Troubleshooting Dometic water heaters (with and without a multimeter) 

This video saved my butt. After getting caught in the rain all my family wanted was a hot shower but of course the hot water heater was not working. I used this video to find the issue, a bad thermo limit fuse, and get the hot water flowing. Luckily I had a fuse on hand but I would have been scratching my head the whole time. This was the first time I had to do a repair on our coach and am glad for this resource.

Man! this is the BEST explanation of this diagnostic process I've found on here! Thanks a ton for this! 👍👍

Great video! I was about to begin performing the diagnosis where you said switch inside. I looked and it was off 😂 again create video I'm a believer and a subscriber

Thank you so much! I'm a travel nurse and my husband and I full time RV. We are on our way to my next assignment and got to our overnight only to find that our hot water heater wasn't working. We looked at TONS of videos. Didn't find your video until the next day, and we were able to locate the problem exactly. It was the ECO plug thing!! We were praying not to hear the beep when tested it!! Easy fix for $20 (plus we had to buy a multi meter, but we'll use it plenty I think). Thank you again from the bottom of our hearts for making full time RV living a little less stressful today!

Best information I have found out there. Thanks for your help

The best video I’ve ever seen. A lot of people ramble on an on an on to the point that it’s not worth watching. You my friend are straight to the point with easy to understand instructions. Thank you 😊

Like others have said on here this is a great troubleshooting video! Thank you for putting this out there!! Helped me diagnose my water heater issue!

Excellent diagnostic video for the Dometic WH6-GEA water heater!

Thanks for your help we went from a completely working water heater to nothing at the next stop...tried your fuse trick and it worked was going to order the new tco but upon a good re-connection it all worked again! Thanks for the great video!!

I just want to say. THANK YOU!!!! This was by far the easiest explained video. I now follow you. You saved me hundreds of dollars. I even learned how to use the meter. Ty. I really appreciate it.

Great video, good info delivered in an easy to digest way. Thank you for putting this together and posting it.😊

Awesome troubleshooting video. You saved me a trip to the repair shop and a lot of trouble. The last time I brought my Rv to the shop they kept it 3 months!!!

You Sir..are a natural born teacher! Great video, great explanations! Thanks a lot.

I found your video Saturday July 18th 2023. I had been searching for videos and troubleshooting for a whole week prior to stumbling across your channel. Thanks to your video, I found the issue and ordered a thermal fuse on Saturday the 18th. I have a meter but it wasn't working. The battery is dead. Your tip with a fuse was amazing! I ordered 6 just in case since that is a recurring issues with the new dometic hot water heater. I'm about to subscribe to your channel.

This video was great, saved me spending $350 on a control board while traveling on the road. It was just the thermal fuse. Thank you!

Thank you for the video on this hot water heater. My RV was 2 months old and on its 3rd trip when the roll fuse went out. Your Video made trouble shooting it easy.

Great video Sir. The self diagnostic tips you provided helped me resolve my issue with my water heater. 🙏

Thank you so much! Of all the videos i watched on RU-vid to try to figure out what was wrong this was the most helpful. Got my water heater back up and running amd also now I have all the knowledge to conquer any other issues it gives me thanks again!

Great video for newbie like me. I request a video explaining the AC side and diagnosing the heater element function

Wow! This is super helpful. Really appreciate you taking the time to post this! Very well done. Fixed my issue. That darned thermal cutoff fuse was my issue.

Thanks for the info. Was a big help. Tested thermal fuse and had no continuity. Made a temporary jumper and the heater fired right up.. definitely buying extra thermal fuses to keep on hand.. Again thanks.

