L3
Ideal fault code
Ideal L3: no water flow
Check these first, then call an engineer
Ideal describes L3 on Ideal boilers (Ideal's general fault code guide) boilers as: no water flow.
What you can safely do
- Check the pressure gauge reads between 1 and 1.5 bar, and top up if it is low.
- Bleed your radiators to release trapped air, then check the pressure again.
- Reset the boiler.
Call a Gas Safe engineer if
- L3 comes back after these checks.
Find a Gas Safe engineer near you
Opens the official Gas Safe Register search.
Applies to: Ideal boilers (Ideal's general fault code guide). Codes can differ between models, so check your manual.