How much does it cost to fix Baxi error code DHW Fault?

Typical repair cost for the Baxi DHW Fault fault is £120-£250 including labour.

DHW Fault Medium

Baxi DHW Fault Fault Code

Q: What does the Baxi DHW Fault fault code mean?

Your boiler has detected a problem with the domestic hot water system, meaning you likely have no hot water but your central heating may still function.

Also written as DHWFAULT — same fault.

The Baxi DHW Fault fault code means: your boiler has detected a problem with the domestic hot water system, meaning you likely have no hot water but your central heating may still function.. It appears on 3 Baxi models in our database.

Technical description: Indicator: Upper LED On, Middle LED Flash, Lower LED On, Bottom LED Off. Fault in Domestic Hot Water circuit.

Typical repair cost £120-£250 (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 DHW Fault fault code

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

Source

Baxi DHW Fault 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