How to Change a Pool Freeze Guard

A freeze guard is part of certain pool timers designed for pools that are left open through the year. You may also see it referred to as a freeze protection thermostat. The freeze guard overrides the timer when the temperature drops below 38 degrees Fahrenheit. The pool pump will turn on, circulating the pool water and thus preventing it from freezing. While a freeze guard is not a heater, it will usually help protect your pool during cold spells. It will keep the pump running until the temperature rises above freezing.

Screwdriver
Hammer

Instructions

- 1
  Turn the electricity off. Shut off the power switch at the breaker sub-panel.
- 2
  Take a digital photo of the timer. This will help you when it's time to install a new one.
- 3
  Disconnect the wires to the freeze guard timer. Use a screwdriver to loosen the screws that keep the wires in place.
- 4
  Unscrew the box from the mounting surface or wall. Remove the gray conduits that are at the bottom of the timer/freeze guard box.
- 5
  Hold the new freeze guard up to the mounting surface or wall. Install the nuts and bolts through the pre-cut holes at the base of the new box. Turn them by hand to tighten slightly.
- 6
  Hammer a screwdriver through the pre-cut holes around the switch box to make way for the wires to pass through. Remove the tab from the hole.
- 7
  Pull the wiring through the box. Mount the freeze guard to the mounting surface by screwing in the screws used on the old box.
- 8
  Look at the photo you took of the old box. Copy the wiring pattern on the new switch.
- 9
  Turn the breaker back on.

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