BoilerFaultCodesTechnical description
Maintenance indicator – number of hours until the next maintenance
What causes this fault?
This code is triggered by an internal countdown timer that tracks the boiler's operating hours or the time elapsed since its last check-up. It is not caused by a mechanical failure or a broken part, but rather a pre-set software limit reaching its end. Once this milestone is hit, the boiler displays the message to ensure safety and efficiency through professional inspection.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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