BoilerFaultCodes
The most common Remeha faults
Your boiler has switched itself off because an external safety device, such as a thermostat or pressure switch, has detected an issue and broken the electrical circuit.
Why it happens: This fault occurs when an external safety component connected to the boiler’s control board detects a potential hazard and breaks the electrical circuit to stop operation. The most common reason is an underfloor heating safety thermostat triggering because the water is too hot, or a gas pressure switch detecting that the incoming fuel supply is unstable.
Check if your room thermostat or programmer is set too low or has run out of batteriesIf you have underfloor heating, check if the floor has overheated and tripped the safety limitReset the boiler by pressing the reset button for two seconds
Your boiler is struggling to ignite or keep the flame burning, and it is now trying to clear itself out before attempting to start again.
Why it happens: This fault occurs when the boiler's control system cannot detect a steady flame after it tries to light. The most common reasons are a worn-out ignition spark, a blocked airway, or a faulty gas valve that isn't letting enough fuel into the burner.
Check if other gas appliances, like a hob, are working to ensure there is a gas supply.If you have a prepaid meter, check that you have enough credit.Press the Reset button once to see if the boiler restarts.
Your boiler has detected that the water inside is getting too hot too quickly, usually because there isn't enough water pressure or the water isn't moving through the pipes properly.
Why it happens: This fault occurs when the heat inside the boiler cannot be carried away by the water quickly enough, causing the system to protect itself from damage. The most common reasons are a lack of water pressure, a blockage in the pipework, or a pump that has failed and stopped moving the water around. It can also happen if too much air is trapped in the boiler, creating an air pocket that stops the flow.
Check the pressure gauge on the front of the boiler; if it is below 1.0, top it up using the filling loop.Ensure all radiator valves are fully open to allow water to circulate.Bleed your radiators to remove any trapped air that might be blocking the flow.
Your boiler has detected that water is not circulating correctly, often because there is trapped air or the system pressure is too low.
Why it happens: This fault occurs when the boiler's internal sensors detect that the temperatures are the wrong way around or not changing as expected, suggesting water isn't moving through the unit. The most common reasons are a lack of water pressure, a buildup of trapped air pockets, or a pump that has seized and can no longer push water around your radiators. Essentially, the boiler is shutting down to prevent itself from overheating because the heat it produces has nowhere to go.
Check the pressure gauge and top up to 1.5 bar if it is lowBleed all radiators to remove trapped airEnsure all radiator valves and isolation valves are fully openReset the boiler using the reset button
Your boiler has tried to light itself several times but has failed, likely because there is no gas supply or the ignition part is dirty or broken.
Why it happens: This fault occurs when the boiler is unable to detect a flame after several attempts to start up. The most common reason is a lack of gas reaching the burner, often caused by a closed valve, an issue with the gas meter, or a buildup of carbon on the part that creates the spark.
Check if other gas appliances in your home, like a hob, are working to ensure gas is reaching the property.If you have a prepayment meter, check that you have remaining credit and the valve is open.Press the Reset button on the boiler control panel for one to two seconds.
Your boiler has detected that there is not enough water inside the system to operate safely, or the internal pump is struggling to move the water around.
Why it happens: This fault occurs when the internal sensors detect that water isn't moving through the heat exchanger as it should, leading to a risk of overheating. The most common reasons are a pump that has seized or failed, a loss of system pressure, or a physical blockage like an air lock preventing flow.
Check your system pressure gauge; if it is below 1 bar, top up the water using your boiler's filling loop until it reads between 1 and 1.5 bar.Ensure all radiator valves and your isolation valves underneath the boiler are fully open.Turn the boiler off at the fused spur for 30 seconds, then switch it back on to reset the fault.
Your boiler is struggling to ignite or detect a flame, causing the system to stop as a safety precaution.
Why it happens: This fault occurs when the boiler tries to light but fails to establish or sense a stable flame within the set time limit. The most common reasons include a lack of gas reaching the burner, worn-out ignition components that can no longer create a spark, or a dirty sensor that cannot tell the boiler the flame is safely lit.
Check that your gas meter is turned on and other gas appliances like the hob are working.If you have a prepaid gas meter, verify that you have sufficient credit.Press and hold the 'Reset' button for two seconds and wait up to three minutes for the venting cycle to complete.
Your boiler has switched itself off because the water temperature is rising too quickly, usually due to poor water flow through the system.
Why it happens: This fault occurs when water cannot move through the boiler fast enough to carry heat away, causing a rapid temperature spike. The most common reasons are a failing water pump, a blockage caused by sludge in the pipework, or air trapped within the heat exchanger.
Check that all radiator valves are fully openEnsure the central heating pump is running and hasn't seizedCheck that any external bypass valves are open
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