22 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Riva Plus
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Your boiler has lost all power and is completely unresponsive to any requests for heating or hot water, suggesting a total electrical failure.
Your boiler is failing to light the burner because it cannot detect a flame, meaning your heating and hot water will not work.
Your boiler is failing to detect that water is circulating properly, which prevents it from firing safely.
Your boiler is struggling to detect the flow of water needed to provide hot water or heating because an internal sensor is failing to recognise that the system is active.
Your boiler is not detecting that the hot water is flowing correctly, so it has shut down to prevent the system from getting too hot.
Your boiler is struggling to detect the temperature of the water used for your taps and shower, which is preventing it from heating your hot water properly.
Your boiler has detected an issue with the safety valve that monitors pressure, likely requiring a professional to check for leaks or internal component failure.
Your boiler is failing to detect that you have turned on a hot tap, so it is refusing to heat your water.
Your boiler is struggling to direct heat between your radiators and your hot water taps because a mechanical switch inside the unit has failed.
Your boiler has detected that it is getting dangerously hot and has shut itself down to prevent damage or fire risk.
Your boiler is struggling to manage the water pressure inside the system because an internal component responsible for absorbing pressure changes has failed.
Your boiler is failing to detect a flame during ignition, meaning it cannot safely start to heat your water or home.
Your boiler is failing to light the flame safely because it cannot detect the ignition spark, meaning you currently have no heating or hot water.
Your boiler is failing to light the burner because it cannot detect the necessary spark, meaning you will currently have no heating or hot water.
Your boiler is failing to detect or control the gas flow properly, which means it has safely shut itself down to prevent ignition issues.
Your boiler has failed to ignite the gas burner after several attempts, so it has safely shut down to prevent a build-up of unburnt gas.
Your boiler has detected an issue with the internal insulation or protective panels lining the area where the flame burns, which is a safety mechanism to prevent overheating of the outer casing.
Your boiler has detected a physical problem with the internal insulation or heat shield inside the combustion chamber, which requires a professional inspection to ensure the unit is running safely.
Your boiler has detected an issue with the internal insulation panel inside the main combustion area that needs professional attention.
Your boiler has detected a potential issue with the seal of the combustion chamber, which is a safety mechanism to prevent exhaust gases from leaking into your home.
Your boiler has detected an issue with the seal or security of the front cover protecting the internal combustion area, which is a vital safety feature to prevent fumes from escaping.
Your boiler is failing to light the flame despite several attempts, meaning it has safely shut itself down to prevent a gas buildup.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes