Error code
Baxi Boiler Fault Code E28
Condensate, drainage, or pump protection issue The most likely cause is condensate pipe restriction or freezing. Check first: only carry out external checks that are clearly described by the manufacturer.
Quick answer
E28: what does it mean and how to fix
What does it mean?
Condensate, drainage, or pump protection issue
How to fix first
Check the manual for any weather-related condensate guidance intended for homeowners.
Why is this happening?
Condensate pipe restriction or freezing
When should I call an engineer?
If the issue is not an obvious and safely accessible condensate problem, stop and arrange a qualified heating engineer.
What does this error code mean?
Baxi boiler fault code E28 usually points to a condensate, drainage, or related protection issue that is stopping the boiler from operating normally.
In practice, E28 is commonly linked to Condensate pipe restriction or freezing, Drainage-related lockout, or Associated sensor or pump protection fault.
Start with this safe check: Check the manual for any weather-related condensate guidance intended for homeowners. If the code returns, the fault worsens, or the appliance does not behave normally, if the issue is not an obvious and safely accessible condensate problem, stop and arrange a qualified heating engineer.
Why is this happening?
- Condensate pipe restriction or freezing
- Drainage-related lockout
- Associated sensor or pump protection fault
How to fix this safely
- Check the manual for any weather-related condensate guidance intended for homeowners.
- Only carry out external checks that are clearly described by the manufacturer.
- Stop and book an engineer if the boiler remains locked out.
Reset steps
- Use the standard reset only after any permitted user checks are complete.
- Do not keep resetting if the code returns.
When to call an engineer
If the issue is not an obvious and safely accessible condensate problem, stop and arrange a qualified heating engineer.
Safety warning
Do not dismantle the boiler or sealed drainage components. Use only user-level checks described by the manufacturer.
Useful hub links
Related condensate fault codes
Relevant guide
Frequently asked questions
Can I keep resetting a Baxi boiler with E28?+
No. If E28 returns after one standard user reset, stop there and arrange a qualified engineer if the manual gives no safe next step.
Is E28 something I can repair myself?+
Boiler faults should be treated cautiously. Stay within the user checks in the manual, and leave gas, combustion, and internal boiler repairs to a qualified professional.