Thermostat shows E07 and cannot control underfloor heating temperature correctly

Safety first: Floor sensors are low voltage, but they may be routed near mains cables. Isolate power to the UFH controller before opening junction boxes.

• Check configuration: In the Wiser app or thermostat menu, confirm that a floor sensor is enabled only if one is actually installed, and that the correct sensor type is selected.
• Inspect sensor cable: At the thermostat or UFH controller, gently tug the floor sensor wires to ensure they are firmly clamped in the terminals.
• Measure resistance: With power off, disconnect the floor sensor and measure its resistance using a multimeter. Compare with the manufacturer’s chart (typically 5–20 kΩ at room temperature). Infinite or near-zero resistance indicates a fault.
• Check for damage: If the sensor cable runs in a conduit, inspect accessible sections for crushing or drilling damage.
• Replace sensor: If the probe is faulty, install a new compatible Wiser floor sensor. If the cable is embedded and cannot be replaced, configure the thermostat to use air temperature only (if allowed) and monitor floor temperature carefully.