On Baxi boilers, fault code E125 means: Water circulation fault. The boiler has locked out for safety. Try the safe checks below and one reset; if the code returns, call a qualified gas engineer.
Can I keep using the boiler?
The boiler has locked out for safety. Try the safe checks below and one reset; if the code returns, call a qualified gas engineer.
Common causes
- Air in the system or blocked circulation (closed valves, sludge)
- Faulty pump or pump blocked by debris
- Water leak in the heating system or pressure not topped up
How to fix it
- Make sure the radiator and boiler valves are open
- Bleed the radiators to release trapped air, then re-check the pressure
- Top up the pressure to about 1–1.5 bar with the filling loop or tap (see your manual)
- Have a qualified gas engineer inspect the boiler; never open gas or flue parts yourself
Frequently asked questions
What does Baxi error E125 mean?
On Baxi boilers, fault code E125 means: Water circulation fault.
How do I fix Baxi error E125?
Start with these steps: Make sure the radiator and boiler valves are open; Bleed the radiators to release trapped air, then re-check the pressure; Top up the pressure to about 1–1.5 bar with the filling loop or tap (see your manual); Have a qualified gas engineer inspect the boiler; never open gas or flue parts yourself.
Is it safe to use the boiler with fault E125?
Severity: Medium. The boiler has locked out for safety. Try the safe checks below and one reset; if the code returns, call a qualified gas engineer.