Freezing
temperatures and
non circulating swimming pools is a bad combination. One of the most common problems found with freeze guards is that the
thermostat is not
registering the freezing temps or that the thermostat is
registering incorrectly. Either way if it is below freezing and your pump is not running, costly freeze damage is
likely to occur. Note that it is common for the freeze guard to
register about a 5 degree difference from the outside temperature. This is why the freeze guard should be set to 38 to compensate. If set properly and you have to set the thermostat 10 degrees higher just to turn the pump on, it might be time to replace the
thermostat. The good news is it is generally an easy replacement that the
average handy home owner can do.