What should I do if the thermostat temperature reading deviates from the actual room temperature?
If the deviation between the thermostat's real-time temperature and the actual temperature exceeds 1.5°C, the thermostat needs to be calibrated. Use parameter P03 to calibrate the temperature sensor. When calibrating, avoid touching the thermostat cover and the temperature sensor head as this may affect the calibration result. (Page 28)
From the official Bosch RT20 Rf Room Thermostat manual, page 28
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