Very informative, well thought out, easy to follow. Thanks

Thank You, Excellent Video. Great job of explaining all the equipment, how it works and how to test. I have been looking for quite some time for this type of video for testing. Thanks Again, Great Job

The first thing I checked was the thermal limit fuse. Problem solved. Thanks for your video

Want to thank you.. my dometic didn’t turn on last night at a camp site, watched your video and I’ve learned over the last 3yrs of owning an RV to carry some basic tools specially a Volt-ohm meter. I followed your video, and found the fusable link to be the problem. Now of course I never had any extras. Didn’t know I should. Now I know. However after checking continuity on the fusable link, I found it intermittent. I noticed that it has some tarnish on it so I took a small knife scraped off the tarnish till the copper was shiny, cleaned off, tested it again and low and behold full continuity. Plugged it back in and the water heater worked. Now I ordered not only a few of those links but also a few thermostats, a fusable links. About $120 thru Amazon. And there were cheaper boards. It I ordered the one that Dometic uses which is pricier, but like to keep manufacturer parts. Cannot thank you enough for your video. For the crybabies that complain about camping world service centers and RV, I posted this on their FB page. I tell people if your gonna own an RV you must be capable of using basic tools and a little of patience with a RU-vid video. Tks again.

Dude thank you!! Definitely appreciate your knowledge and sharing with us!

Wow great job. Found the thermo fuse was bad. Bypassed it long enough to get our shower, then turned it all off.

Great video! I thought the control board on my brand new RV was faulty, but it turns out it was the thermal cut off fuse. It was working fine and shows no sign of blowing but tested no continuity on my multimeter. I bypassed it to just see if it lights and it does! Cheaper fix than taking it to dealer for warranty work.

Thanks! This fixed it for me. Saved me $300

Great video! Super helpful!

Thank you! Just dewinterizing and found the hot water heater not working. I initially jumped the thermo fuse and it worked. After watching this video I went back and tested the fuse and found it was just a corroded connector

Awesome video, have a electric WH issue , have good points here to begin with

Awesome stuff and thank you👍

Awesome video thank you! I don't have gas or electric coming in. All fuses are good.

This was a very well done video on diagnosis, explanation and resolution. Thanks for sharing your knowledge!

Thank you for the video, I was able to fix my water heater

Awesome video

Awesome saved me time and money. I’m going to be a sub now! Thanks man

Nice job

Thank you SO MUCH

Great video. I can’t figure out why My burner won’t ignite unless I have both electric and gas turned on.

Love the information you’ve provided! I do have a question about what’s happening with mine because it’s workings however it sounds like it’s going to explode when it starts to try to work. Help I don’t want to blow up and I’m so confused because it’s working?…

Good info

WEll done. Thank you

good video thanks

This video is great! Very informative. I’ll be getting a multimeter tomorrow to start testing. Our heater turns on but cuts back off after a few hours to days. I’m wondering if maybe the thermostat is broken and it’s overheating? Or the heating element? Any extra advice is much appreciated!

Great Great Great Video. Unfortunately, my gas side of the water heater is not working. I currently have the electric turned on to see if that is working. I am hooked to shore power at the house (20amp service). The flame when only on gas, did appear just like it is suppose to, but then shut off. Tried turning it back on, but figured the water was hot enough so it would not come back on. 24 hours later, turned on the gas side (button) again....fired up, then went out after a while. Ran through all of the knowledge you shared and got readings on everything. I then decided to drain the entire system. Following step by step what you did, I figured I could achieve flame. But nothing. I recharged the water system and am right now allowing the electric side only to see if that will heat the water. As far as the gas side of things, I am thinking that it may be those T'stat and eco connections that may be stuck in a position that wont allow the ignitor to spark / heat up. Just like a thermostat in a car if you will. If I may ask a very important question. My tank is the WH-6EA DOMETIC - can you provide the part numbers for such things as the ignitor, the control box where all the wires are connected as well as the T'STAT and ECO connections. Thanks Tony

Great video...this is the best one out there. How long does it take on gas or electric setting to warm up the water? Also, can you run them at the same time? Thank you in advance

Thanks!

