I have an aquacal heat pump 120AHDEWNB
S/N 1052685D05. Circa 2004/2005. After a successful opening this year (complete with compressor start), the heat pump will not shut off (fan and compreasor) when the filter pump shuts off. I believe this is a water pressure switch issue. Can you please confirm and recommend, which water pressure switch part # i need for my aquacal model number.
Thank you