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Topic: Aqua-Hot Repair (Read 504 times) previous topic - next topic

Aqua-Hot Repair

So I'm having problems with the zone 2 circulation pump; it will operate intermittently, and I want to have it replaced before the winter sets in here in Missouri.  The blower motor is noisy, so I thought I would have it replaced also.  Working with an authorized AH service place.  AH's price from AH for the March Pump 809-BR 12 volt is quoted $1500 and change.  Found numerous ones on line for much lower prices, even on Amazon.  Their price was higher than the one I found for $288.00. new, exact same pump.  Go figure.
Mike
Mike Brady
'97 U320 SE. #5137
'13 Honda Fit
Willow Springs, MO

Re: Aqua-Hot Repair

Reply #1 –
Check with Rudy on these circulating pumps and Heat Exchangers.
Roger Engdahl and Susan Green
2001 U320 3610 #5879 (Home2) - 2014 Jeep Cherokee or 2018 F150
Hastings, MN

Re: Aqua-Hot Repair

Reply #2 –
Make sure that the clear cube relays are seated properly, I think that's what controls the pumps.  It would be much cheaper to replace those first if you think that could be your problem.
Forest & Cindy Olivier
1987 log cabin
2011 Roadtrek C210P
no longer 1999 36' U320 build #5522
2013 Rzr 570 & 2018 Ranger XP1000
2006 Lexus GX470
2011 Tahoe LT 4x4
Previous 1998 45' 2 slide Newell, 1993 39' Newell

Re: Aqua-Hot Repair

Reply #3 –
Mike,  Most blower motor, burner motor noise is from the plastic clutches connecting the motor to the blower shaft which also drives the fuel pump.  Remove the black plastic cover from the burner and check the clutches.  If cracked or broken stud, replace.  And the clutches slide onto the shafts.  With motor reattached, push the clutches one way or the other to push them together.

The number two pump is turned on by the middle clear relay.  Remove the relay and replace it with either of the other two relays.  If problem goes away, get a new relay.

As you have found, replacement pumps are available online, just a lot of work to replace.

All the best
Rudy Legett
2003 U320 4010 ISM 450 hp
2001 U320 4220 ISM 450 hp
1995 U320 M11 400 hp
1990 Granvilla 300 hp 3208T
Aqua Hot Service Houston and Southeast Texas

Re: Aqua-Hot Repair

Reply #4 –
Quote from: folivier –
Make sure that the clear cube relays are seated properly, I think that's what controls the pumps.  It would be much cheaper to replace those first if you think that could be your problem.
Good suggestion, had that happen to me. If one of those pops up pump no pumpy. The little metal wires that secure them in place are easily bumped off.
1987 Grand Villa ORED
2001 U320 4010

Not all that wander are lost... but I often am.

Re: Aqua-Hot Repair

Reply #5 –
Been down this road before.  It's the pump.  When it is not delivering fluid to the exchangers (blowing cold air), I can 'tweak' the pump and it starts operating again.
Mike
Mike Brady
'97 U320 SE. #5137
'13 Honda Fit
Willow Springs, MO

Re: Aqua-Hot Repair

Reply #6 –
Quote from: Yetch –
Been down this road before.  It's the pump.  When it is not delivering fluid to the exchangers (blowing cold air), I can 'tweak' the pump and it starts operating again.
Mike
Rudy has all the parts you need at a reasonable price with all the phone tech service you need included
The selected media item is not currently available.Keith & Jo
2003 U320T 4025 PBBS Designer series
Build 6203    Cummins 500hp
2000 U320 4010 WTFE / Build 5762 —Sold—
Motorcade #18070   
Pasadena, Texas
2015 Jeep Wrangler Sahara-Sunset Orange pearl coat
Don't argue with a fool, people watching might not be able to tell the difference.

Re: Aqua-Hot Repair

Reply #7 –
Quote from: Elliott –
Good suggestion, had that happen to me. If one of those pops up pump no pumpy. The little metal wires that secure them in place are easily bumped off.

If you have room. Try putting a Zip tie around the cubes to hold them in place.
Alan Fink
Waupun, WI
2000 Blue Bird Wanderlodge  LX40
2018 F150 4x4
2020 Jeep Wrangler Unlimited  Rubicon JL