If the thermal fuse has gone bad does that stop the electric side from functioning also? Another YT video claims this is the case and my WH is not functioning on either source without continuity through the fuse. Great video, thanks for the education!

Nice diagnostic tips. I have that model of water heater, but my rv just has the AC cord for the electric heat mode hanging loose not plugged in. The Dometic install instructions are confusing to me about connecting the AC cord. Any suggestions for connecting the AC?

What would you recommend checking if the gas won’t shut off? Replaced my thermostats but that didn’t fix it?

Excellent video. I checked the connector for power like you said and there was no power coming in. The "GAS WATER HEATER" switch is on and lit up so I'm not sure what to check for next. I looked at all the fuses and could not find one dedicated to the hot water heater. Any help would be greatly appreciated!

I have the exact water heater propane part of it works. Electric parts shows fault does not heat I checked all fuses there good .I checked white cable it has 12v the yellow doesn't.does that mean the board is no good? Help please

very good video on mine I have a black box that plugged into 110 and the light is lit steady red my unit works on electric but not lp I tried everything that you did except I do not know what the black box does wiring is coming out of hot water heater any ideas

Question: the thermo limit fuse is not a resettable device is it? If there is continuity thru it, it's good and if not it's no good. Is that correct?

Very informative. I have subscribed, and shared with my husband. Would you add amazon links to the things you mentioned, especially the multimeater, and the things you said it would be good to have "along in the coach". We are new to the RV world, so your link would help us make sure we didn't get confused or get the wrong items. Thanks.

I have looker for replacement parts, the prices are all over the charts, is there a manufacturer you would recommend or stay away from???? I look forward to viewing your other videos to find out what i don't know !!!!

Nice video, thanks for that. My problem is that my heater is not stopping on t-Stat and eventually blow the fuse. My rv dealer looked at it and said they replaced the thermostats and it worked. But arrived at home it still not stopping. Water is really hot to the tap and it's been 20+ minutes without stopping. I'm confused..

If your thermal cut off fuse keeps tripping does that mean the flame is rolling out and tripping it? How do you fix that? Maybe the burner tube needs cleaning? Is there a way to control the flame

So if I didn’t read any voltage on the first wire you tested. What does that mean? I read continuity everywhere else.

So I have a dometic and it’s ticking but I checked propane and it’s good. Any ideas? I heard something about it could be clogged or something ?

Great video. I have replaced the control board twice, the thermo fuse twice and the 60/82 thermostats twice. The unit will not light. I have replaced the gas valve and also the igniter with no positive result. The electric side does not work either. When I turn the unit on using both the gas and electric switches, there is a high pitch sound. Don't know where to go next.The switches both have power lights lit when turned on. I have power at both the orange and white wires. There is continuity in the igniter wire. Any suggestions?

Thank you! Excellent info. Mine is having intermittent issues where the heater works on gas but only if the exterior cover is open. When I have it open to troubleshoot, it works fine. When I close the lid, it shuts off after 10 seconds. If I switch the heater on with the cover closed, the unit will spark, light, and burn for 5-10 seconds and then turn off. I am assuming it is one of the safety features beginning to go bad so I will try new thermostats and see. Additionally this water heater makes scalding hot water. So hot the pressure relief valve leaks water when at temp. Dometic says there is nothing they can do about that. Do I have any options to get the temp to be less hot?

And then I realize I forgot to turn on the propane tanks 😂

The electric side of my gas/electric Dometic hot water heater isn't working. To troubleshoot, I went through and checked all of the things you suggested...thermal fuse, ETO, Thermometer, etc. The only thing that I could find was that there was no voltage coming from the yellow wire in the control board (around 12:11 on your video). If I'm getting no voltage from there, what does that mean? Do I need to replace the control board?

Thanks so much for a great video!! I like others here have insufficient voltage (8-ish volts) on the yellow wire, that problem isn't addressed. What next? Replace the board? Replace the element? My Dometic WH-6GEA is now only working on propane. Any assistance would be greatly appreciated.

