Maritime Geothermal Water-to-Water Heat Pump W-100-AC-P-4S

Take a picture of the control board and connectors for reference

Remove all green terminal strips from the left side, right side, and bottom of 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 if necessary

Is there a performance degradation not explained by a refrigeration circuit problem or low loop flow rate?

Flush heat exchanger with a lime removing solution

Is the system performance reduced for warm water open loop systems?

Compressor Contactor Inspection

Is replacement or tightening 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

Check the presence of strainers

Is there any visible debris on the strainers?

Are all strainers free of debris after cleaning?