BoilerFaultCodesBaxi DHW FLOW SWITCH Fault Code
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 5 Baxi models in our database.
Technical description: Continuity across W on 5-way connector from PCB. Check if DHW flow switch is blocked.
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 7 July 2026