Cruiseair stops randomly

Discussion in 'General Maintenance/Repair Questions' started by MarlieDog, Mar 29, 2023.

  1. MarlieDog

    MarlieDog New Member

    Oct 18, 2021
    2004 SunDancer 280
    Mercury 496 HO with Bravo III Drive
    My cruiseair unit will sometimes run for a few hours and sometimes only runs for a few minutes and cuts off with the High Pressure warning. I know the High Pressure reason for cut off is often lack of water flow however water flow is normal. The fact it sometimes runs for some hours before shutting down would indicate it is receiving adequate water.

    I am thinking it could be the trigger circuit that turns on the compressor and water pump ?

    When it cuts off with the High Pressure warning I turn it back on and it will then run normally for a while before cutting off eventually.

    Any ideas what I can try ?
  2. techmitch

    techmitch Well-Known Member PLATINUM Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's
    Even though you seem to have good volume, the system could still be scaled or slimed and not dissipating heat well. If the system has never been descaled/cleaned with a recirculating solution, that would be my first step. Location IE Warm water, Sun and Salt make these kinds of maintenance items required more often.
    dtfeld likes this.
  3. brewster16

    brewster16 Well-Known Member

    Aug 9, 2009
    Long Beach Island, N.J.
    '07 44 Sundancer
    Twin Cummins QSC 8.3
    It's possible that something is in the line preventing flow (all the time). I suggest having a look at the Cruisair unit and removing the intake water line to be sure it's free and clear. You can run a flexible plastic drain cleaner down there. Go segment by segment (AC pump forward/back, Cruisair intake hose forward back) to be sure the line is completely clear. It's obviously not the usual air lock in the line if you see water output on the side of the boat.
  4. SKybolt

    SKybolt Well-Known Member SILVER Sponsor

    Nov 11, 2014
    Kent Narrows, MD
    Reel Nauti
    460 EC
    Detroit 6v92TA
    (Low profile's)
    Alison Gears
    12.5kw Genset
    Yep, Use barnacle buster with a recycling pump in a 5gal bucket and let run for a 5-6 hours. A lot of work but it will most likely fix your issues.
  5. ttmott

    ttmott PhD in OCD TECHNICAL Contributor

    Apr 3, 2012
    Space Coast Florida
    2006 52 Sedan Bridge
    Cummins QSM11
    Is the fault "HI PS" or "HP"?
  6. mdolesh

    mdolesh Active Member

    Dec 18, 2019
    Edgewater, MD
    2013 Sea Ray 370 Venture
    2016 Carolina Skiff 198 DLV
    Twin 300 Verado
    Make sure your vent/air lines arent kinked or obstructed. This happened with us and it was causing higher pressure to back up (not the technical term, sorry). The tech actually rerouted the air ducts slightly and removed a 12" section. Solved our problem.

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