and integrated furnace controls

What is the primary cause of diaphragm failure in these valves

it provides a reliable seal at differential pressures up to 15 PSI

dirty blower wheel

Ranco O12-1502 Pressure Control Els PW 17895 and integrated furnace controlsThe Ranco O12 1502 is a professional grade dual pressure control engineered for heavy duty commercial refrigeration and HVAC applications. This SPST pressure switch consolidates high side protection and low side cycling into a single NEMA 1 enclosure, streamlining installation and improving system reliability. The low pressure side features an adjustable cut in range of 12" Hg to 50 PSI with a 5 to 35 PSI differential, while the high pressure side