BoilerFaultCodesThe 6 most common faults
Your boiler has detected that the water pressure inside the system has dropped too low to operate safely.
Locate the external filling loop, which is usually a small metal braided hose with one or two valves located underneath the boiler.Gradually open the valve(s) to let water into the system while watching the pressure gauge on the front panel.Stop opening the valve once the needle reaches the green zone, typically between 1.0 and 1.5 bar, then ensure the valve is fully closed.
Your boiler has detected that there is not enough water circulating inside the system to safely turn on the burner.
Check your boiler pressure gauge to see if it is below 1.0 bar.Locate the external filling loop connected to your boiler pipes.Open the filling valves to allow water into the system until the gauge reaches 1.5 bar, then securely close the valves.
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
Locate the filling loop, which is usually a silver flexible hose or two taps under the boiler.Slowly open the valves to allow mains cold water into the system while watching the pressure gauge.Stop filling when the needle on the gauge reaches the green zone, typically between 1.0 and 1.5 bar.
Your boiler has lost the ability to accurately measure the temperature of the water flowing through the system, so it has shut down as a precaution to prevent overheating.
Full guide for F.00Your boiler has stopped working because a sensor that measures the water temperature is faulty or has a loose connection.
Full guide for F.10Your boiler has detected an electrical fault with the sensor that monitors the temperature of the water returning to the system for reheating.
Full guide for F.11on the Glow-worm Energy7 Combi
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 Glow-worm 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
Avoid the next call-out bill
Monthly cover means no unexpected bills when your boiler breaks down.
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