Thank you! I understand so much better now.

What would cause the gas to ignite, when I turn on the electric?

I replaced my fuse link to the tsat .. it started then stopped then started again then stopped it blew the fuse link . I went thru the two pack …. It was making a ticking sound like the igniter was still trying light even though it had started … any ideas

What should the voltage to the yellow wire be?

So .. question I have hot water in my trailer but my furnace is still on for a long time

This is a 6g on demand right? Mine works great.... initially. but doesn't seem like an on demand. It runs cold after more than just a few minutes.

***OUTSTANDING*** video bro! Mine doesn't work on either gas or electric. Haven't opened it up yet but I assume since neither one is working it's most likely one of the common elements: fuse, ECO, or thermostat. I keep spare control boards for both the furnace and water heater but I'm hoping not to have to spend a hundred bucks to get another spare. Thanks man! Edit: It's the thermal fuse. Ordered some spares as well as the eco/therm set.

Electric theows a fault light and on gas it qill not shut down at temp?

What happens if my electric heating element isn’t turning off once the water is hot?

Just to make sure this is only for troubleshooting water heater not working on propane not electric hookup?

Electric and propane neither one works but we have a new control board and new relay. Tested the orange and white wires and I have only .5volts coming out. Help me please.

So if no power to the yellow wire then a bad control board?

When I’m plugged into city water and the water heater is off there is no leaking water. But when I have it on and it isn’t being continuously used while heated it will start leaking from somewhere in the back. It does have that weird female plastic plug. I did notice it started to leak there first and after I changed the plug is when the back started to leak. It isn’t blowing water out of the pressure relief valve either and the water does seem to be abnormally hot. Could this be a sign the thermostat is bad and causing a leak in the back of the unit because of the heat? I appreciate your feedback back because I’m completely lost as to what to do at this point

Mine lights, burns for a few seconds then goes out. Does this 3 times then fault light on panel. Any ideas?

Is there any chance you would give us a parts list or best method to figure out exact parts?

You got me running on Memorial Day 2023 .. Get explanation and knowledge..

Help! I am new to ohm meters. Trying to get a quick advise or starting point. Just got home from camping. Brand new camper with a domestic water heater. Had hot water now I don’t. electric or gas don’t heat water. Where should I start looking.

Should the thermal control switches be Normally Open(NO) or Normally Closed(NC)? And this is for both the water heater and the furnace.

why would one red wire from ECO to gas valve be burnt?

But what if you have now power to the unit? Mine won’t even try to light.

Ok dude. So, I went to dump station.. forgot to turn off the electric water heater switch and drained all the water. Now I don't have hot water. Is it the element? Yes, same water heater. You tagged and I watched. That is all I did. Frigging let the water heater operate dry.

If gas is working and electric is not, would that mean tstat and eco are in fact good?

What about if my water heater ignites and runs initially, but will not re-light when the water temperature dips. This is only when running on gas

Brand new Dometic 6GAE. I have electric side working. Propane side down. Have voltage in and out of board. ECO and tstat checked out but replaced with spares. Thermal fuse checked out but replaced with spare. Igniter checked out but replaced with spare. Swapped out my board with the spare. Still not staying lit. I ordered a new gas valve and swapped it out. No luck. There is nothing left that I am aware of. It just wont stay lit. I am going crazy.. Any additional help would be appreciated.

the gas side lights, but not the electric. breaker is on, as well as the switch. water does not heat on the electric side.

Everything is good working order up to the flow of gas with water heater!

13:49 I can't remove the thermal cutoff fuse. How hard do I need to pull?

What model clamp meter is he using?

I have this water heater. The gas side works fine. The electric does not. The 2amp fuse is not blown. I see nothing tripped on the inside fuse box. I surely don't want to go back to the dealer for this.

What does ECO stand for??

I have no power going to the first wires

My thermal fuse won’t come out

Atwood water heater indicator light will not work