BoilerFaultCodesThe 6 most common faults
Your boiler has detected that the water pressure in the system is too low for it to operate safely.
Locate the filling loop (a flexible silver hose) underneath or near the boiler.Slowly open the valves on the filling loop until you hear water moving.Watch the pressure gauge and close the valves once it reaches between 1.0 and 1.5 bar.
Your boiler is failing to light the gas even though it is trying to start up.
Check that your gas emergency control valve (usually by the meter) is in the 'on' positionCheck if other gas appliances in your home, like a hob, are working correctlyRestart the boiler using the reset button to see if it was a temporary glitch
Your boiler is struggling to keep its flame lit, which is usually caused by a blockage in the drainage pipe or an incorrect gas supply.
Check the external white plastic condensate pipe for signs of freezing or blockages.If the pipe is frozen, gently pour warm (not boiling) water over it to thaw the ice.Restart the boiler using the reset button to see if the flame stays lit.
Your system has detected a potential electronic reading error during its routine startup check and has stopped working to prevent further issues.
Full guide for 0Your hybrid system has detected that the water temperature inside the unit is getting too hot, so it has temporarily shut down to prevent damage.
Full guide for 1The system's control sensors have been incorrectly wired or swapped during installation or maintenance, preventing the boiler from correctly reading temperatures.
Full guide for 2on the Daikin Altherma Hybrid EHYKOMB33
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 Daikin 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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