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Old 01-05-2020, 08:42 AM   #1
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Ongoing Aqua hot problem(s)

Hi Folks

A while back posted about an AH heat/hot water issue I was having. The diesel side would shut down after ~45 minutes. Once I got to my destination, Austin TX, I had an annual service done and the problem disappeared. The AH worked the entire trip home to NY. Since them I winterized the coach. On the way to the mothership the problem resurfaced. The diesel side shuts down. I requested they addressed it along with the rest of my AIR list but they could not reproduce the problem. As soon as I arrived, Saturday night, I realized it was acting up again. The AH works fine on the electric side, but not the diesel. Of course I had to leave Sunday morning so I had no option to stay and have to fixed. The coach has no water in the tank due to winterizing. I know it's a closed system, but is there any connection to being winterized?

Thanks in advance. Traveling back to NY from the mothership so I won't be able to answer until I arrive ~8pm
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Old 01-05-2020, 08:58 AM   #2
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As long as the fuel filter was replaced during the annual service that can be eliminated. Fuel pump pressure falling off after 45 minutes or operation could be an issue. A faulty high temp limit switch would be suspect but you would have to jump across that to determine if that was at fault. I would eliminate the float switch as the boiler fluid expands under use and if that was faulty the diesel burner wouldn't fire to begin with. I assume the exhaust is clean with very little odor. I had a similar issue with my 450D that turned out to be the flex rubber boot at the air intake would get warm and partially collapse reducing the air volume to the point the unit would shut down after a while. During this time the exhaust was clean with no indication of air volume restriction. Other than that, I can't offer any sage advice. Good luck.
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Old 01-05-2020, 10:27 AM   #3
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Quote:
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Hi Folks

A while back posted about an AH heat/hot water issue I was having. The diesel side would shut down after ~45 minutes. Once I got to my destination, Austin TX, I had an annual service done and the problem disappeared. The AH worked the entire trip home to NY. Since them I winterized the coach. On the way to the mothership the problem resurfaced. The diesel side shuts down. I requested they addressed it along with the rest of my AIR list but they could not reproduce the problem. As soon as I arrived, Saturday night, I realized it was acting up again. The AH works fine on the electric side, but not the diesel. Of course I had to leave Sunday morning so I had no option to stay and have to fixed. The coach has no water in the tank due to winterizing. I know it's a closed system, but is there any connection to being winterized?

Thanks in advance. Traveling back to NY from the mothership so I won't be able to answer until I arrive ~8pm
This is sounding like a problem we had early on. Had a number of people look at it and found nothing. Ended up being a kinked fuel line.
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Old 01-05-2020, 10:36 AM   #4
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As a suggestion, why not call Aquahot and find out which connections in the panel to jump. When it occurs, you can jump it with a paper clip or pc of wire. If it starts and runs you know its the high low thermostat. I had a similar instance several years back and that is what worked for me.
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Old 01-05-2020, 07:40 PM   #5
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As a suggestion, why not call Aquahot and find out which connections in the panel to jump. When it occurs, you can jump it with a paper clip or pc of wire. If it starts and runs you know its the high low thermostat. I had a similar instance several years back and that is what worked for me.
Thanks all. Yes, I plan to call AH tomorrow.
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Old 01-05-2020, 07:42 PM   #6
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I should clarify, when I say it shuts off, I mean the green lights turns off and the diesel side stops making heat. In order to reactivate, I hit the diesel heat button twice, once shuts it off and the second restarts it.

Electric side works fine, but struggles to keep up when were moving in cold weather
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Old 01-05-2020, 11:10 PM   #7
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That could be the photo cell flame detector. We've had that problem also. It's dirty or weak or both. When ours started acting up it was running for a bit and then the diesel burner light would go out. I'd turn of the diesel switch and turn it on and it would run for a while longer. Fortunately Southhaven RV by Memphis had one in stock so I replaced it myself, end of issue. They are not cheap so don't get sticker shock. The diesel burn light does go out once in a while but not like it used to. When they serviced your unit they may have cleaned the photo cell which made it work for a while that would explain it working on your trip back to NY.
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Old 01-06-2020, 05:26 AM   #8
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That could be the photo cell flame detector. We've had that problem also. It's dirty or weak or both. When ours started acting up it was running for a bit and then the diesel burner light would go out. I'd turn of the diesel switch and turn it on and it would run for a while longer. Fortunately Southhaven RV by Memphis had one in stock so I replaced it myself, end of issue. They are not cheap so don't get sticker shock. The diesel burn light does go out once in a while but not like it used to. When they serviced your unit they may have cleaned the photo cell which made it work for a while that would explain it working on your trip back to NY.
Quite possible, it was filthy when the service was done, but was squeaky clean after the service
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Old 01-06-2020, 07:39 AM   #9
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My bet is on the burner control unit mounted on side of the motor.
There are some checks you can do in the Aquahot manual troubleshooting section.
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Old 01-06-2020, 07:55 AM   #10
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Had a problem with the Aqua Hot that was outside temperature related. The colder it was outside the more it would fail. Illusive problem was not fixed by 2 AH specialists. I finally got AH on the line and troubleshot for a couple of hours. Ordered the ignition coil, replaced it and have not had a problem since.
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Old 01-06-2020, 11:06 AM   #11
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My bet is on the burner control unit mounted on side of the motor.
There are some checks you can do in the Aquahot manual troubleshooting section.
We had a similar sounding intermittent situation with our Aquahot. As Rollin101 mentioned go thru all the diagnostic checks in the manual. It involves manually jumping and powering each function of the burner unit with aux 12 volts and jumper wires at the connector to the burner control box mounted on the side of the burner which you disconnect for the checks. Sounds complicated but, while time consuming, it is pretty simple checks and you can manually activate each function of the burner. I used my portable battery jump start box for power My problem turned out to be the burner control module also. Again, the problem was intermittent so by manually making all functions of the burner operate successfully I assumed it was the module and replaced it. No problems for a year with much Aquahot operation! I think the control box had been problematic for some time as some unexplained times the diesel green light would disappear then reappear mysteriously over the past years quit
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Old 01-06-2020, 11:17 AM   #12
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My bet is on the burner control unit mounted on side of the motor. .........
I agree ^^^
If the Diesel switch light comes on and then shuts off. This is an usually an error condition of the Webasto Control box. The manual has troubleshooting to try and pinpoint the cause.
Here is a link to the Webasto portion of your system.
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Old 01-06-2020, 12:10 PM   #13
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Steve:

Now THAT is some useful information!!!! Thank you for posting.

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Old 01-06-2020, 03:13 PM   #14
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Aquahot has changed to building their own burner control unit. Don’t know if they’re better, but I assume they changed for a reason.
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