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Post by seasunofthesoul on Jun 21, 2021 9:17:04 GMT -5
I had the thru-hull replaced and now the A/C pump doesn't work...neither A/C unit cause water to discharge through the side of the hull when they run and they each eventually run to the error "HPF." This usually means they are not getting water. Since the thru-hull was replaced, could i have a vapor lock? Do i need to prime the pump? If so, how? I checked the strainer and it was clean, and the new thru-hull switch works and is open. Perhaps just dumb luck that the pump failed and needs replacement?
I also made sure the A/C pump breaker is on and that the pump housing is hot to the touch after it has tried to run for some time.
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Post by gofast24 on Jun 21, 2021 10:31:14 GMT -5
Assume pump runs but no water to pump? Turn off sea cock, put water hose into tube going to AC units, push water until you see flow coming out of thru hull, shut off waters hose, put hose quickly back onto to strainer, and try again.
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Post by seasunofthesoul on Jun 21, 2021 11:52:05 GMT -5
thanks. Good idea. I'll give that a try next time I get a chance.
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Post by joefran on Jun 22, 2021 6:09:06 GMT -5
I keep mine on a lift so water drains out after being on the lift. So I have to get it up on plane or feed water through the out put on the side with a hose until I see a few bubbles come from bottom in pick up location of the boat to prime the pump.
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Post by jnelson90 on Jun 22, 2021 10:54:44 GMT -5
I believe AC raw water pumps are magnetic pumps that don't self prime.
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mdj67
Full Member
Posts: 37
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Post by mdj67 on Jun 23, 2021 7:36:28 GMT -5
I take the hose off the outlet side of the pump and start the ac - as soon as the pump kicks in and water starts to spray I quickly put hose back on and tighten clamp - just don't take hose all the way off and be ready to install. Only by-product is a little water spray. Good luck.
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Post by gofast24 on Jun 28, 2021 10:29:52 GMT -5
I believe AC raw water pumps are magnetic pumps that don't self prime. Agree |
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Post by thecrankycop on Jun 28, 2021 19:04:53 GMT -5
I JUST did this yesterday on my 26xo. I cleaned out the strainer for the AC.
Shut the silcock. Empty the strainer so there is no water in it. Hold a hose up to the port on the outside where the AC water exits. This takes a while (at least for me it did). Once the strainer is totally filled with water, open the silcock and the HPF error shouldn’t come back on. You’ll see water slowly starting to drain then it goes back to normal.
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Post by seasunofthesoul on Jul 5, 2021 12:58:35 GMT -5
Thanks! I tried something a little similar...sending water into the exit on the side of the hull but that didn't get things going for me. I'm now going to change the pump (yes, it is magnetic) in hopes that will do the trick. Of course, the new pump will need to be primed, too. I'm a bit disappointed that the info i can find everywhere about the pump just says "this is not a self priming pump " and that's it. No instructions on actually how to prime it.
When you say it took a long time to add water through the outlet...how long? On my 4460, the water lines seem fairly long so maybe i didn't run water long enough? I used the pressure nozzle on the hose hoping that would work. Maybe not?
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Post by gofast24 on Jul 7, 2021 10:24:17 GMT -5
The inlet thru hull (scupper) to this pump normally faces forward to "charge" inlet with water pressure. Try going out, 3/4 speed, then turn on HVAC system. May push coolant into system and function again?
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Post by thecrankycop on Jul 7, 2021 18:57:37 GMT -5
It took me about 15 minutes. I held the hose up to the scupper and when the AC strainer filter was totally filled with fresh water, I turned back on the system again, and the lines were fully primed
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Post by seasunofthesoul on Aug 3, 2021 13:40:32 GMT -5
To followup here...i ordered a replacement Dometic A/C pump and upon having it replaced...found out indeed the old pump's shaft to the impeller was broken (not spinning. Detached at the base). Installed the new pump, flooded it, then started and voila! Great water pressure through the side hull! 🤗
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Post by cyshepp on Aug 25, 2021 20:37:37 GMT -5
I had the thru-hull replaced and now the A/C pump doesn't work...neither A/C unit cause water to discharge through the side of the hull when they run and they each eventually run to the error "HPF." This usually means they are not getting water. Since the thru-hull was replaced, could i have a vapor lock? Do i need to prime the pump? If so, how? I checked the strainer and it was clean, and the new thru-hull switch works and is open. Perhaps just dumb luck that the pump failed and needs replacement? I also made sure the A/C pump breaker is on and that the pump housing is hot to the touch after it has tried to run for some time. I just “tried “ to prime my pump by closing the sea cock, taking off the “exit” hose from the pump. Then opening the sea cock until water came out. Put it all back together but still no water getting to AC unit. Do I have.a vapor lock? |
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Post by gofast24 on Aug 26, 2021 10:36:01 GMT -5
I believe AC raw water pumps are magnetic pumps that don't self prime. Yes, magnetically driven, no shaft or seal between motor and pump impellor. |
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Post by gofast24 on Aug 26, 2021 10:39:10 GMT -5
I had the thru-hull replaced and now the A/C pump doesn't work...neither A/C unit cause water to discharge through the side of the hull when they run and they each eventually run to the error "HPF." This usually means they are not getting water. Since the thru-hull was replaced, could i have a vapor lock? Do i need to prime the pump? If so, how? I checked the strainer and it was clean, and the new thru-hull switch works and is open. Perhaps just dumb luck that the pump failed and needs replacement? I also made sure the A/C pump breaker is on and that the pump housing is hot to the touch after it has tried to run for some time. I just “tried “ to prime my pump by closing the sea cock, taking off the “exit” hose from the pump. Then opening the sea cock until water came out. Put it all back together but still no water getting to AC unit. Do I have.a vapor lock? Yes. Try taking off outlet hose from pump and see if waters flows. Make sure you can get to sea cock to stop flow first! |
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