Freeze Protection

Freeze protection only helps if it works.

I touched on this subject in my last post and I have written at length about it before. It is worth repeating every year though, so hopefully some of you will read and benefit from it.

We are entering into that cooler time of year that I enjoy so much. For you, this means that you may be closing your pool or you may need to make sure the freeze protection circuitry is working properly. Let’s take a look at how you can test your freeze protection to ensure proper operation.

First and foremost, our company, Epic Pools, can test your pool’s freeze protection for you. Just call us if you would like us to schedule a visit. On the other hand, if you like to do things yourself, it is a pretty simple process to check the freeze protection out. Read on to find out how.

Locate the air temperature sensor.

Freeze ProtectionThis sensor usually will look one of two ways depending on the type of control system you have. The simplest standalone freeze guards will have a copper wire poking out of the box. Some will just be a wire, others will have a “bulb” on the end. The bulb, as I call it, is just a slightly enlarged copper tube about three or four inches long. In some cases, the wire may be coiled up inside the enclosure, not even poking outside of the box. Either way, you must gain access to this copper wire to perform a test on it. If this involves accessing any high voltage compartments, care should be taken to not be shocked.

Freeze ProtectionThe other type of sensor is standard with most pool automation systems. These systems include Zodiac’s AquaLink RS, Hayward’s AquaLogic or ProLogic, and Pentair’s Intellitouch systems. There are two temperature sensors on these control systems. One checks the water temperature and the other checks the air. We are looking for the air sensor. Typically this sensor is hanging somewhere near the power center box at the pool equipment. Most of the time, it will be located directly underneath the box and may not be attached to anything.

Get a glass of icewater.

Next, you will need to turn your system off. If you have an automation system, make sure it is in Auto mode and not Service or Time Out. Take your glass of icewater to where the temperature sensor is and stick the sensor into the water. Within 15 to 20 seconds (usually much less), the pump should turn on, indicating proper function of the freeze protection. Once the pump turns on, pull the sensor out of the icewater and allow it to warm back up, at which point the pump will turn back off.


That is it! You have tested the freeze protection. One word of caution – even if the pump turns on and operates properly, your valves all need to be set correctly so that water is flowing through all plumbing. If any pipe needs to be left off, it should be winterized properly to ensure it doesn’t freeze. If anything did not work for you or you just need help, give us a call and we will check things out further.

An Atlanta area native, Shawn began servicing pools in 1998 and has not stopped. Years of experience have provided Shawn with a wealth of knowledge and opinions about all types and brands of pool equipment.

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