Why is your gauge on low side going into retard when trying to add freon into goodman heatpump?

If the low-side gauge is going into the red (retard) when trying to add refrigerant to a Goodman heat pump, it could indicate an overcharged system or a blockage in the refrigerant line. Additionally, if the system is not running or is experiencing issues like a malfunctioning compressor, it can also cause abnormal pressure readings. It's essential to ensure the heat pump is operating properly and to check for any restrictions before adding refrigerant. Always follow proper procedures and safety guidelines when working with refrigerants.