Maritime Geothermal Water-to-Water Heat Pump WH-25-H

Inspect contactor points for pitting or burning

Are the contactor points in good condition?

Replace contactor points if necessary

Is the LCD Interface or PC App accessible?

Are there any alarms or faults reported?

Describe any alarms or faults found

Rectify any problems if alarms are found

Was the problem rectified successfully?

Replace the compressor and liquid line filter-dryer

Charge the unit with new refrigerant and operate for 2 hours

Charge the unit and operate for 2-3 days

Charge the unit and operate for 2 weeks

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 standoffs

Remove the new control board from the static bag

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