Jandy Adjustable Water Pressure Switch, R3001000

The Jandy R3001000 is the adjustable water pressure switch used on Jandy heat pumps. It is the genuine Jandy part.

What it does

A heat pump must never fire without water moving through it. The pressure switch is the device that proves that flow: it senses water pressure in the unit and closes a circuit that tells the control it is safe to start. Everything downstream of that, from the compressor to the heat exchanger, depends on the switch being honest.

Adjustable trip point

This version is adjustable, so the pressure at which it makes and breaks can be set rather than left at a factory fixed value. That is useful where pipe runs, pump sizing or elevation give a pressure at the unit that a fixed switch reads badly.

Fitment

It is listed as a replacement part for the Jandy EE-Ti heat pumps, and Jandy parts listings also carry it against the AE-Ti series. Check the model number on your unit against both before ordering.

Diagnosing it

A heat pump that reports no flow while the pump is clearly running points at either a genuine flow restriction or a failed switch. Check the filter, the valves and the strainer basket first, because a switch doing its job correctly looks identical to a broken one until you rule out the real causes.