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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 likely meaning, safe first steps, and when to stop troubleshooting.
Browse the parent brand page: Baxi
Most common faults to check first
Common problems in this cluster
PCB and control problems
Start with E50, then compare 5 related code pages in this cluster.
sensor problems
Start with E1, then compare 3 related code pages in this cluster.
fan and flue problems
Start with E160, then compare 1 related code pages in this cluster.
low-pressure problems
Start with 117, then compare 1 related code pages in this cluster.
overheat problems
Start with E110, then compare 1 related code pages in this cluster.
circulation problems
Start with 125 for this common issue pattern.
Common fault categories
PCB and control
6 related codes
sensor
4 related codes
fan and flue
2 related codes
low-pressure
2 related codes
overheat
2 related codes
circulation
1 related codes
Most searched / most useful codes
E110 meaning and fix
the boiler has overheated or reached a high-temperature safety limit.
E131 meaning and fix
the boiler has locked out after an overheating or high-temperature condition.
E160 meaning and fix
the boiler has detected a fan or air-pressure related fault.
133 meaning and fix
The boiler has locked out after failing to light
125 meaning and fix
Water circulation or pump performance issue
128 meaning and fix
Flame detection has been lost during operation
All fault codes in this cluster
20 code pages currently available for this brand and appliance cluster.
| Code | Meaning | Severity |
|---|---|---|
| 117 | System water pressure is too low | medium |
| 118 | System water pressure is too low | medium |
| 125 | Water circulation or pump performance issue | high |
| 128 | Flame detection has been lost during operation | high |
| 130 | Fan, flue, or air pressure sensing problem | high |
| 133 | The boiler has locked out after failing to light | high |
| E1 | A boiler sensor is giving an invalid reading | medium |
| E10 | A boiler sensor is giving an invalid reading | medium |
| E20 | A boiler sensor is giving an invalid reading | medium |
| E28 | Condensate, drainage, or pump protection issue | medium |
| E50 | Control board or internal communication fault | high |
| E53 | A boiler sensor is giving an invalid reading | medium |
| E55 | Control board or internal communication fault | high |
| E78 | Control board or internal communication fault | high |
| E96 | Control board or internal communication fault | high |
| E97 | Control board or internal communication fault | high |
| E98 | Control board or internal communication fault | high |
| E110 | the boiler has overheated or reached a high-temperature safety limit. | high |
| E131 | the boiler has locked out after an overheating or high-temperature condition. | high |
| E160 | the boiler has detected a fan or air-pressure related fault. | high |
Useful guides
Boiler Fault Codes: When to Stop and Call a Professional
Boiler issues need a more cautious approach than most white goods, especially where gas, combustion, or repeated lockouts are involved.
Why Your Boiler Keeps Losing Pressure
Learn the difference between a one-off pressure drop and repeated pressure loss, plus the safe top-up and recheck advice that stays within normal user controls.