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Old 01-01-2016, 11:06 AM   #1
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Hydro Hot.....not

my hydro hot will heat water to what seems like the max temp using diesel, but if you try to shower the hot runs out and the burner wont fire up until the water is cold and then it starts its cycle again, im thinking the low temp thermostat is bad? sound right, it sure makes for an eventful shower,

Terry
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Old 01-03-2016, 04:25 PM   #2
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I have a Watts adjustable regulator set at about 60 lbs. Too much pressure or volume?
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Old 01-03-2016, 04:39 PM   #3
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Your Watts is set where I run mine. The HH is a bit slow to fire off, I run the electric at the campground, but when I want to take a shower I turn on the diesel. I then wait until the HH has run for about 4-5 minutes and I have enough hot water to scald myself. If you jump right into the shower the water will run cold before the HH has had it's 4-5 minutes. Just the way it works.


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Old 01-03-2016, 04:58 PM   #4
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Based on what you are saying, I would guess the stir pump is not operating. Here is a link discussing function of pump. Hydro-Hot Stir Pump - Log Hill Mesa

Good Luck!
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Old 01-03-2016, 06:15 PM   #5
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Sounds like the stir pump is a good place to start. The water is scalding hot at first and then it will cool and not re-heat fast enough. This is after the diesel burner has run long enough to fully heat the water and the electric is on also.

I'll get out there tomorrow and do some checking.

Thanks, Terry
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Old 01-03-2016, 07:19 PM   #6
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Visit the AquaHot website and download the manual for your specific model. They are very helpful for troubleshooting.

As well, post your model # and others with the same model may be able to provide some past troubleshooting experience.

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Old 01-04-2016, 12:19 PM   #7
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My Hydro Hot is

HHE-200 08E MODEL

HE04-330 SER

03-04 MANU

I am guessing that the fluid flowing through the stir pump should be very hot, 160*-190*, and the hoses should be very hot to the touch, as hot as a radiator hose in a car. Mine are warm to the touch, but neither of them, top or bottom, are so hot that you can't hold your hand on them. My thinking is that there is little to no flow through the pump and it is probably a good starting point.

I will check for a manual and also for a little more info.

Thanks, Terry
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Old 01-04-2016, 05:17 PM   #8
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I downloaded and printed the manual for my Hydro hot, I had already printed one, but it was for the previous model, go figure!

The correct manual lead me to some test procedures that indicate to me that the electronic control board is belly up!

The respective pump and zone lights are indicating like they should. Electric and heating status lights are lit.

I can't get the Low Temp Cutout light to go out. The way I understand it, the low temp cutout light goes off when the system calls for hot water with the heating on furnace. The system interrupts the interior heating when hot water is called for and turns off the Low Temp light and turns on the stir pump to circulate the fluid. Mine ain't doin that!!!

I checked voltage at the stir pump and found that there is voltage to ground on both the black and red leads, NO ground conductor and no difference of potential between the two. They're the same.

The manual took me back to the JP3 plug and I checked voltage between P3+ and P3- and it's the same as the red and black for the stir pump. No difference + to - but the same 12v to ground on both pins.

I went back to the stir pump and grounded the black lead and the stir pump started stirrin'. The stir pump works, don't know if it's pushing enough fluid, but the hoses did get hot after it ran for a little bit.

Thoughts??!!

At the moment I'm trying to get on the Berke Hydro Hot forums, I seem to be lost, to verify that I'm correctly interpreting my findings.

Terry
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Old 01-05-2016, 05:36 AM   #9
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Does the Pump #3 indicator illuminate red, green or no light? If red need to verify the continuity of your front inside diesel burner switch and wires. It also must be on for stir pump to operate. You are correct is saying the low temperature cut-off light should also not be on. Just need to eliminate the front diesel burner switch as a possible problem.

If you have eliminated the front burner switch the manual also refers you to section 6: Electronic Controller for proper pin configuration. It is possible for this problem to be the pin configuration.



If you remove the cover plate off your controller, there is is a re-set switch. Have you tried that?


Double check all things and consult with others before getting a new/used one. Suspect controller boards are not inexpensive.

Good Luck and let us know what you find.
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Old 01-05-2016, 10:29 AM   #10
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I have finally gotten on the Hydro Hot forum and I have my questions posted. I will keep this thread updated with the final outcome and how we arrive at diagnosing the problem. I am $ure it will be a $imple fix$$$

It's finally raining here in So Cal so I won't be doing any trouble shooting today. Not a huge deal, I'd much rather have the rain, we are parched!!!
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Old 01-08-2016, 05:15 PM   #11
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Well, the Hydro Hot appears to be working as it should. I won't say fixed until I've used it a time or two.

The PO had bypassed the Low Temp Cutoff T-Stat. The 2 black leads to the LTC were dangling in the clear and the yellow leads from the JP3 plug were tied together through a fuse. Once I got the wiring correct all things worked like they should.

I expected to find a reason for by passing the LTC, bad board, bad t-stat or ??, no dice, things seem in order.

Scratched that off my list of fun things to do and added the kitchen sink. You know what they say about idle hands!!

Terry
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