Thermostat displays F.17 and shows incorrect room temperature

Safety: Only user‑level configuration is required.

Steps:

• Place a reliable digital thermometer near the thermostat and allow both to stabilise for at least 15 minutes.
• Compare readings. If the thermostat consistently reads higher or lower by a fixed amount, adjust the temperature offset in the thermostat settings (often called calibration or room temp correction).
• Relocate the thermostat away from radiators, TVs, direct sunlight, or external doors that can skew readings.
• After adjustment, monitor for several hours to confirm that the displayed temperature is now accurate.

Remedy:

• If F.17 persists and the thermostat cannot be calibrated within a reasonable range, the internal sensor may be defective. Replace the thermostat head.