Medium
51 on Alpha E-Tec Plus 10 / 18

Your boiler has lost its wireless connection to the external temperature controller, meaning it may not know when to turn on or off.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description

Error between communication of the Climatic transmitter and boiler receiver

DIY fix possible

Check the batteries in your wall-mounted thermostat or Climatic controller.Ensure the controller is within range of the boiler and there are no large metal objects blocking the signal.Try resetting the boiler and re-pairing the transmitter according to your manual.

Find a Gas Safe engineer
Search the official register →

Related guides you might find useful

Yellow or orange flame — CO safety

Safety-critical — turn off, read this.

Read →

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →