BoilerFaultCodesGlow-worm P.00 Fault Code
Also written as P00 — same fault.
The Glow-worm P.00 fault code means: your boiler is currently running a routine automatic process to clear trapped air from its internal pipes to help it heat your water and radiators more efficiently.. It appears on 1 Glow-worm model in our database.
Technical description: Purging the domestic hot water and heating circuit
DIY fix possible
Wait 5 to 10 minutes for the automatic process to complete.Observe if the display automatically returns to the current temperature reading.If the code persists for over 30 minutes, switch the boiler off at the mains for one minute and turn it back on to restart the system.
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Glow-worm models that show the P.00 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Glow-worm P.00 fault code information on this page is sourced and cross-checked against the official Glow-worm service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026