BoilerFaultCodesThe 6 most common faults
Your boiler has tried to start but failed to light the flame, leaving you without heating or hot water.
Why it happens: This fault occurs when the boiler's control system fails to detect a steady flame after several attempts to start. It is usually caused by a worn ignition spark that cannot light the gas, or a dirty sensor that fails to tell the boiler the flame is actually lit. In some cases, the gas valve may be stuck or electrical components have failed, preventing the combustion process from beginning.
Check if other gas appliances in your home, such as a hob, are working correctly.Ensure your gas meter has credit and the isolation valve is open.Press and hold the 'Reset' button for two seconds to see if the boiler restarts.
Your boiler is failing to light or stay lit, meaning it cannot safely generate heat and has locked itself out.
Why it happens: This fault occurs when the boiler's control system cannot detect a steady flame after trying to ignite several times. The most common reasons are a worn-out ignition spark, a dirty sensor that can't 'see' the flame, or an unstable gas supply preventing a smooth arrival of fuel. Without a confirmed flame, the boiler shuts down as a safety precaution to prevents unburnt gas from building up.
Check that your gas meter has credit (if on a prepay meter)Check that other gas appliances in the home are working correctlyPress the 'Reset' button on the boiler control panel for 2-3 seconds
Your boiler has shut down because it has detected that the water inside has become dangerously hot, causing the safety overheat thermostat to trip.
Why it happens: This fault occurs when the water leaving the boiler exceeds a safe temperature limit, causing the system to shut down to prevent damage. The most common reason is a lack of water circulation, often caused by a failed pump or a blockage in the heat exchanger that prevents heat from being carried away quickly enough.
Check that all radiator valves are fully openEnsure the central heating system pressure is between 1.0 and 1.5 barPress the 'Reset' button on the boiler control panel once the unit has cooled down
Your boiler has detected that water is the wrong temperature as it enters and leaves the unit, essentially indicating that the water is not circulating through your radiators properly.
Why it happens: This fault occurs when water is unable to move through the boiler fast enough to carry heat away, causing a dangerous temperature buildup. The most common reasons are a failed internal pump that has stopped spinning or a heavy buildup of sludge and debris that is physically blocking the pipework. It can also be caused by air trapped in the system or sensors that are sending incorrect readings to the control board.
Check that all radiator valves and boiler isolation valves are fully openEnsure your central heating pump is running and hasn't seizedBleed all radiators to remove trapped air that might be blocking water flow
Your boiler has shut down because it has detected an unsafe build-up of heat or a lack of water circulation within the main system.
Why it happens: This fault occurs when the water temperature inside the boiler exceeds a safe limit, causing the safety sensors to trigger a complete shutdown. The most common reasons are a failed pump that isn't moving water away from the heat exchanger quickly enough, or a blockage caused by a build-up of sludge and debris within the system. It can also be triggered if there is trapped air in the pipes or if the water pressure has dropped too low.
Check that your boiler pressure gauge is between 1.0 and 1.5 barEnsure all radiator valves and internal bypass valves are open to allow water flowPress the 'Reset' button on the control panel once the boiler has cooled down
Your boiler has shut down because the internal water temperature has risen too quickly, suggesting a blockage or a circulation problem.
Why it happens: This fault occurs when the water inside the boiler heats up much faster than the system can carry it away, causing it to reach a dangerous temperature in seconds. The most common reasons are a pump that has stopped working or a buildup of sludge and debris that is physically blocking the flow of water through the narrow channels of the heat exchanger.
Check that all radiator valves and boiler isolation valves are fully openEnsure your central heating system pressure is between 1.0 and 1.5 barPress the reset button to see if the fault clears once the unit has cooled down
on the Remeha Quinta 115
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