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Topic: Aqua hot not shutting down (Read 1234 times) previous topic - next topic

Aqua hot not shutting down

Fired up the unit on diesel yesterday for its monthly exercise and all went well until the cool down cycle. After the period of cool down, when it should shut off, it would spool back up, then back down and repeat till I shut it off.
  We have a granddaughter staying in the coach until her COVID-19 test results  come back so as long as we don't dip into the low 40s we can use the electric for heating. Hoping it's not the dreaded "box"

Re: Aqua hot not shutting down

Reply #1 –
It was the box on mine when that happened.

Re: Aqua hot not shutting down

Reply #2 –
I was having the same symptoms (in addition to others) New Box was the remedy.

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Reply #3 –
Is your box silver or black?if it's black better get your wallet out....  time to call Rudy



Keith

Re: Aqua hot not shutting down

Reply #4 –
Quote from: hdff –
Is your box silver or black?if it's black better get your wallet out....  time to call Rudy
Keith
I made the switch from the old silver box to the newest black box. $965(ish) to my door from our favorite AH guru Rudy if I recall.


My rebuilt silver box only went for 18 months till it failed.

Re: Aqua hot not shutting down

Reply #5 –
I have the silver box that has lasted as long as we've owned the coach.8 plus years. Guess I've got to bite the bullet😩
  Thanks for the replies .

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Reply #6 –
Update! A call to Rudy confirmed the control box is bad.new one on the way tomorrow.

Re: Aqua hot not shutting down

Reply #7 –
Thanks for the kind remarks about my service.  And the business too.  Merry Christmas all

Re: Aqua hot not shutting down

Reply #8 –
Quote from: rbark –
I have the silver box that has lasted as long as we've owned the coach.8 plus years. Guess I've got to bite the bullet😩
  Thanks for the replies .
And bullet's aren't very tasty either.

Re: Aqua hot not shutting down

Reply #10 –
While in Yellowstone, Rudy diagnosed our issue with AH and we ordered the new digital black box!  Worked like a dream and our AH is purring once again!  Pricey yes, but drama reduced to zero, awesome!

Re: Aqua hot not shutting down

Reply #11 –
I had the same problem AH. I have the silver box controller and removed the aluminum cover and replaced the 3 or 4 electrolytic capacitors. That fixed the problem. It now shuts down after cool down.

Re: Aqua hot not shutting down

Reply #12 –
Quote from: juicesqueezer –
While in Yellowstone, Rudy diagnosed our issue with AH and we ordered the new digital black box!  Worked like a dream and our AH is purring once again!  Pricey yes, but drama reduced to zero, awesome!
If I recall right the new digital box from AH is silver like the old ones, just the plugs are on wires not mounted in the box...


Keith

Re: Aqua hot not shutting down

Reply #13 –
Quote from: 2002u32042 –
I had the same problem AH. I have the silver box controller and removed the aluminum cover and replaced the 3 or 4 electrolytic capacitors. That fixed the problem. It now shuts down after cool down.
Great information. Electrolytic capacitors do have a service life
Scott
Quote
Design lifetime at rated temperature
Manufacturers of electrolytic capacitors specify the design lifetime at the maximum rated ambient temperature, usually 105°C. This design lifetime can vary from as little as 1,000 hours to 10,000 hours or more. The longer the design lifetime, the longer the component will last in a given application and ambient temperature.

Manufacturers provide calculations to determine lifetime in application. These are based on the Arrhenius equation for temperature dependence of reaction rates. This determines that the reaction rate doubles for every 10°C rise in temperature. That means that the lifetime doubles for each 10°C reduction in temperature, so a capacitor rated at 5,000 hours at 105°C would have a service life of 10,000 hours at 95°C and 20,000 hours at 85°C.
Source; Electrolytic capacitors determine the lifetime of a power supply | XP Power

Re: Aqua hot not shutting down

Reply #14 –
Quote from: hdff –
If I recall right the new digital box from AH is silver like the old ones, just the plugs are on wires not mounted in the box...


Keith
Keith, It's a black black box with the plugs on the wires. There was a spring steel clip for mounting. Of course I can't recall if my older AH unit (1998) needed this or not to mount the new box.

Re: Aqua hot not shutting down

Reply #15 –
Update,
 Received the new box before Christmas😁. Went to install new box and see that it's not "plug n play".
 The new box has 3 pig tails coming out the bottom that don't matchup with the plugs from the old unit😡.
 I will call Rudy and see what's up.

Re: Aqua hot not shutting down

Reply #16 –
The plugs match the plugs in the bottom of silver and black control units perfectly.  The male A, B and C plugs are on pigtails instead of in bottom of box.  Much less stress on bottom of board.

Plug your male B and C plugs into new control unit.  Do so with interior burner switch turned OFF.  Once installed, turn interior burner switch ON.  You are back in operation.

Re: Aqua hot not shutting down

Reply #17 –
My bad Rudy, too much Christmas Joy yesterday I guess🤣🤣

Re: Aqua hot not shutting down

Reply #18 –
Quote from: rbark –
My bad Rudy, too much Christmas Joy yesterday I guess🤣🤣
Don't feel like the lone ranger Richard. When I climbed in the bay to hook up the new box. I sat there scratching my head for a bit looking at those connectors until a couple of the few remaining neurons left in my brain finally made the connection. Then it was time to mount the thing. More head scratching.

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Reply #19 –
Haha! I hear ya.