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High pressure lockout when changing from heat to cool

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My 2006 RHEEM Air Conditioner is giving me a code for "High-Pressure Lockout" when I change from heat to cool. I reset it by shorting the test prongs and it runs fine until we change to heat and then back to cool again.
Any ideas why this is happening?

Comments

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,614
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    Don't know. But I am thinking a 5 or 10 min. time delay on changeover may be the fix
    mattmia2
  • HVACNUT
    HVACNUT Member Posts: 5,861
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    Does the condenser fan run in cool?