i replaced the electrode, burner and nozzle. Worked great for several months. Then stopped working. Spark sounded weak. Replaced circuit board. Problem solved. Strong spark and quick ignition. Worked good last winter. This year the spark sounds weak again and one flash on the led. First circuit board lasted 14 years. Im on my 3rd replacement in 5 years. Last one was the dinosaur board. Im so disgusted and tired of the unreliability. Im on disability and I dont have much money but i cant help wondering, have the new rv furnaces become any more efficient and reliable in the past 20 years? If so, i may consider getting a zero interest credit card and purchasing a new furnace. Any suggestions?
Thanks in advance if you can find the time to answer and happy holidays.
Steve
Good video! My Atwood furnace blows cold air only I feel confident i can troubleshoot after watching this video. Thanks and wish me luck. It's 0 degrees with a wind chill of -30 so thanks again
Get warm dude! *fingers crossed*
Very helpful video….much better than others I’ve seen on line. I’m off to do the CB test and will let you know how it turns out. FYI, I suspected a faulty high limit switch but will feel better going through these tests before removing the blower cage to access it. I have an intermittent 15 sec on/15 sec off issue with the burner in my 1995 Atwood 8520 furnace. Will be replacing the burner today also.
Intermitent problems are the WORST! It always starts working again right as you’re about to get to the bottom of the problem.
Very informative Great job
Glad it was helpful!
atwood 8535-iv replaced everything, sail ,limit , igniter, mother board , cleaned inside and out , it will not get passed sail switch, so i tied a fishing line to it ,drilled a small hole turned it on pull the fishing line a ND bingo it started right up , why does the blower not strong enough to trip the sail switch ? Thank you o@@rvrepairwoman
Hey Great video. I have an rv furnace that cycles through the start up but doesn’t lite. I do not hear the tick tick tick. I noticed the led light does not flash. Do you have a video on checking the igniter? Or would it be the capacitor that feeds the igniter? Again you are very informative and I plan on watching most if not all your videos.
Another outstanding video Emily! Have you thought of doing a telephone or on-line consulting business? I'd bet that there are a lot of folks who could use someone to call with a problem. For example: My xxx is working. I've done xyz. Is it the a, b, or c........ Then hook the caller up with the fastest place to identify /find/ship the needed part. I'd think that you could get a lot of business if folks had someone to call and confirm their problem before they roll a mobile tech.
Great troubleshooting video! I just replaced board in my suburban furnace, solenoid clicked when thermostat set to high temp but no voltage from solenoid on BLO wire. I assumed sail switch circuit would not allow solenoid to click if either were bad. New board fixed the issue. I went with Suburban board for twice the 💴 than an Amazon board, not sure how those will hold up.
I just graduated from NRVTA. I believe you went there as well if I am not mistaken. You diagnosed things a little bit differently, but it was refreshing and nice to see there are other ways to testing a furnace circuit board. Keep up the good work and love your videos.
Oh cool! This was how I was thought at the NRVTA. How were you guys taught different? Always love a new way to look at things.
No voltage on the V1 pin was my problem with no ignition. I jumped the first pin straight to the gas valv and 💥 i have heat!! I did try and time it with the igniter lol i was a bit off and got a whoof!! Thanks!!!
YAS! Love to see it!
I like your videos and have subscribed.... I need a way to secure my power awning during travel....thoughts?
Great informational and detailed video!
I tried each of your tests on my circuit board because I’m seeing an E1 error on my thermostat control unit. The CB gets power, but I’m afraid the control unit isn’t connected to the CB somehow because of the E1 error. I’ve disconnected my batteries, swapped the control unit and the CB, in your experience what’s the issue and how do I troubleshoot this error?
OMG, amazing!! I am trying to fix my 8900 Hydroflame and I have 12v power all the way up to my board and out to the breaker and on/off switch I tested my 60704a0-42 relay and I could not get the relay to shut from the application of 12v power even directly connected to my truck battery.
I am trying to find the replacement for the relay and all I can see s the dinosaur one.
what would be your suggestion?
I order dinosaur boards all the time and their customer service is top notch.
Emily, awesome videos. We have no voltage on the brown but our fan motor is running constantly and furnace won’t ignite. Help, please.
Volts only the the PWR Spade. Checked at the A/C where they connect and I have 12v on both wires going to the thermostat and 12v coming back from the thermostat. It connects to a blue wire that I assume goes to the board. When calling for heat shouldn’t I have 12v at the TH pin on the board? Hope this makes sense.
I have intermittent issues with with my sf-30f...so far I've switched out all the parts except for the circuit board and the gas valve. My question is: do these valves get sticky? My heater would be working, then turn off like it normally would when the desired temp was reached...then it wouldn't fire back up. Blower and everything comes on like normal, doesn't ignite so the air doesn't get warm. Could the problem be the valve not opening so there's no gas to ignite. It seems like i keep getting it to work and then after cycling it won't fire up again.
