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Worcester Bosch Boiler Fault Codes
Browse the available Worcester Bosch 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: Worcester Bosch or compare across brands in the global boiler fault-code hub.
Fault codes
26
Issue categories
6
Related guides
1
Most common faults to check first
Common problems in this cluster
sensor problems
Start with 102, then compare 6 related code pages in this cluster.
circulation problems
Start with A1, then compare 3 related code pages in this cluster.
overheat problems
Start with 101, then compare 3 related code pages in this cluster.
flame-loss problems
Start with 232, then compare 2 related code pages in this cluster.
fan and flue problems
Start with C6, then compare 1 related code pages in this cluster.
low-pressure problems
Start with 224, then compare 1 related code pages in this cluster.
Common fault categories
sensor (7)
circulation (4)
overheat (4)
flame-loss (3)
fan and flue (2)
low-pressure (2)
Most searched / most useful codes
101 meaning and fix
Boiler has detected an overheat condition
110 meaning and fix
Model-dependent overheat or high-limit-style lockout
200 meaning and fix
Heating demand or controls signal issue
EA meaning and fix
The boiler failed to establish a flame
A1 meaning and fix
The boiler is detecting poor water circulation
229 meaning and fix
The boiler has overheated or hit a high temperature limit
232 meaning and fix
Flame detection has been lost during operation
233 meaning and fix
Flame detection has been lost during operation
268 meaning and fix
Water circulation or pump performance issue
286 meaning and fix
Water circulation or pump performance issue
296 meaning and fix
Flame detection has been lost during operation
297 meaning and fix
Gas supply control or gas valve issue
All fault codes in this cluster
26 code pages currently available for this brand and appliance cluster.
| Code | Meaning | Issue type | Severity |
|---|---|---|---|
| 101 | Boiler has detected an overheat condition | overheat | high |
| 102 | Flow or return temperature sensor fault | sensor | medium |
| 104 | System pressure or circulation condition is abnormal | circulation | medium |
| 110 | Model-dependent overheat or high-limit-style lockout | overheat | high |
| 200 | Heating demand or controls signal issue | power control | high |
| 201 | Hot water sensor or temperature signal issue | sensor | medium |
| 202 | Flow temperature reading is outside the expected range | sensor | medium |
| 204 | Return temperature reading is outside the expected range | sensor | medium |
| 208 | A boiler sensor is giving an invalid reading | sensor | medium |
| 224 | System water pressure is too low | low pressure | medium |
| 227 | System water pressure is too low | low pressure | medium |
| 229 | The boiler has overheated or hit a high temperature limit | overheat | high |
| 232 | Flame detection has been lost during operation | flame loss | high |
| 233 | Flame detection has been lost during operation | flame loss | high |
| 268 | Water circulation or pump performance issue | circulation | high |
| 281 | A boiler sensor is giving an invalid reading | sensor | medium |
| 286 | Water circulation or pump performance issue | circulation | high |
| 295 | A boiler sensor is giving an invalid reading | sensor | medium |
| 296 | Flame detection has been lost during operation | flame loss | high |
| 297 | Gas supply control or gas valve issue | gas valve | high |
| A1 | The boiler is detecting poor water circulation | circulation | high |
| C6 | Fan, flue, or air pressure sensing problem | fan flue | high |
| CE | Fan, flue, or air pressure sensing problem | fan flue | high |
| D1 | Control board or internal communication fault | pcb control | high |
| E9 | The boiler has overheated or hit a high temperature limit | overheat | high |
| EA | The boiler failed to establish a flame | ignition | high |