E2
Remeha
Flow temperature sensor (NTC) fault
Boiler displays E2 and does not fire
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
Open-circuit flow NTC sensor, Short-circuited flow NTC sensor, Damaged NTC wiring harness, Fault on main PCB sensor input
How to Fix / Troubleshooting
Safety first: Isolate power before accessing internal components.
- Reset the boiler: Perform a reset as per the user instructions. If E2 reappears, continue.
- Check system temperature: Ensure the boiler is not genuinely overheated (very hot flow pipe). If it is, allow to cool and investigate circulation issues.
- Visual inspection of sensor wiring: With the case removed by a competent person, locate the flow NTC on the flow pipe leaving the heat exchanger. Check for loose plug connections, damaged insulation, or corrosion on terminals.
- Engineer tasks: A technician should measure the resistance of the flow NTC at known temperatures and compare with Remeha specifications, check continuity of the harness back to the PCB, and replace the NTC sensor if out of range.
Advertisements
Repair Difficulty
Hard
4/5
Required Part
Flow Temperature Sensor (NTC)
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements