How much does it cost to fix Baxi error code E317?

Typical repair cost for the Baxi E317 fault is £250-£450 including labour.

E317 High

Baxi E317 Fault Code

Q: What does the Baxi E317 fault code mean?

Your boiler has detected an issue with the electrical frequency coming from the mains power supply or a fault within its own internal control board.

The Baxi E317 fault code means: your boiler has detected an issue with the electrical frequency coming from the mains power supply or a fault within its own internal control board.. It appears on 24 Baxi models in our database.

Technical description: Wrong power supply (Hz)

What causes the Baxi E317 fault?

This fault occurs when the boiler's internal computer detects that the incoming electricity supply does not match the required 50Hz frequency standard used in the UK. The most common reason is a temporary fluctuation in the national grid or a malfunctioning internal circuit board that can no longer accurately read the incoming power. In some cases, it can also be triggered if the property is running on a backup generator that isn't providing a stable enough current.

This fault is more common during severe winter storms, as extreme weather can cause instability or 'brownouts' in the local electrical grid that disrupt the power frequency.

Typical repair cost £250-£450 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Baxi models that show the E317 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Baxi E317 fault code information on this page is sourced and cross-checked against the official Baxi service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026