F.70 High
Your boiler’s control computer has lost its identity settings, meaning it no longer knows which specific model it is and has shut down as a safety precaution.
Technical description: Invalid product code (DSN)
Typical repair cost: £100-£350 (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 F.70 — no call-out fees, no surprises.
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Parts commonly replaced
- Main Printed Circuit Board (PCB)
- User Interface (Display)
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