Can anyone explain to me why heat pumps trip off on the high pressure switch, when there seems to be no problem.
Every spring & fall, we have several calls where heat pumps have tripped on high pressure switch.Start up unit & head pressures are good ( not even a little high ).
This seems to be occuring mostly when cool in the mornings and hot in the afternoon. In other words, when switching between heat & cool.
A lot of these are Rheems but have seen others do the same?
I hope ya'll can help, as I have been in the dark for years about this. Oh yea, have verified that switches are not tripping prematurely. Have run tests trying to duplicate problem but still cannot get the switch to trip.

Any & all help would be appreciated.