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Old 10-28-2020, 06:32 AM   #1
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Aquahot Fluid Leak

2017 Aspire 44b, AH-400

It looks like I'm leaking aquahot fluid.
We used the bus for 2 weeks in June and 3 weeks in August.
We have a guest this week, and she's staying in the "rolling guesthouse"
When I started up the Aquahot diesel burner, I got a burner fault, repeatedly. Checking lights on the control panel showed a red low level. Overflow tank was empty.

It was due, so I did a full burner service. I put a bunch of boiler fluid in before the light went out. I found the DC High Limit Sensor was tripped. (note: there seem to be two of these, they are wired in series, both of mine were tripped. Searches showed they may trip if the fluid level gets very low.)

I think I have a leak. I'll fill it to full hot, come back in 10 minutes and the expansion tank is empty. Put a pint in, repeat.
I've done a cursory check, around and behind the aquahot, under the RV, in the midbath and main bath vanity, and above the water tank where the booster pump is. I'm not seeing anything, and thinking with the volume I seem to be losing that I must have a leak.

How do I find or test for this leak?
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Old 10-28-2020, 10:06 AM   #2
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Quote:
Originally Posted by oneknight View Post
2017 Aspire 44b, AH-400

It looks like I'm leaking aquahot fluid.
We used the bus for 2 weeks in June and 3 weeks in August.
We have a guest this week, and she's staying in the "rolling guesthouse"
When I started up the Aquahot diesel burner, I got a burner fault, repeatedly. Checking lights on the control panel showed a red low level. Overflow tank was empty.

It was due, so I did a full burner service. I put a bunch of boiler fluid in before the light went out. I found the DC High Limit Sensor was tripped. (note: there seem to be two of these, they are wired in series, both of mine were tripped. Searches showed they may trip if the fluid level gets very low.)

I think I have a leak. I'll fill it to full hot, come back in 10 minutes and the expansion tank is empty. Put a pint in, repeat.
I've done a cursory check, around and behind the aquahot, under the RV, in the midbath and main bath vanity, and above the water tank where the booster pump is. I'm not seeing anything, and thinking with the volume I seem to be losing that I must have a leak.

How do I find or test for this leak?
Jim, not that this is your problem, but I have seen where the Aquahot will leak into the overhead liner of the cargo compartment and not show up because the liner holds it. If you can’t find any other leaks you might want to check for overhead liner sagging in places especially if you’re using the heat.
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Old 10-28-2020, 05:55 PM   #3
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Mine was leaking in the gap between the floor tile and basement. It turned out a staple had punctured one of the Aqua-hot lines in the floor during install. It was hard to diagnose and find? Good luck.
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Old 10-28-2020, 09:50 PM   #4
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Mine had a leak in the plastic hose from the fill jug. It was dripping on the burner and evaporated so no fluid was on the ground but I kept loosing fluid. Simple fix, changed the hose.
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Old 10-28-2020, 11:55 PM   #5
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Don't know much about servicing those units since mine is propane but is it possible that you are just working out the air in the lines after the service?
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Old 10-29-2020, 06:24 AM   #6
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Quote:
Originally Posted by TXTiger View Post
Mine had a leak in the plastic hose from the fill jug. It was dripping on the burner and evaporated so no fluid was on the ground but I kept loosing fluid. Simple fix, changed the hose.
The most common place if that hose is not changed from the factory hose. It will turn brown from heat and crack. They always seem to crack on the bottom where it can't be seen.
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Old 10-29-2020, 03:49 PM   #7
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Fingers crossed here. It's still using a little, 550ml in 2 days.
That's a lot but nuttin compared to the gallons I've put in over last week.

I probably do have a problem, the thing simply should never need multiple gallons of fluid.
Keeping an eye on this for now.

Thanks to everyone who responded.
Note to Mike: Servicing the unit does not require opening up the boiler or draining any fluid.

And yes, I replaced the overflow tank hose with some 5/8" automotive heater hose some time ago, the original clear hose didn't last a year.
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Old 10-30-2020, 10:55 AM   #8
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Reading with interest all your post on this subject. Has anyone had a "low level tank cut off" light come on? My expansion tank is empty until it reaches operating temp. Maybe air in the system on my 400P but no low level light.
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Old 10-30-2020, 02:01 PM   #9
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Originally Posted by JohnArch View Post
Reading with interest all your post on this subject. Has anyone had a "low level tank cut off" light come on? My expansion tank is empty until it reaches operating temp. Maybe air in the system on my 400P but no low level light.
Sounds like you need to add fluid. When cold bring the level up to the cold line until you can run it to full operating temperature (just after gas burner cycles off) then bring the fluid level up to the hot line on the expansion tank.
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Old 10-31-2020, 07:07 AM   #10
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Thx 757driver - that makes sense. The manual just says to add to hot fill line but doesn't mention if the unit should be at operating temp. It does say to check the level at op temp. Unless I missed something in the manual. I will add to cold fill line then turn it on and watch the level.
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