Zodiac - Low pressure switch Z900 - R07845

Zodiac – Low pressure switch Z900 – R07845

The Zodiac R07845 is a genuine OEM low pressure switch designed specifically for the Zodiac Z900 series pool heating and hydraulic systems. A low pressure switch is a safety and control component that monitors the water pressure within the hydraulic circuit of a pool system. When water pressure drops below a defined threshold — for example due to a blocked filter, closed valve, or insufficient flow — the switch triggers a signal that can interrupt operation or activate an alarm. This protects other components such as the heater or pump from running dry or under unsafe conditions.

As an original Zodiac spare part, the R07845 is manufactured to the precise tolerances and electrical specifications required by the Z900 platform, ensuring reliable and accurate pressure sensing without the risk of incorrect switching points or premature failure that can come with non-OEM alternatives.

Technical characteristics and installation

The low pressure switch in a pool heating or hydraulic system is typically installed inline or on a tee fitting within the hydraulic loop, positioned to sense live system pressure. It is a normally open or normally closed contact device that changes state when pressure crosses its calibrated set point. In the context of the Zodiac Z900 system, this switch forms part of the safety interlock chain, protecting the heat exchanger and associated components from damage caused by insufficient water flow or low pressure conditions. Installation requires connection to the hydraulic circuit at the designated pressure port and integration with the electrical control circuit of the Z900 unit. Because this is a genuine Zodiac replacement component, it is engineered to integrate directly with the Z900 control logic without requiring adaptation or recalibration.

Suitability and application

This low pressure switch is intended exclusively as a replacement part for Zodiac Z900 series pool systems. It is suited to residential and light commercial pool installations where the Z900 platform is already in use. If your existing low pressure switch has failed — symptoms typically include the system refusing to start, shutting down unexpectedly, or displaying a low pressure fault code — replacing it with this genuine Zodiac component is the recommended solution. This part is not a universal pressure switch and should only be used as a direct replacement within compatible Z900 equipment. Always ensure the pool system is fully depressurised and powered off before carrying out any replacement work, and consult the Z900 installation or service manual for wiring and mounting guidance.