"The frost protection mode is integral to the appliance and functions only with the selector switch in the domestic hot water and central heating position. If the system temperature falls below 5°C then the boiler will fire on its minimum setting until a flow temperature of 30°C is reached. Further protection can be incorporated by using a system frost thermostat".
There is no separate frost thermostat shown in the parts list. I think it must rely on the normal temperature sensor and the necessary electronics to work.
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