BoilerFaultCodesThe 6 most common faults
Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.
Locate the external filling loop, which is a silver braided flexible hose connected to two valves under the boiler.Open the valves slowly to allow mains water into the system until the pressure gauge on the front reads between 1.0 and 1.5 bar.Close both valves tightly to stop the flow and ensure the boiler resets itself.
Your boiler has lost its connection to the digital controller or thermostat, meaning it cannot receive instructions to start your heating or hot water.
Check that your wall-mounted thermostat or remote control has fresh batteries.Ensure the thermostat or receiver unit is switched on at the wall isolator or fused spur.Restart the boiler by turning it off at the mains for 60 seconds and then turning it back on to force the units to re-pair.
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.
on 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