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Baxi Boiler Fault Codes

Browse the available Baxi boiler fault codes in one place, then open the exact code page for the documented meaning, evidence limits and safe next steps.

Definitions can vary by model and region. Some codes remain unconfirmed; check the complete display, exact model and the page's sources before taking action.

Browse the parent brand page: Baxi or compare across brands in the boiler codes across brands.

Fault codes

Code categories

Guides linked below

Code pages to start with

Meaning unconfirmed; exact model evidence required. Confirm the complete display and exact model with the manufacturer.

E20

Central-heating NTC sensor circuit fault. Applies only within the model and regional limits on the code page.

Browse code categories

power and control codes

4 pages in this category. Open E131 as one example and check its model limits.

sensor codes

4 pages in this category. Open E28 as one example and check its model limits.

fan and flue codes

3 pages in this category. Open 130 as one example and check its model limits.

PCB and control codes

2 pages in this category. Open E55 as one example and check its model limits.

pressure and level codes

2 pages in this category. Open 117 as one example and check its model limits.

circulation codes

Open 125 for the documented meaning and its limits.

Code categories in this library

Counts refer to published code pages, not how often an appliance develops a fault.

power and control (4)

sensor (4)

fan and flue (3)

PCB and control (2)

pressure and level (2)

circulation (1)

More code pages

E128 meaning and guidance

Frequent flame loss when the full code is E128

E28 meaning and guidance

Flue-temperature NTC circuit fault in the applicable Baxi table

117 meaning and guidance

High system pressure when the full display is E117

118 meaning and guidance

Low system pressure when the full code is E118

125 meaning and guidance

Circulation fault when the full code is E125

130 meaning and guidance

Flue thermostat trip when the full code is E130

133 meaning and guidance

Gas supply or ignition problem when the full code is E133

E1: model confirmation needed

Meaning unconfirmed; exact model evidence required

E10 meaning and guidance

External-probe fault in the applicable Baxi table

E110 meaning and guidance

Maximum-temperature or safety-thermostat trip

E131 meaning and guidance

Power removed following an E125 or E130 fault

E160 meaning and guidance

Fan fault

All fault codes in this cluster

20 code pages currently available for this brand and appliance. A severity label does not establish whether an appliance is safe to use.

Code	Meaning	Issue type	Severity
117	High system pressure when the full display is E117	pressure level	Not assessed
118	Low system pressure when the full code is E118	pressure level	Not assessed
125	Circulation fault when the full code is E125	circulation	Not assessed
130	Flue thermostat trip when the full code is E130	fan flue	Not assessed
133	Gas supply or ignition problem when the full code is E133	ignition	Not assessed
E1	Meaning unconfirmed; exact model evidence required	unconfirmed	Not established
E10	External-probe fault in the applicable Baxi table	sensor	Not assessed
E20	Central-heating NTC sensor circuit fault	sensor	Not assessed
E28	Flue-temperature NTC circuit fault in the applicable Baxi table	sensor	Not assessed
E50	Domestic-hot-water NTC sensor circuit fault	sensor	Not assessed
E53	Flue obstruction in the cited DUO-TEC fault table	fan flue	Not assessed
E55	Electronic board has not been programmed	pcb control	Not assessed
E78	Gas-valve calibration voltage-limit warning	power control	Not assessed
E96	Shutdown caused by supply-voltage fluctuation	power control	Not assessed
E97	Incorrect electrical-supply frequency	power control	Not assessed
E98	Internal main electronic-board error	pcb control	Not assessed
E110	Maximum-temperature or safety-thermostat trip	overheat	Not assessed
E128	Frequent flame loss when the full code is E128	flame loss	Not assessed
E131	Power removed following an E125 or E130 fault	power control	Not assessed
E160	Fan fault	fan flue	Not assessed

Useful guides

Boiler Fault Codes: When to Stop and Call a Professional

First separate an emergency from a routine fault. A code needs the exact model and full display; it cannot by itself establish a safe reset or identify a part to replace.

Why Your Boiler Keeps Losing Pressure

Use the pressure target and filling instructions for your exact boiler and installation. Repeated pressure loss needs investigation; a low reading alone does not identify a failed component.