BoilerFaultCodesThe 6 most common faults
01
ER 10 High DIY-safe
Your boiler has stopped working because it does not have enough water inside the system to operate safely.
What to try first
Locate the filling loop (a silver flexi-hose) underneath the boiler.Open the valves on the filling loop to allow cold mains water into the system.Watch the pressure gauge on the front of the boiler until the needle reaches the green zone (usually 1.5 bar).Close the valves tightly and ensure the boiler resets.
02
ER 1 High Engineer
Your boiler is trying to start but cannot light the internal flame, which means it has safely shut down to prevent gas from building up.
Full guide for ER 103
ER 2 High Engineer
Your boiler is failing to light the flame needed to produce heat or hot water.
Full guide for ER 204
ER 3 High Engineer
Your boiler has stopped because the internal flame went out unexpectedly while it was trying to heat your water or home.
Full guide for ER 305
ER 6 High Engineer
Your boiler has detected that the water inside the system has become dangerously hot and has shut itself down to prevent damage or overheating.
Full guide for ER 606
ER 7 High Engineer
Your boiler has lost the ability to measure the temperature of the water being sent to your radiators, so it has shut down to prevent overheating.
Full guide for ER 7on the Ferroli Xignal
Pressure TransducerExpansion VesselPressure Relief ValveIgnition electrodeGas valvePCB
Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.
Call a Gas Safe engineer if…
- You can smell gas or see signs of a leak
- The Ferroli shows an Emergency or High severity code
- The boiler keeps locking out after repeated resets
- You've tried the DIY checks and the fault hasn't cleared
- There's visible water leaking from the boiler
- The flame is yellow or orange instead of blue