Bosch EasyControl displays error C7 and cannot detect paired Bosch Smart Radiator Thermostats or wireless room sensors.

Safety first: Wireless troubleshooting is low risk; do not open any sealed electronic modules.

• 1. Check accessory power: On each Bosch Smart Radiator Thermostat, replace the batteries with fresh, high-quality alkaline cells, observing correct polarity.
• 2. Reduce distance and obstacles: Temporarily move the EasyControl closer to the affected radiator thermostats (if possible) or test with a thermostat in the same room as the EasyControl to see if communication is restored.
• 3. Minimize interference: Keep the EasyControl away from large metal objects, Wi‑Fi routers, cordless phone bases, and microwave ovens. Reposition the router or EasyControl if they are very close together.
• 4. Re-pair devices: In the EasyControl app, remove the problematic accessory and then follow the pairing procedure again. Ensure the accessory is in pairing mode (LED indications per its manual).

Professional help: If multiple accessories fail to connect even at close range, the EasyControl’s radio transceiver may be faulty and the main unit may require replacement.