D.93 High
Your boiler's internal computer has lost its identity settings and doesn't know which specific model it is supposed to be.
Technical description: DSN appliance variant setting
Typical repair cost: £100-280 (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 D.93 — no call-out fees, no surprises.
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Parts commonly replaced
- Printed Circuit Board (PCB)
- Display Interface
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