[Jeff737]

Hey all,
just purchased a 2007 4300 sovran this year and one of the A/C pumps is giving me a HPF fault almost continuously.  We have cleaned the strainers and made sure the seacock is open.  We've also tried resetting by leaving the pump off for 15 minutes, but so far no luck. We're trying to back pressure the system this week but does anyone know what else it can be other than the pump itself?
Thanks

[TIARA44]

Hi,

Check the Air Filter at the blower unit to make sure it is not dirty/plugged. When you have the basket out of the sea water strainer, do you get real good flow if you open the seacock? Sometimes you can 'suck' junk up into the intake line and it will greatly reduce the water flow. Lots of luck with your new boat!!

[jclark003]

Do you get discharge water flow when the compressor is on ? If there is no water flow and the lines and strainer are clear you may be airlocked. I had similar issues with my last 43 open. Occasionally had to crack open the top of strainer until water would flow out the top. AC pumps create only minimal suction which is why they need to be mounted below water line.

[rapnjar]

I have a 2008 Sovran...check that both a/c water pumps are moving good water...these are powered by circuit breakers yet controlled/switched by the individual air conditioners. If both pumps result in good water flow then you need to run Barnacle Buster in a closed loop through the water cooling system on both systems. By both systems I mean you circulate BB through all the water cooling systems on water pump #1 then again on water pump #2.

What happens is barnacles begin to grow in the water cooling systems by attaching themselves inside the cooling coils in the compressor section thus preventing adequate heat transfer to occur which ultimately builds up heat and pressure and you get an HPF fail. The good news is that your air conditions are probably fine...they just need the water cooling system to be cleaned.

It’s a pain to set up the first time but google up barnacle buster and on their web sight you’ll see their devices the sell so you can do this yourself...I made a setup from a 5 gal bucket, 12v bilge pump and some hoses. Once you have a closed loop, circulate BB through the system for 4-6 hours and hopefully your good.

Jeff


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