Help!, I've changed my circuit board and a good sail switch. 0 volts on my thermostat?
Great video, thanks. My furnace will start, gas lights, however turns off after 1-2 seconds, will duplicate 2 more times and then shutoff. Thoughts?
Oof those ones are tricky. I'd try cleaning and checking the gap on your ignitor first. If that doesn't fix it. Try replacing the ignitor.
I set the T-stat, the fan comes comes on but, no power to board at all. I tested all three wires and they’re dead. So I’m getting no power to the board. I have tested every fuse. It also appears there is plenty of air flow. My furnace is a year 2000 Atwood furnace. Any input would be appreciated.
Hi, I am not receiving 12 V to my circuit board from the thermostat. Could the fact that I installed a heat pump on the roof be part of my problem?
I am freezing out here ...if I am getting 12v to the board and my blower motor is tested . And nothing happens is there a good chance it is circuit board ?? If so I will just order one. The thermostat is tested as well
I have a suburban sf30f furnace. I did all the proper tests and the solenoid clicks and does not have power to the blower motor. I replaced the board with the updated version and the solenoid does not click and no power to the blower. I checked the sail switch and the overheat switch or whatever it's called and they are good. So how often are new boards bad? If not what else could it be?
Hmmmm that’s a tricky one. It’s rare that a brand new board is bad but it does happen…
Any chance that you do business out of Las Vegas? I need a furnace pro.
Where are you based? I'm physically in LV but I do drive to Boulder City and Pahrump on occasion.
can you tell me if I need propane turned on before I start my furnace blower? I realize there will be no gas flow etc but just want to know if the system has to show pressure before it will let blower kick on. I am trying to troubleshoot my system and it comes on intermittently.
You don’t need the propane turned on. The blower fan should still act as normal, you’ll still hear click tick tick tick. You’ll just never light.
@@rvrepairwoman thanks for your reply my issue is I can go out there and turn on heat and adjust thermostat up and hear the click in the AC unit above and then blower will not even turn on and another day I can go out there and poof it works.
Hey. So I’m having an issue with my furnace shutting off after running for about 5 minutes. I took the outside cover off and reset the furnace and it instantly turned on I left the cover off for a few minutes and it stay on. It shut off again a few minutes after I put the cover on. If you have an idea what may be causing it that would be greatly appreciated.
Here are my shot in the dark thoughts since I can't be there to look at the furnace:
1. Is there any chance the room has gotten to temperature? The furnace isn't going to continuously run, it will stop once the room gets to temp. Crank the thermostat to 90 and see if it stay on longer than the 5 minutes.
2. Wait until after the furnace stops working and then test your High Temperature Limit Switch (HTLS). I don't have a video on this yet, so let me try to explain how. If you can easy get to the back of the furnace, you should see it sitting there. Carefully disconnect the wires from it and then test it for continuity. If it has continuity while the furnace isn't working then its NOT your problem. If it doesn't have continuity then that guy is your most likely culprit. If you can more easily get to the front of the furnace (like where the sail switch is) then here is what you can do instead to test the HTLS. Look at your sail switch, there should be two wires going to it, one wire is going to lead to the top pin on the circuit board and the other is going to disappear into the furnace. Disconnect the wire the disappears into the furnace and check for continuity between it and the second pin on the circuit board (the thermostat pin). Again if you HAVE continuity while the furnace is off then the HTLS is not your problem. If you don't have continuity then the HTLS is your most likely culprit.
3. Your 3rd option is to try to find a way to get the furnace to run and then fail while you have the circuit board accessible, so you can run the tests I show in the video after it fails. It could be that your circuit board stops sending the right signals at the right time.
@@rvrepairwoman I appreciate the response. It’s definitely not getting to the set temp. I’ll run those checks on the temp switch.
my fan on atwood 8535 won't shut off
Emily this is Jeff moore I have a atwood hydro flame 8500-IV could you email a copy how to diagnose. I replaced thermostat was bad then it was trying to ignite but wouldn't.
Hello! Can we get a video on how to test ac thermostat? I'm full time living in my rv and am having ac troubles. I believe it's my thermostat but not 100%. Would like to learn how to test before I spend $270 on a new tstat.
Coming soon!
How is your RV remodeling going?
The furnace is not getting signal from thermostat that is brand new
I’m just Spitballing here, but this is what I would look at
1. Test the thermostat. I’ve had a brand new part be bad, it sucks but it happens.
2. Make SURE the thermostat is actually set to heat, and the temp is set higher than the temp in the RV. Those RV thermostats can be a pain in the butt sometimes.
2. Start tracing back the thermostat wire from the board and see if there is a break somewhere
👍👍🇨🇦✌️🇨🇦✌️🇨🇦👍
Fan doesn't come on at all.
Then the problem is most likely with your sail switch.
@rvrepairwoman It wasn't. it was actually the mother/circuit board. Thank you for your reply! We got it done! About 9 days in some single digit temperatures without it. But we came through!