When I winterized my boat this winter I accidentally let a air gap into the line, afterwards the AC pump now continues to run weather the heat/AC are running or not. Both Heat and AC both still work normally other than the water pump starts running when the AC breaker is turned on and continues to run until the switch is turned off. I'm guessing a stuck relay, so I took the cover off the relay board and lightly taps each relay hoping to release them if that was the problem ( didn't work) I have also tried to disconnect all power ( 12volt and 110volt ) for a while hoping for a reset (nothing) . Any suggestions would be appreciated and I have a electronics back ground and don't mind installing a external relay if need be.

Thank you