BoilerFaultCodesThe 6 most common faults
Your boiler has effectively switched itself off because it has detected that it is getting too hot inside.
Check that all radiator valves (TRVs) are fully open to allow water to circulateEnsure the boiler pressure is between 1.0 and 1.5 bar on the gaugePress the Reset button for two seconds once the system has cooled down
Your boiler has detected that the water pressure in the central heating system is too low for it to operate safely.
Locate the silver braided filling loop hoses underneath or near the boilerSlowly open both black lever valves to allow water into the systemClose both valves once the pressure gauge on the boiler screen reads between 1.0 and 1.5 barPress the 'Reset' button on the control panel to clear the code
Your boiler has switched itself off because it has detected that the internal water temperature has become dangerously hot.
Check that all radiator valves are fully openEnsure the boiler pressure is between 1 and 2 barPress the 'Reset' button on the control panelCheck if the pump is making unusual noises or is stuck
Your boiler is struggling to keep a flame lit, causing it to shut down for safety after five unsuccessful attempts to restart.
Check that your gas emergency control valve is open and you have credit on your gas meterCheck if other gas appliances in your home, such as a hob, are working correctlyPress the 'Reset' button for two seconds to see if the boiler restarts
Your boiler is struggling to circulate water properly because there is either not enough water in the system or a blockage is preventing it from flowing through the pipes.
Check the pressure gauge on the front of the boiler; if it is below 1.0 bar, use the filling loop to top it up to 1.5 bar.Ensure all radiator valves and the boiler isolation valves are fully open.Bleed your radiators to remove any trapped air that might be blocking water flow.
Your boiler has reached an unsafely high internal temperature, likely because there is not enough water flowing through the system to carry the heat away.
Check the boiler pressure gauge and top it up to 1.5 bar using the filling loop if it is too low.Ensure all radiator valves are fully open and not turned off.Bleed all radiators to remove trapped air which may be blocking water flow.Reset the boiler by pressing the reset button for two seconds.
on the Remeha Avanta Plus 28c
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 Remeha 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