BoilerFaultCodesThe 6 most common faults
Your boiler has detected that the exhaust gases are getting too hot, causing it to shut down for safety.
Why it happens: This fault occurs when the boiler's internal components become too hot because heat isn't being transferred away from the burner efficiently. The most common reason is a buildup of limescale or sludge inside the main heat exchanger, which acts like a barrier and causes the metal to overheat. It can also be triggered if the sensor responsible for monitoring these temperatures has failed and is sending incorrect readings to the control board.
Full guide for DOMIcondens HE 26 CYour boiler has detected that the water pressure inside the system is too low, so it has temporarily turned itself off to prevent any damage.
Locate the filling loop (a silver flexi-hose with one or two valves) underneath your boiler.Open the valve(s) slowly to let water into the system until the pressure gauge on the front of the boiler reads between 1.0 and 1.5 bar.Ensure both valves are fully closed again to stop the water flow.
Your boiler has stopped working because the water pressure inside your heating system has dropped too low.
Locate the external filling loop, which is usually a silver braided hose connected between two valves under the boiler.Open the valves slowly to allow water to enter the system until the pressure gauge on the front of the boiler reads between 1 and 1.5 bar.Close both valves tightly and check the display to ensure the error code has cleared.
Your boiler has stopped working because the water pressure inside the heating system has dropped too low.
Locate the filling loop (a silver flexible hose with one or two valves) underneath the boiler.Open the valve(s) slowly to allow cold mains water into the system while watching the pressure gauge.Close the valve(s) tightly once the needle reaches 1.5 bar, then turn the boiler off and on again to clear the fault.
Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.
Locate the external filling loop, which is a silver braided hose connecting two pipes near the boiler.Open the small valves at both ends of the hose to allow mains water to enter the system.Watch the pressure gauge on the front of the boiler until the needle reaches the green zone (between 1 and 1.5 bar), then close both valves tightly.
Your boiler has stopped working because it has failed to light the burner, meaning you currently have no heating or hot water.
Full guide for F01on the Ferroli Domi Compact
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