F.70 High
Your boiler's computer and internal display screen are no longer communicating correctly because they haven't been configured to recognize each other.
Technical description: Invalid device specific number (DSN)
Typical repair cost: £80-£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.
*Affiliate links — we may earn a commission at no extra cost to you. Prices shown are starting prices.
Parts commonly replaced
- Printed Circuit Board (PCB)
- User Interface (UI) Display
*Affiliate links — we may earn a commission at no extra cost to you.