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Topic: Aqua Hot Circulating Pumps (Read 1024 times) previous topic - next topic

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Aqua Hot Circulating Pumps
I just changed the ignition coil on my Aqua Hot.  It went pretty well.  The contacts on the old one were quite a bit askew from where they should have been and that may have contributed to my original misfire issues.  Put the new one on and...

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  • Last Edit: February 18, 2020, 12:18:10 pm by coastalbuilder

  • Rudy
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  • Commercial Member
Re: Water Pump and Aqua Hot Circulating Pump
Reply #1
Under the Aqua Hot cover located on the face of the tank, there is a fuse for the pumps in the series of fuses above the clear zone relays.  Check those fuses to see if one is failed.  A failed pump fuse stops all zone pumps and no heat to any...

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Re: Water Pump and Aqua Hot Circulating Pump
Reply #2
Under the Aqua Hot cover located on the face of the tank, there is a fuse for the pumps in the series of fuses above the clear zone relays.  Check those fuses to see if one is failed.  A failed...


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Re: Water Pump and Aqua Hot Circulating Pump
Reply #3
Fuses are good.  Pumps sound like they are running.  They are also hot.  Still no heat on any zone.

Re: Water Pump and Aqua Hot Circulating Pump
Reply #4
They are magnetic drive, tap on them they might be stuck.

Re: Water Pump and Aqua Hot Circulating Pump
Reply #5
They are magnetic drive, tap on them they might be stuck.
All three of them stick at the exact same time?  I can give it a try.

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Re: Water Pump and Aqua Hot Circulating Pump
Reply #6
Could the check valves at each pump be stuck?  Maybe try tapping on them to free up the flapper?

  • Rudy
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  • Commercial Member
Re: Water Pump and Aqua Hot Circulating Pump
Reply #7
With pumps running, whack each check valve.  Check for valve becoming hot.

If no heat yet, loss of prime is next suspect.

Fill coolant tank at radiator filler neck to lipping full.  Install radiator pressure tester.  Turn all pumps on and pump...

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Re: Water Pump and Aqua Hot Circulating Pump
Reply #8
Follow up? Do you have pump working now?

Re: Water Pump and Aqua Hot Circulating Pump
Reply #9
Not yet.  Ran out of time today.  Will work on it tomorrow.  Thanks!

  • DavidS
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Re: Water Pump and Aqua Hot Circulating Pump
Reply #10
Was going to add that an air bubble in the line will cause the same symptoms.. Hence pumping the system to 15psi will help move the bubble.

Re: Water Pump and Aqua Hot Circulating Pump
Reply #11
If you don't have a pressure tester, one can be borrowed at your local auto parts store.  I got one at O'Riley's. Make sure Aqua Hot is full to the top and your overflow tank is at the correct level.
John M.

Re: Water Pump and Aqua Hot Circulating Pump
Reply #12
Small town.  No radiator test kits locally but I think I can rig one with a small air pump.  Any idea where to buy the correct pink/red coolant off the shelf?

  • Rudy
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  • Commercial Member
Re: Water Pump and Aqua Hot Circulating Pump
Reply #13
Your vintage heater uses 50/50 engine antifreeze.  A gallon or two of just distilled water will do just fine.

Re: Water Pump and Aqua Hot Circulating Pump
Reply #14
That was my gut feeling as well.  You da man Rudy.

  • DavidS
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Re: Water Pump and Aqua Hot Circulating Pump
Reply #15
Instruction (I actually read instead of looked at the pics) lol

Use an air compressor and blow into the overflow line into the aquahot until the relieve valve pops and that puts pressure on the tank so you wont need the coolant pressure kit  ^.^d

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  • DavidS
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Re: Water Pump and Aqua Hot Circulating Pump
Reply #16
Update with instructions from the manual..  ^.^d

Little confusion on my instructions so I am posting the copy of the manual where everyone should look up on there own (never assume).. ^.^d

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Re: Water Pump and Aqua Hot Circulating Pump
Reply #17
Update:
Tapping on the pumps and relief valves did nothing.
I got 2 gallons of distilled water and borrowed (bought and return) a pressure test kit from Advanced.
Getting fluid into the hole is a pain.  Sounded like it was really empty thus the loss...

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  • DavidS
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Re: Water Pump and Aqua Hot Circulating Pump
Reply #18
the tempering valve is on the water side.

Re: Water Pump and Aqua Hot Circulating Pump
Reply #19
the tempering valve is on the water side.

Correct.  But I'm wondering what else was removed to get to it and how much stuff was pushed and shoved to do it.  or if anything was removed that would...

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  • DavidS
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Re: Water Pump and Aqua Hot Circulating Pump
Reply #20
Correct.  But I'm wondering what else was removed to get to it and how much stuff was pushed and shoved to do it.  or if anything was removed that would have meant losing coolant. ...


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Re: Aqua Hot Circulating Pumps
Reply #21
Update - Good news, bad news.
Good news:
Managed to get the pumps primed.  That was the heat issue in the cab.  Filled to the rim and pressurized to 15PSI.  Fired her up and we have heat.
Bad news:
I have a coolant leak.  The overflow line was so...

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Re: Aqua Hot Circulating Pumps
Reply #22
If the tubes are leaking in the burner, about 10 cb's is what I was quoted on my '96 Monaco. The tubes crack from heat if the coolant gets too low to keep them filled.

Re: Aqua Hot Circulating Pumps
Reply #23
Talked with Rudy. He gave me some optimistic things to look at and think about.  Will report back.  After it stops raining...

  • DavidS
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Re: Aqua Hot Circulating Pumps
Reply #24
Talked with Rudy. He gave me some optimistic things to look at and think about.  Will report back.  After it stops raining...
Wonder if stop leak would help?

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