I’m installing a gfci outlet inline with the power that goes to my well pressure switch. The GFCI will be to power the heat tape on the well supply line. The power is a 20 amp breaker. I installed a 15 amp GFCI jumping from the power line to the line plates on the GFCI. I did this to separate the GFCI from continuous power to the pressure switch. The GFCI outlet powers up but when the pressure switch calls for power the GFCI trips. What am I doing wrong?