I'm not sure what you're asking here but I'll take a stab at providing an answer for you.
I. if you're asking about an alarm for low internal water temperature inside the boiler - there is nothing
2. If you're asking about an alarm for low ambient temperature, the thermostat will send a notification if the ambient temperature falls below the set safety temperature. When the safety temperature is reached, it will also command heat even if the thermostat is set to off.
