How much does it cost to fix Baxi error code E164?

Typical repair cost for the Baxi E164 fault is £120-210 including labour.

E164 High

Baxi E164 Fault Code

Q: What does the Baxi E164 fault code mean?

Your boiler is struggling to accurately detect the water pressure in the system, which is preventing it from heating up.

The Baxi E164 fault code means: your boiler is struggling to accurately detect the water pressure in the system, which is preventing it from heating up.. It appears on 24 Baxi models in our database.

Technical description: Pressure sensor fault

What causes the Baxi E164 fault?

This fault occurs when the boiler's internal computer loses reliable communication with the sensor that monitors water pressure. The most common reason is a buildup of system sludge or debris blocking the sensor's opening, though it can also be caused by a loose electrical connection or a failing electronic component within the sensor itself.

Typical repair cost £120-210 (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 E164 fault code

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

Source

Baxi E164 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