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

Typical repair cost for the Baxi DHW FLOW SWITCH fault is £90-180 including labour.

DHW FLOW SWITCH Medium

Baxi DHW FLOW SWITCH Fault Code

Q: What does the Baxi DHW FLOW SWITCH fault code mean?

Your boiler thinks you have a hot water tap turned on even when they are all closed, which may prevent your central heating from working properly.

Also written as DHWFLOWSWITCH — same fault.

The Baxi DHW FLOW SWITCH fault code means: your boiler thinks you have a hot water tap turned on even when they are all closed, which may prevent your central heating from working properly.. It appears on 3 Baxi models in our database.

Technical description: Continuity across W on 5-way connector from PCB. Check if DHW flow switch is blocked.

Typical repair cost £90-180 (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 FLOW SWITCH fault code

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

Source

Baxi DHW FLOW SWITCH 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