Arrived at location on 6/28/22 - Wants preventative maintenance every year. Found timer is not getting power from the pressure switch micro switch. I will obtain a new pressure switch assy and return. Returned to location on 7/1/22 - Installation of pressure switch. Dismantle top panel. Dismantle old pressure switch. Install new pressure switch and test. Adjust pressure switch. Unit needs 15-20 psi at 120F. Test unit and observed. Unit operational.