E18
Alpha
Flue Configuration / Sensor Fault
Boiler displays E18; may occur when the flue system has been altered or extended.
Advertisements
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Advertisements
Possible Causes
Incorrect flue length or configuration, Blocked flue sensor, Faulty flue temperature sensor, Loose flue sensor wiring
How to Fix / Troubleshooting
Safety: Flue work must comply with gas regulations. Do not dismantle the flue unless you are qualified.
- Visual flue check: Ensure the flue terminal is correctly fitted, not blocked, and that all flue joints are secure.
- Check flue sensor (qualified person): Locate the flue temperature sensor on the flue hood or outlet. Ensure it is firmly clipped and the cable is intact.
- Wiring inspection: Confirm the flue sensor connector is properly seated on the PCB.
- Configuration check: If the flue has been modified, an Alpha engineer must verify that the total length and number of bends are within specification and that any required flue restrictor rings are correctly fitted.
Persistent E18 requires professional flue and combustion analysis.
Advertisements
Repair Difficulty
Professional Required
5/5
Required Part
Flue Temperature Sensor
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements