BoilerFaultCodesThe 6 most common faults
Your boiler has stopped working because the water pressure inside your heating system has dropped too low.
Locate the external filling loop, usually a small silver braided hose with one or two valves located underneath the boiler.Slowly open the valve(s) to allow mains water into the system while watching the pressure gauge on the front of the boiler.Close the valve(s) firmly once the needle sits between 1.0 and 1.5 bar on the gauge and check the fault code has cleared.
Your boiler is struggling to talk to your wireless thermostat, which means it doesn't know when to turn your heating on or off.
Check if the batteries in your wireless room thermostat are dead and replace them with high-quality alkaline batteries.Turn the power to the boiler off at the fused spur for one minute, then turn it back on to reset the connection.Ensure there are no new large electronic devices or metal obstructions placed between the thermostat and the boiler receiver.
Your boiler has detected that the burner has gone out or failed to ignite, so it has safely shut itself down to prevent gas from building up.
Full guide for E38Your boiler's computer needs to reset and recalibrate its internal heating settings to function correctly again.
Full guide for E72Your boiler is failing to light the burner, which means it cannot produce any heat or hot water.
Full guide for 01Your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage.
Full guide for 02on the Alpha Intec2 30SE
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 Alpha 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