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20th order by Robert from QLD
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Replacement antifreeze thermostat sensor for the Suburban ST60A heater's active freeze-protection system. This is the sensor identified as item 7 in the parts diagram, not the adjacent manual-reset limit switch or either water-temperature probe.
Freeze protection requires gas and electrical power to remain available to the heater. The sensor does not replace draining or winterising the system when it will be stored in freezing conditions.