BoilerFaultCodesBaxi E110 Fault Code
The Baxi E110 fault code means: your boiler has reached an excessively high temperature and has shut down as a safety precaution to prevent damage.. It appears on 10 Baxi models in our database.
Technical description: Thermostat operated safety
What causes the Baxi E110 fault?
This fault occurs when the water inside the boiler gets too hot, triggering a safety switch to shut the system down. The most common reasons are a pump failure preventing water from moving through the unit, or a internal blockage like air or sludge that is trapping heat in the heat exchanger.
This issue often appears when you first turn the heating back on in autumn, as circulation pumps can seize up if they have been inactive throughout the summer.
DIY fix possible
Check that all radiator valves are fully open to allow water to circulate.Ensure your system pressure is between 1.0 and 1.5 bar on the front gauge.Try resetting the boiler by turning the selector knob to the 'R' position for five seconds.
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Baxi models that show the E110 fault code
Click a model for the full fault code list and model-specific repair notes.
- BBU 45/4 Repair: £120-250
- Duo-tec Combi ErP Repair: £120-250
- Duo-tec Combi GA Repair: £120-250
- Duo-tec Combi HE Repair: £120-250
- Duo-tec Combi HE A Repair: £120-250
- Luna 3 Comfort Repair: £100-280
- Megaflo System Repair: £120-250
- Platinum Combi Repair: £100-£280
- Platinum Combi HE Repair: £100-350
- Platinum Heat Repair: £100-350
Source
Baxi E110 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