F50 High
Your boiler’s main control board has detected an internal computer failure, which means the system cannot manage itself safely and has stopped working.
Technical description: Controller DBM23B error – controller could have an internal error
Typical repair cost: £280-450 (including labour)
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Protect yourself from future repair bills
A boiler cover plan would cover faults like F50 — no call-out fees, no surprises.
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Parts commonly replaced
- DBM23B Printed Circuit Board (PCB)
- Control Board Wiring Loom
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