Fluidra - Varistor S20K275 for Zodiac Z300 TD8 Heat Pump

Fluidra – Varistor S20K275 for Zodiac Z300 TD8 Heat Pump

This is the genuine Fluidra replacement varistor (MOV — Metal Oxide Varistor) for the Zodiac Z300 TD8 reversible pool heat pump. It is a leaded, radial through-hole component mounted on the control board, where it acts as the first line of defence against voltage spikes and transient overvoltage events that can otherwise damage sensitive electronics.

Function & Importance

The S20K275 varistor clamps dangerous voltage transients — caused by lightning surges, power line disturbances, or switching events — before they can reach the control circuitry of the heat pump. Without a functioning varistor, a single voltage spike can permanently damage the PCB, leading to a costly repair or full board replacement. Replacing a worn or failed varistor promptly is one of the most cost-effective ways to protect the entire control system.

Compatibility

This varistor is sourced directly from Fluidra and is specified for the Zodiac Z300 TD8 reversible pool heat pump. If you are unsure whether this part fits your specific unit, please check your heat pump’s model number and cross-reference with the Fluidra spare parts diagram for the Z300 TD8 before ordering.

Installation

Replacement of this component requires desoldering the old varistor from the control board and soldering in the new one. This work should be carried out by a qualified pool technician or electrician with experience in PCB-level repair. Always isolate the heat pump from the mains supply before beginning any work on internal electronics.