and verify if the board initiates a defrost cycle when shorting the "test" pins

ensure the valve body is de-pressurized and surfaces are cleaned of debris before reassembly to ensure a proper seal

How do I verify the rotation for this part

Operating at 208-230V

Carrier HK02ZB421 Pressure Switch 320788-702 and verify if the boardThe Carrier HK02ZB421 Pressure Switch is a critical safety component designed for R 410A refrigerant residential and commercial air conditioning systems. This heavy duty high pressure switch features a normally closed SPST (Single Pole Single Throw) configuration and is factory calibrated to open at 610 PSI to prevent compressor damage during over pressurization. Once system pressure stabilizes, the switch initiates a manual reset or automatic close