Maritime Geothermal Water-to-Water Heat Pump W-90-W-P-4S

Remove the display board cable connector from the control board

Slice each of the display board standoff heads off using a sharp utility knife

Pull the display board from the unit

Remove the display board cable connector from the back of the display board

Place a new display board standoff into each of the four holes in the cabinet

Take a picture of the control board and connectors for reference

Remove all green terminal strips from the control board

Remove the red six pin display board connector from the left side of the control board

Remove all connectors from the top of the control board

Remove the control board from its four corner standoffs

Remove any remaining standoffs from the old control board

Install cut off standoffs from the old board onto the new board

Align and snap the new control board into the four corner standoffs

Compressor Contactor Inspection

Is replacement of contactor necessary?

Is tightening of wires necessary?

Pump down the unit as per the Pumpdown Procedure

Was there a compressor burn out (motor failure)?

Remove crankcase heater, leaving electrically connected

Replace the liquid line filter-dryer

Are there any alarms or faults reported on the LCD Interface?

Rectify any problems found if alarms are present.

Ensure all alarms are cleared after rectification.

Confirm that the heat pump is operating normally after rectification.