E317 High
Your boiler has detected an issue with the electrical frequency coming from the mains power supply or a fault within its internal control board.
Technical description: Wrong power supply (HZ)
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 E317 — no call-out fees, no surprises.
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Parts commonly replaced
- Main Printed Circuit Board (PCB)
- External Power Supply Connection
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