BoilerFaultCodesHeatline P.06 Fault Code
Also written as P06 — same fault.
The Heatline P.06 fault code means: your boiler is currently running an automatic air-removal cycle to clear trapped air from the system pipes.. It appears on 2 Heatline models in our database.
Technical description: Venting the installation
DIY fix possible
Wait for the cycle to finish automatically as the boiler completes the air purgeCheck your radiators for cold spots once the boiler returns to normal operationBleed any radiators that feel cold at the top if necessary
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Heatline models that show the P.06 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Heatline P.06 fault code information on this page is sourced and cross-checked against the official Heatline service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026