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Old 21-05-2018, 13:46   #1
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AC Issue

Despite years of little to no use, my good old 16K BTU Marine Air system started up and ran fine recently, but on a more recent start up it took an HPF error soon after start up. No problem, likely a water flow issue, so I cleaned out the water lines (not very dirty) and fired it up. Started fine, but I noticed this time that after a few minutes of operation the sea water pump stopped. Then of course predictably it HPF'ed again soon thereafter.

If I power down the unit and restart the same thing happens again (pump runs at start up and then stops), so the pump isnt dead, its just stopping for some reason, but runs again on reset.

Troubleshooting suggestions?
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Old 21-05-2018, 13:57   #2
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Re: AC Issue

Have you tried bleeding air in the intake just post the pump?
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Old 21-05-2018, 14:03   #3
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Re: AC Issue

What flavor of controls do you have?

Old rotary knobs?
Digital?

Have you measured the voltage at the pump to see if the pump is stopping or is being turned off?
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Old 21-05-2018, 17:59   #4
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Re: AC Issue

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Originally Posted by Sailmonkey View Post
What flavor of controls do you have?

Old rotary knobs?
Digital?

Have you measured the voltage at the pump to see if the pump is stopping or is being turned off?
Digital, Passport model. Like this: https://goo.gl/images/QHTHtv

Will check voltage.
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Old 21-05-2018, 18:00   #5
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Re: AC Issue

Quote:
Originally Posted by Paul L View Post
Have you tried bleeding air in the intake just post the pump?
Disconnected cooling water hose at pump discharge today and ran a snake up it. I could blow air all the way thru hose and water is flowing.
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Old 22-05-2018, 02:58   #6
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Re: AC Issue

"The HPF is a High Freon Pressure error. It indicates that airflow around the condenser isn't happening like it should. This is sometimes caused by a dirty filter, an obstruction in front of the intake, a broken fan, or even just a blown fuse that prevents the fan from running."
Per ➥ Marine Air - Error Message
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Old 22-05-2018, 03:47   #7
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Re: AC Issue

Get yourself a cheap extension cord, cut the female end off and wire it directly to the water pump, bypassing the A/C control board. The pump should obviously run without stopping. If it stops, you have a pump problem. If not, you fire up the A/C and run it while the pump is receiving bypass power. If it runs fine, you have a control board problem. BTW, keep the cut extension cord you will be surprised what else you may need it for!
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Old 22-05-2018, 04:12   #8
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Re: AC Issue

If you have a March pump they are water cooled and can overheat and shut down. There are two metal cooling tubes which the sea water passes through to cool the pump, take it apart and run some muriatic acid through, and clean any obstructions in the tubes with a small piece of wire. If you leave the system shut down for a long time with sea water in the lines it can clog with growth..
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Old 22-05-2018, 04:45   #9
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Re: AC Issue

Quote:
Originally Posted by GordMay View Post
"The HPF is a High Freon Pressure error. It indicates that airflow around the condenser isn't happening like it should. This is sometimes caused by a dirty filter, an obstruction in front of the intake, a broken fan, or even just a blown fuse that prevents the fan from running."
Per ➥ Marine Air - Error Message
Fan is running fine, air flow around unit is good. HPF also happens, and most commonly in my experience, when cooling water gets compromised.
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Old 22-05-2018, 04:47   #10
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Re: AC Issue

Quote:
Originally Posted by rourkeh View Post
If you have a March pump they are water cooled and can overheat and shut down. There are two metal cooling tubes which the sea water passes through to cool the pump, take it apart and run some muriatic acid through, and clean any obstructions in the tubes with a small piece of wire. If you leave the system shut down for a long time with sea water in the lines it can clog with growth..
I was just thinking that, pump has neen unused for a long time so those little tubes could be clogged. Another option to try.
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Old 22-05-2018, 04:48   #11
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Re: AC Issue

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Originally Posted by edmundsteele View Post
Get yourself a cheap extension cord, cut the female end off and wire it directly to the water pump, bypassing the A/C control board. The pump should obviously run without stopping. If it stops, you have a pump problem. If not, you fire up the A/C and run it while the pump is receiving bypass power. If it runs fine, you have a control board problem. BTW, keep the cut extension cord you will be surprised what else you may need it for!
Ed
Yes, a good diagnostic I think, will isolate which component has the problem.
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