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Thermostat temperature suddenly deviating

Posted: 13 Dec 2018, 15:48
by cim96sm5
My thermostat which I installed one month ago has been working fine until now. Suddenly within a few hours the temperature shown by the thermostat increased by 4 degrees which is the delta I see between a second thermometer. I am five hours away so I monitor this with my mobile. Any ideas why the thermometer suddenly is showing a wrong temperature?