BoilerFaultCodesThe 6 most common faults
Your boiler has detected that the water pressure level is too low to safely operate, so it has shut itself down to prevent damage.
Locate the external filling loop, which is usually a flexible silver hose connected under the boiler.Gradually open the valves on the filling loop until you hear water entering the system.Monitor the pressure gauge on the front of the boiler until the needle reaches the green zone, typically between 1.0 and 1.5 bar, then tightly close both valves.
Your boiler has detected that a button on the control panel is being held down or is stuck, which is preventing it from operating correctly.
Turn the boiler power off at the fused spur or mains switch.Inspect the buttons on the front control panel to ensure none are physically stuck, depressed, or obstructed by debris.Gently press each button a few times to see if they click freely, then turn the boiler power back on to see if the fault clears.
Your boiler has lost communication with its smart thermostat, meaning it cannot receive instructions to turn on your heating or hot water.
Check that your Alpha Climatic thermostat has fresh batteries, as a drained battery will disconnect the signal.Switch the boiler off at the fused spur or mains power for 60 seconds, then switch it back on to force a system reconnection.Ensure the thermostat is within range of the boiler and that there are no new physical obstructions blocking the wireless signal.
Your boiler has lost its wireless connection to your room thermostat, meaning it doesn't know when to turn your heating on or off.
Check the batteries in your room thermostat and replace them if they are old or low.Power cycle the boiler by switching it off at the fused spur for 60 seconds and then turning it back on.Perform the re-pairing procedure for your specific thermostat model as detailed in your installation manual.
Your boiler is struggling to pump water around your radiators because there is likely air trapped inside the system or a blockage in the pipes.
Check that all your radiator valves are fully openBleed your radiators using a radiator key to release any trapped airCheck your boiler pressure gauge and top up to 1.5 bar if necessary
Your boiler has detected that the exhaust gases leaving the flue are getting too hot, so it has shut down to prevent any damage.
Full guide for E03on the Alpha Evoke
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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