Safety first: No live wiring work is required for configuration steps, but turn off power if you open the device.

Steps to troubleshoot:

Open the thermostat settings menu or Tuya app and verify the correct sensor mode is selected (e.g., "Room sensor", "Floor sensor", or "Room + Floor").
Check and reset any temperature offset or calibration values to 0°C/0°F.
Perform a factory reset of the thermostat following the user manual, then reconfigure Wi-Fi and schedules.
Compare the thermostat reading with a reliable thermometer placed nearby. If the reading is still far off, the internal sensor may be defective.
If available, update the thermostat firmware via the Tuya app to the latest version.
If none of these steps resolve the E7 error, replace the thermostat or its main PCB.

Thermostat displays E7 and does not respond correctly to setpoint changes; may show extremely low or high temperature values

Possible Causes