After taking the motor out of the RV and disassembling it, I discovered there was a tiny piece of debris lodged in the gas orifice. I believe that was what was causing that strange hum.
klg1001 The cover was over the exhaust port when I purchased the RV. From what I understand, these covers are common and are relatively inexpensive. There is a trick to putting them on though, and I understand if you purchase one the instructions will tell you how to properly install them. There is definitely a trick to putting them on and taking them off. If you don’t know the trick, you can ruin the springs (like I did when I put it back on after taking it off to try to fix the unit).
Product and Equipment Reviews by RES oh boy hope you found a replacement spring. Were you able to look down the tubes with a flashlight by chance? I’m no expert but have just spend several weeks learning about these furnaces. It sounds to me almost like a whistling sound that I suspect an obstruction inside the heat exchanger/ exhaust tube may be the cause of the noise. It’s not as likely if that RV has had the cover over the exhaust most of it’s life but if it’s only been on a couple of years there’s a chance birds/ mud daubers/ mice found their way into the outside ports or through the interior ducting. It’s amazing the amount of sticks, feathers, dead mice you can find in these things.
klg1001 Yes, I was able to look down that port. In fact, I ended up removing the furnace from out of my RV and disassembling it. This is a very interesting story. What I believe caused the humming noise was a tiny piece of debris that was lodged in the gas orifice. I spent months on this project, learning about these furnaces and watching many helpful TH-cam videos and also talking with Suburban, the manufacturer. I also researched where I could purchase replacement parts for the RV, and as you have probably discovered, replacement parts are ridiculously overpriced. I should make another video of my experience with this furnace because I feel it will be of benefit to others. What was wrong with yours?
Product and Equipment Reviews by RES Product and Equipment Reviews by RES I’m glad you were able to find the source of your problem. If it happens again i would check for rust in the manifold tube that supplies the burner with propane. They tend to rust out inside and it’s recommended to replace if it’s rusty. My problem was a failed blower motor. I was able to find some small DC motor brushes at a local rebuilder shop for 15$. My biggest issue came from putting it back together and testing. It would run great for a couple of minutes then the limit switch would open yet the thermostat wasn’t satisfied yet so it would continue to run the fan for ~30 seconds and relight the burner for another couple of minutes and repeat. I interpreted this as a limit switch failure but since replacing the switch I’ve realized that may actually be the normal operation of the unit.
@@klg1001 How did you determine the brushes needed replacing? If you were able to solve the problem for $15, that is a bargain. Is the unit working now after replacing the limit switch? Also, in regards to your comment above about possible rust in the manifold tube and, if found, needs replacement. Do you mean ONLY the manifold tube or the entire furnace because, once the manifold gets rusty, the only thing to do is replace the entire unit?
Mine is doing this too
After taking the motor out of the RV and disassembling it, I discovered there was a tiny piece of debris lodged in the gas orifice. I believe that was what was causing that strange hum.
That’s a nice mesh cover for the exhaust port that you have: Did you add that or did it come installed on the unit when you bought it?
klg1001 The cover was over the exhaust port when I purchased the RV. From what I understand, these covers are common and are relatively inexpensive. There is a trick to putting them on though, and I understand if you purchase one the instructions will tell you how to properly install them. There is definitely a trick to putting them on and taking them off. If you don’t know the trick, you can ruin the springs (like I did when I put it back on after taking it off to try to fix the unit).
Product and Equipment Reviews by RES oh boy hope you found a replacement spring. Were you able to look down the tubes with a flashlight by chance? I’m no expert but have just spend several weeks learning about these furnaces. It sounds to me almost like a whistling sound that I suspect an obstruction inside the heat exchanger/ exhaust tube may be the cause of the noise. It’s not as likely if that RV has had the cover over the exhaust most of it’s life but if it’s only been on a couple of years there’s a chance birds/ mud daubers/ mice found their way into the outside ports or through the interior ducting. It’s amazing the amount of sticks, feathers, dead mice you can find in these things.
klg1001 Yes, I was able to look down that port. In fact, I ended up removing the furnace from out of my RV and disassembling it. This is a very interesting story. What I believe caused the humming noise was a tiny piece of debris that was lodged in the gas orifice. I spent months on this project, learning about these furnaces and watching many helpful TH-cam videos and also talking with Suburban, the manufacturer. I also researched where I could purchase replacement parts for the RV, and as you have probably discovered, replacement parts are ridiculously overpriced. I should make another video of my experience with this furnace because I feel it will be of benefit to others. What was wrong with yours?
Product and Equipment Reviews by RES Product and Equipment Reviews by RES I’m glad you were able to find the source of your problem. If it happens again i would check for rust in the manifold tube that supplies the burner with propane. They tend to rust out inside and it’s recommended to replace if it’s rusty. My problem was a failed blower motor. I was able to find some small DC motor brushes at a local rebuilder shop for 15$. My biggest issue came from putting it back together and testing. It would run great for a couple of minutes then the limit switch would open yet the thermostat wasn’t satisfied yet so it would continue to run the fan for ~30 seconds and relight the burner for another couple of minutes and repeat. I interpreted this as a limit switch failure but since replacing the switch I’ve realized that may actually be the normal operation of the unit.
@@klg1001 How did you determine the brushes needed replacing? If you were able to solve the problem for $15, that is a bargain. Is the unit working now after replacing the limit switch?
Also, in regards to your comment above about possible rust in the manifold tube and, if found, needs replacement. Do you mean ONLY the manifold tube or the entire furnace because, once the manifold gets rusty, the only thing to do is replace the entire unit?