E154
Flow/return plausibility fault
The boiler has detected implausible flow and return temperature behaviour.
What this code means
The boiler has detected implausible flow and return temperature behaviour.
Possible causes
- Flow or return sensor issue
- Poor circulation
- Incorrect sensor readings or installation
- Pump/valve restriction
Common symptoms
- E154 displayed
- Boiler may lock out or heat incorrectly
Checks to make
- Check system pressure
- Arrange qualified diagnosis of sensors and circulation
Safety
- Do not remove the boiler casing or work on gas, combustion, flue or internal electrical components unless appropriately qualified. If gas is suspected, follow the national gas-emergency procedure.
Model notes
Baxi fault-code availability varies by boiler family and control platform.