What does the Baxi 600 Series E125 fault code mean?
The E125 fault code on the Baxi 600 Series indicates a blocked flue, which prevents the safe expulsion of combustion gases from the boiler. This issue can lead to dangerous situations, including the risk of carbon monoxide poisoning.
Common Causes
- Debris in the Flue: Leaves, bird nests, or other obstructions can block the flue, restricting airflow.
- Flue Installation Issues: Incorrect installation or bends in the flue can impede the proper flow of gases.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer to address this issue, as working with gas appliances can be hazardous. Attempting to fix a blocked flue without proper training may lead to serious safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving a blocked flue on a Baxi 600 Series boiler is approximately £150 to £300. This includes the cost of a Gas Safe Engineer’s visit and any necessary repairs or cleaning of the flue system.