BoilerFaultCodesTechnical description
Parameter limits. Automation settings.
What causes this fault?
This fault occurs when the boiler's internal memory experiences a digital glitch or data corruption, causing its stored safety settings to become scrambled. The most common reason is an aging electronic control board that can no longer hold its configuration, or a failure in the small data plug that tells the boiler which specific model it is.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register →