How much does it cost to fix Baxi error code E385?

Typical repair cost for the Baxi E385 fault is £100-350 including labour.

E385 High

Baxi E385 Fault Code

Q: What does the Baxi E385 fault code mean?

Your boiler has stopped working because it isn't receiving enough electrical power from the mains supply to run safely.

The Baxi E385 fault code means: your boiler has stopped working because it isn't receiving enough electrical power from the mains supply to run safely.. It appears on 24 Baxi models in our database.

Technical description: Low voltage (less than 195v)

What causes the Baxi E385 fault?

This fault occurs when the electrical supply from your home to the boiler drops below the level required for the internal components to operate safely. The most common reason is a wider issue with the local power grid or a faulty printed circuit board that can no longer correctly process the incoming voltage. In some cases, loose wiring or heavy demand from other large appliances on the same circuit can also cause this drop.

This fault is more common during periods of extreme cold or high regional energy demand, as heavy strain on the national grid can lead to temporary brownouts or voltage fluctuations.

Typical repair cost £100-350 (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 E385 fault code

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

Source

Baxi E385 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