BoilerFaultCodesThe 6 most common faults
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 usually a braided silver hose connecting two pipes under the boilerOpen the small valve or tap on the filling loop to allow cold mains water to enter the systemWatch the pressure gauge on the front of the boiler and close the valve once the needle reaches 1.5 barCheck for any obvious puddles under radiators or the boiler that might explain the initial pressure loss
Your boiler has stopped heating because the water pressure inside the system has dropped too low to operate safely.
Locate the external filling loop, which is a silver braided hose connected between two valves underneath the boiler.Open the valves slowly to allow mains cold water into the system while watching the pressure gauge.Close the valves tightly once the needle reaches the green zone, typically between 1.0 and 1.5 bar.
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 (a flexible silver hose connecting two pipes near the boiler).Slowly open the tap or valve on the filling loop to allow water into the system.Watch the pressure gauge on the boiler until the needle reaches the green zone (usually 1.0 to 1.5 bar), then close the valve tightly.
Your boiler is struggling to detect the temperature of your hot water, which likely means you have no hot water working at your taps.
Full guide for Tap symbol light ONYour boiler has stopped working for safety reasons and is refusing to ignite, which means it currently cannot provide any heating or hot water.
Full guide for Red LED Out (Lockout)Your boiler is struggling to register that you have turned the heating on, causing it to stay idle or fail to start.
Full guide for Heating demand light ONon the Ferroli Domina 102
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