BoilerFaultCodesThe 6 most common faults
Your boiler has lost its flame while running and has shut down as a safety precaution.
Check if other gas appliances (like a hob) are working to ensure gas is reaching the propertyCheck that your gas meter has credit if you have a prepayment meterPress and hold the reset button for several seconds to restart the boiler
Your boiler has failed to light the gas, meaning it cannot heat your water or radiators.
Check if your gas supply is active by testing another gas appliance like a hob.Check your gas meter to ensure it has credit or the valve is turned on.Press and hold the 'R' reset button for 2 seconds to see if the boiler restarts.
Your boiler has shut down because it has detected it is getting too hot, which is usually due to a lack of water flow through the system.
Check that your radiator valves are open to ensure water can move freely.Check the boiler pressure gauge and top it up to 1.5 bar if it is low.Attempt to reset the boiler by turning the selector knob to the 'R' position for 5 seconds.Bleed your radiators to remove any trapped air that might be causing a blockage.
Your boiler has been manually reset too many times in a short period and has now locked itself out for safety.
Turn the power supply to the boiler off at the fused spur switchWait for 30 secondsTurn the power back on to clear the reset limit
Your boiler has detected that the water pressure is too low for it to operate safely and effectively.
Locate the filling loop (usually a silver braided hose underneath the boiler).Slowly open the valve(s) until you hear water entering the system.Monitor the pressure gauge until it reaches between 1.0 and 1.5 bar, then close the valves tightly.
One of the buttons on your boiler's control panel has become jammed or is being continuously pressed, which is preventing the system from operating correctly.
Identify which button on the front panel feels stuck or stiff.Gently press and wiggle the affected button to see if it pops back out.Clean the area around the buttons with a dry, soft cloth to remove any sticky residue or dust.Reset the boiler using the selector switch.
on the Alpha E-Tec Plus 10 / 18
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
Avoid the next call-out bill
Monthly cover means no unexpected bills when your boiler breaks down.
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