Your boiler has lost its wireless connection with your thermostat or remote control, meaning they can no longer talk to each other to manage your heating.

Climatic RF communication fault

What causes this fault?

This fault occurs when the invisible radio signal between your thermostat and the boiler is interrupted or lost entirely. The most common reason is that the batteries in your wall controller have died, but it can also be caused by new electronic devices or thick walls blocking the signal to the receiver. Effectively, the boiler has gone into a safety mode because it no longer knows whether your home is too hot or too cold.