High pressure warning AC

Discussion in 'General Maintenance/Repair Questions' started by Dan Leff, Sep 22, 2022 at 3:39 PM.

  1. Dan Leff

    Dan Leff New Member

    Mar 5, 2021
    Carolina Beach, NC
    2000 40' Sedan Bridge
    Caterpillar 3116TA
    40ā€™ sedan bridge Forward stateroom unit keeps getting a high pressure warning. I have blown out the lines and get good water flow. I ran barnicle buster through the lines and it still is showing a hp warning. The other unit is working fine and has great water flow so the pump is working fine as it controls both units. I have reset the thermostat but still get the warning. Looking for any else I could try before calling in a pro. thanks
    GirlyGirl1999 likes this.
  2. ocgrant

    ocgrant Official Bahamas Boating Ambassador GOLD Sponsor

    Dec 31, 2006
    Miami / Ft Lauderdale
    H2O Therapy
    2006 Sundancer 48
    Novurania 430DL
    Yamaha EX-R
    PADI Divemaster
    Raymarine Electronics
    Cummins QSC 540's
    If it is truly going HP and the cooling is good do you have good air flow through the evap coil? Is the filter clean? Short of that the unit is done due to blockage
    GirlyGirl1999 likes this.
  3. GirlyGirl1999

    GirlyGirl1999 Well-Known Member GOLD Sponsor

    Apr 10, 2021
    Lake Norman NC
    1999 Sea Ray 290 DA
    Twin 4.3 with Alpha 1 Gen 2 drives
    Is the sensor not replaceable? Iā€™m spit balling here, not an A/C expert.
  4. Mark.60

    Mark.60 Well-Known Member GOLD Sponsor

    Sep 6, 2020
    Westbrook Connecticut
    2007 44 sedan bridge
    Cummins qsc 500
    The high pressure switch is replaceable and readily available at any HVAC supply house.
    If the original one is soddered into place just screw the new one on the high pressure schradder valve and connect the two wires.
    Dan Leff and GirlyGirl1999 like this.

Share This Page

Show Sidebar