Hayward - Temperature sensor 3 wires black - 7019321

Hayward – Temperature sensor 3 wires black

This genuine Hayward OEM temperature sensor uses a 10K ohm thermistor and a dedicated 3-wire black harness to deliver precise water temperature readings to Hayward salt electrolysis controllers — data the system relies on to modulate chlorine output safely across the season. When the sensor detects water temperatures dropping towards the lower threshold, the controller automatically scales back production, protecting both the electrolytic cell and the pool’s water chemistry without any manual intervention. Fitting within the Hayward AquaRite, AquaLogic, AquaPlus, and ProLogic ecosystem, this is the correct OEM replacement when a faulty sensor triggers a temperature fault or erratic chlorination behaviour.

Role in chlorination control

The temperature sensor is an active safety and efficiency input for Hayward salt chlorine generators: the controller uses its readings to limit or suspend electrolysis when water is too cold for effective chlorine production. A failing or disconnected sensor can cause the unit to display a sensor fault, restrict output, or stop sanitising altogether, making a like-for-like OEM replacement essential for restoring correct closed-loop operation.

Genuine OEM fit & wiring

Sourced directly through Hayward’s official distribution, this 3-wire black sensor matches the original connector and harness configuration of the supported control boards. Unlike 2-wire aftermarket alternatives, the 3-wire variant ensures full signal integrity on automation platforms that require it — particularly relevant on integrated systems where a mismatched sensor can generate persistent fault codes. No crimping or wiring modification is required; the sensor plugs directly into the designated terminal on the controller housing.

Compatibility & installation

This sensor is designed for the Hayward salt electrolysis product family, including AquaRite, AquaLogic, AquaPlus, and ProLogic automation models. Installation is straightforward — the sensor is clamped to the pipework between pump and filter or fitted into the port on the salt cell, and the wiring terminated in the control enclosure. Always isolate mains power before working inside the controller cabinet, and consult your system’s wiring diagram to confirm the correct terminal block positions.