Medium
E193 on Baxi Duo-tec Combi

Your boiler has detected trapped air bubbles that are preventing the water from circulating correctly, causing it to shut down to protect itself.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description

Air in system (pump over-run)

DIY fix possible

Turn off your boiler and wait for it to fully cool downGo around your home and bleed all radiators using a radiator key to release trapped airCheck the pressure gauge on the front of the boiler and top up to 1.5 bar using the filling loopRestart the boiler to see if the error clears

Find a Gas Safe engineer
Search the official register →

Related fault codes

E119View →E125View →

Related guides you might find useful

Boiler keeps losing pressure

Six most common causes of dropping pressure.

Read →

Banging / kettling / whistling noise

Each noise points to a different fault.

Read →

Radiators cold at the bottom

Sludge build-up — needs flushing, not bleeding.

Read →