Baxi · 600 Combi
E125 boiler fault code
Baxi 600 Combi legacy generation
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What E125 means
Primary water-circulation fault.
Safe check
Read and note E125 and any visible pressure reading. Do not try to vent, dismantle or free boiler components.
When to contact an engineer
Arrange a Gas Safe registered engineer to inspect the primary circulation system and internal pump or electrical components.
Safety notice
A boiler fault code alone is not a gas or carbon-monoxide emergency. If you smell gas, a CO alarm sounds, anyone feels unwell, or there is an unsafe flame, leave and call 0800 111 999 from outside.
Source and provenance
- Baxi Professional error-code table · legacy Baxi 600 Combi & System group
professional error-code table
Checked 29/09/2026; the online table publishes no revision