BoilerFaultCodesBaxi E2 Fault Code
The Baxi E2 fault code means: your boiler is struggling to move water through the system, which is usually caused by trapped air or a blockage in the pipes.. It appears on 1 Baxi model in our database.
Technical description: Circulation Bleed radiators, check system water pressure; if low refill via filling loop Bleed radiators, check system water pressure; if low refill via filling loop
What causes the Baxi E2 fault?
This fault occurs when water cannot travel through the boiler’s internal heat exchanger quickly enough to carry heat away. The most common reasons are trapped air pockets creating a blockage, a buildup of sludge in the system, or the internal pump failing to spin correctly.
This issue is frequently seen in autumn when heating systems are switched back on after being idle all summer, which can cause internal pump components to seize.
DIY fix possible
Check that the boiler pressure is between 1 and 1.5 barTurn off the heating and use a radiator key to bleed air from all radiatorsEnsure all radiator valves (TRVs) are fully openReset the boiler using the reset button
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Baxi models that show the E2 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Baxi E2 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