Thermostat displays E11 and remote wireless sensors are not detected

Safety: Only low-voltage and battery-powered components are involved; no breaker work is required.

• Replace sensor batteries: Open the American Standard wireless sensor and replace batteries with the recommended type, observing polarity. Re-seat the battery cover firmly.
• Re-pair the sensor: On the thermostat, go to Accessories → Sensors and follow prompts to add or re-pair the wireless sensor. Press the pairing button on the sensor if required.
• Reduce distance and obstacles: Move the sensor closer to the thermostat or reduce the number of walls between them. Avoid placing sensors near metal cabinets or appliances that block RF signals.
• Check for interference: If you have many Wi‑Fi or Zigbee devices, try changing your router’s Wi‑Fi channel or moving high-power transmitters away from the thermostat.

Note: If multiple sensors fail to connect, the thermostat’s wireless radio may be defective.