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Old 12-24-2017, 02:55 PM   #1
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Aqua Hot Diesel burner fails to re-ignite

I am new to this forum. I have a 2008 Beaver Contessa that has an aqua Hot system model AHE-450-DE1. With the diesel Burner switch on, the burner ignites and runs for anywhere between 6 minutes and maybe 2 hours. At some point the burner shuts off and the diesel burner light on the panel goes off, and the burner will not re-ignite until I cycle the diesel burner switch off and then back on. With the electric Heater switch on, and the diesel burner switch off, the aqua hot cycles through its functions like it is supposed to, but does not produce the level of heat and recovery that the diesel burner does.

Has anyone encountered this type of malfunction and found a solution?

Thx
Bvr Contessa
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Old 12-24-2017, 03:12 PM   #2
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Sounds like a bad connection in the switch circuit to the diesel burner. Taking the connection off and putting them back non agsin has solved several issues on our viach. Just a bit of corrosion builds up.
Worth a shot!
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Old 12-24-2017, 03:36 PM   #3
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

Can't help with your question but wanted to say hello! Keep her between the ditches!

Good luck, happy trails, and God bless!


Merry Christmas!
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Old 12-24-2017, 04:06 PM   #4
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Things that come to mind are aqua hot fuel filter and nozzle. If they haven't been replaced within the last year or two, I would suspect them. I replace mine every 18 months, but I use mine a lot as we full time..
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Old 12-24-2017, 05:02 PM   #5
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running for 6 minutes sounds OK. Two hours sounds excessive. Go through the troubleshooting in the service manual and subscribe to

Aqua-Hot Questions

Do you had any error indications on the control panel?
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Old 12-24-2017, 05:05 PM   #6
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Quote:
Originally Posted by kewag View Post
Things that come to mind are aqua hot fuel filter and nozzle. If they haven't been replaced within the last year or two, I would suspect them. I replace mine every 18 months, but I use mine a lot as we full time..
And I also suggest this as an issue. The next time it may happen, locate the AH master panel usually located within 36 inches of the AH. Usually in the same compartment. Ther you shold see a panel with some LEDs on them that may indicate the error code the system may be experiencing. Your AH service manual should have a listing of the fault codes.
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Old 12-24-2017, 05:10 PM   #7
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Quote:
Originally Posted by bvr contessa View Post
I am new to this forum. I have a 2008 Beaver Contessa that has an aqua Hot system model AHE-450-DE1. With the diesel Burner switch on, the burner ignites and runs for anywhere between 6 minutes and maybe 2 hours. At some point the burner shuts off and the diesel burner light on the panel goes off, and the burner will not re-ignite until I cycle the diesel burner switch off and then back on. With the electric Heater switch on, and the diesel burner switch off, the aqua hot cycles through its functions like it is supposed to, but does not produce the level of heat and recovery that the diesel burner does.

Has anyone encountered this type of malfunction and found a solution?

Thx
Bvr Contessa


The diesel light going off with switch on is usually a fault indication of the Webasto burner controller. Which may or may not also show up on the aquahot panel
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Old 12-24-2017, 05:41 PM   #8
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Join this forum and search around. There is a wealth of knowledge there. Just had Roger rebuild my Webasto.
http://forum.rvhydronicheaterrepair.com/forum.php
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Old 12-26-2017, 10:26 AM   #9
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Slightly misleading on the 2 hour run. During the 2 hours the burner cycles on and off correctly. At some point it fails to re-ignite the burner and the diesel light is off. The electric portion of AH runs fine.
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Old 12-26-2017, 10:52 AM   #10
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Yep, check the control panel for errors. The burner or spark gap may just need adjustment.
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Old 12-26-2017, 11:38 AM   #11
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First and foremost, go to the Roger Burke's forum for help

I have the AHE-400D, pretty much same as yours and I had the same

similar problem. If you are handy, you may be able to troubleshoot

yourself.

If you have the service manual (you can download) it on the Aqua Hot web

site. On page 23 it talks about the DC high level thermostat. It can be reset

manually. If the temperature in the tank gets above a preset temperature

(don't have the manual in font of me) it will trip and the burner will not

ignite on the next cycle. The green light inside you coach panel will go out.

You can turn off and on but if the DC high thermostat trips it will not be

able to start. There are several reasons that can cause it to trip, here is

what caused mine.

1. Expansion tank should be installed higher than the tank (I had to move

mine tank up about 8")

2. Low fluid level in the Aqua Hot tank? (did you check the level)

3. Air in the expansion tank line going to the tank. The tank can get air

bound, so you can bleed the air out of the line with the Schrader value

that is on top of the tank.

All three of those things that I have described above caused my problems.

Also check the control thermostat as well.

hope this helps.
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Old 12-26-2017, 11:52 AM   #12
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One other thing to consider - I've had a similar problem where I had a bad ground. Bad ground is often not obvious be easy to prove and fix. You need to add a jumper from the main ground on the board to the frame of the coach.

I did last winter and it proved the problem, then I had to wire in a permanent new ground.

BTW, on my coach the ground wire left the board and went back inside the coach and I could never find the other end to see what was going on, so a new ground was the easy route.
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Old 12-26-2017, 05:57 PM   #13
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Quote:
Originally Posted by bvr contessa View Post
Slightly misleading on the 2 hour run. During the 2 hours the burner cycles on and off correctly. At some point it fails to re-ignite the burner and the diesel light is off. The electric portion of AH runs fine.


That sounds like a problem at the burner. The diesel light going off is a fault indicator coming from the burner controller.
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Old 12-26-2017, 07:36 PM   #14
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Quote:
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That sounds like a problem at the burner. The diesel light going off is a fault indicator coming from the burner controller.
Can also be a fault at the control board. OP has asked for help from Roger Berke on his forum, who pointed this out as well.
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