How much does it cost to fix Baxi error code H.00.81?

Typical repair cost for the Baxi H.00.81 fault is £100-200 including labour.

H.00.81 Medium

Baxi H.00.81 Fault Code

Q: What does the Baxi H.00.81 fault code mean?

Your boiler has lost its connection to your digital wall thermostat or controller, meaning it cannot receive instructions on when to turn the heating on.

Also written as H0081 — same fault.

The Baxi H.00.81 fault code means: your boiler has lost its connection to your digital wall thermostat or controller, meaning it cannot receive instructions on when to turn the heating on.. It appears on 2 Baxi models in our database.

Technical description: Room unit disconnected When removing the room unit, switch the power supply off and on again and set parameter CP780 =0 to remove the error.

Typical repair cost £100-200 (including labour)

DIY fix possible

Check if your wall controller has batteries and replace them if they are flat.Restart your system by turning the boiler off at the fused spur for 30 seconds and turning it back on.Check if the controller has been moved or if there is interference preventing the wireless signal from reaching the boiler.

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Baxi models that show the H.00.81 fault code

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

Source

Baxi H.00.81 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