BoilerFaultCodes
The most common Remeha faults
Your boiler has lost its electrical power supply and cannot turn on or heat your home.
Why it happens: This fault occurs when the boiler's internal computer system is no longer receiving the electricity it needs to operate. The most common reason is a blown fuse on the main circuit board or a failure of the external power switch supplying the unit. In some cases, an internal electrical short or a faulty control board is preventing the power from flowng through the system.
Check if other appliances in your home have power.Verify that the boiler's fused spur switch is turned on.Check your home's main consumer unit (fuse box) to see if a circuit breaker has tripped.
Your boiler is failing to light or keep a flame going, which means your heating and hot water have stopped working.
Why it happens: This fault occurs when the boiler's control system attempts to start the burner but fails to detect a stable flame. The most common reasons are worn-out ignition components that can't create a spark or a faulty sensor that cannot 'see' the flame even if it is actually lit.
Check if other gas appliances in your home, like a hob, are working to ensure gas supply is active.Check that your prepaid gas meter has credit, if applicable.Press the reset button on the control panel to see if the boiler restarts.
Your boiler has detected that there is not enough water pressure in the system to operate safely, causing it to shut down.
Why it happens: This fault occurs when the internal sensors detect that the system's water pressure has dropped below the minimum level required for safe operation. The most common reason is a slow leak somewhere in your radiators or pipework, though it can also happen if you have recently bled your radiators without topping the pressure back up.
Check the pressure gauge on the boiler or pipeworkLocate the external filling loop (braided silver hose)Slowly open the valves to top up the water until the pressure is between 1.0 and 1.5 barEnsure valves are closed tightly and reset the boiler
Your boiler has lost water pressure or cannot detect enough water to operate safely, causing it to shut down to prevent damage.
Why it happens: This fault occurs when the system's internal sensors detect that the water pressure has dropped too low for the boiler to operate safely. The most common reasons are a leak somewhere in the pipework or radiators, or an expansion vessel that has lost its air charge and can no longer stabilize the pressure. In some cases, the water pressure sensor itself may have failed or become blocked with system debris.
Check the pressure gauge on the boiler or pipeworkUse the external filling loop to top up the system pressure to 1.5 barEnsure all radiator valves and system isolation valves are fully openRestart the boiler once the correct pressure is reached
Your boiler has tried to start up but cannot light the gas to create a flame.
Why it happens: This fault occurs when the boiler's control system attempts to start the combustion process but fails to detect a flame after several attempts. It is usually caused by a lack of gas supply, a worn-out ignition spark electrode that can no longer create a spark, or a faulty gas valve that isn't opening correctly.
Check that your gas supply is turned on at the meter.If you have a prepaid gas meter, check that you have remaining credit.Press the Reset button for two seconds to see if the boiler restarts.
Your boiler has shut down because it has detected an internal temperature that is too high, often caused by a blockage or a pump failure.
Why it happens: This fault occurs when the water inside the boiler gets too hot, causing the safety sensor to trip and shut the system down to prevent damage. The most common reasons are a broken circulation pump that isn't moving the water away from the burner quickly enough, or a build-up of sludge and debris creating a blockage in the heat exchanger.
Check that your radiator valves are open and not turned to zero.Verify that the boiler pressure is between 1 and 2 bar.Press the 'Reset' button on the control panel to see if the fault clears.
Your boiler is failing to light the gas burner properly and has locked itself out for safety after several unsuccessful tries.
Why it happens: This fault occurs when the boiler tries to light the gas burner five times but fails to detect a stable flame. The most common reasons are a build-up of carbon on the ignition probes, a lack of gas supply to the unit, or a internal electrical component failing to generate the necessary spark.
Check if other gas appliances like your hob are working to ensure gas is reaching the propertyEnsure your gas pre-pay meter, if you have one, has creditPress the 'Reset' button on the boiler control panel for two seconds
Your boiler was working but the flame has unexpectedly gone out, meaning the system has stopped providing heat for your safety.
Why it happens: This fault occurs when your boiler successfully starts but then loses its flame while it is running. The most common reasons are a build-up of carbon on the sensing probe or a blockage in the drainage system that causes water to back up into the burner. In some cases, the gas valve may be failing to maintain a steady flow of fuel to keep the flame lit.
Check if other gas appliances in your home, like a gas hob, are working to ensure gas supply is active.Verify that your prepaid gas meter (if applicable) has sufficient credit.Press the 'Reset' button on the boiler control panel for two seconds.