BoilerFaultCodesYour boiler's internal computer has encountered a critical communication error and cannot tell the system to start heating.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Control box or the heat control module (HCM) is defective – control box and connections need checking or HCM might not be inserted properly and need replacing
What causes this fault?
This fault occurs when there is a critical breakdown in communication between the boiler's main brain and its specific configuration chip. It is usually caused by the electronic components failing over time or a loose physical connection prevents the system from reading its own settings. Because the boiler can no longer confirm its identity or safely manage the burner, it shuts down as a precaution.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like F0272 — no call-out fees, no surprises.
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Worcester Bosch CDi Classic is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
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