Ferroli Domina 102 Fault codes & diagnostics

What to check first

1. Locate the external filling loop, which is usually a braided silver hose connecting two pipes under the boiler
2. Open the small valve or tap on the filling loop to allow cold mains water to enter the system
3. Watch the pressure gauge on the front of the boiler and close the valve once the needle reaches 1.5 bar
4. Check for any obvious puddles under radiators or the boiler that might explain the initial pressure loss

Parts commonly replaced

• Filling loop
• Pressure relief valve
• Pressure gauge

What to check first

1. Locate the external filling loop (a flexible silver hose connecting two pipes near the boiler).
2. Slowly open the tap or valve on the filling loop to allow water into the system.
3. 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.

Parts commonly replaced

• Filling loop
• Pressure relief valve
• Pressure gauge

What to check first

1. Locate the external filling loop, which is a silver braided hose connected between two valves underneath the boiler.
2. Open the valves slowly to allow mains cold water into the system while watching the pressure gauge.
3. Close the valves tightly once the needle reaches the green zone, typically between 1.0 and 1.5 bar.

Parts commonly replaced

• Filling loop
• Pressure relief valve
• Pressure gauge

Parts commonly replaced

• Overheat thermostat
• Gas valve
• Ignition electrode

Parts commonly replaced

• DHW NTC sensor