23 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Biasi Riva Plus
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Your boiler has detected an issue with a temperature sensor, which stops it from properly monitoring how hot the water is getting.
Your boiler has suffered an electrical safety fuse failure, which completely cuts power to the internal controls to prevent further damage.
Your boiler has stopped working because it cannot detect water flowing properly through the internal heating system.
Your boiler is not detecting the flow of water needed to provide hot water safely.
Your boiler has detected an issue related to the domestic hot water heat exchanger, which may cause your hot water to stop working properly.
Your boiler has detected an issue related to the hot water heat exchanger, which may prevent your hot water from working properly.
Your boiler's safety pressure valve has opened or registered a fault because the internal water pressure has become too high.
Your boiler is not properly detecting when you turn on the hot tap, so it fails to fire up and provide hot water.
Your boiler is having trouble directing heat properly between your radiators and your taps, which usually means it is stuck providing only hot water or only heating.
Your boiler has automatically shut down because the internal safety thermostat detected that the water temperature has risen dangerously high.
Your boiler is detecting an issue with the internal expansion vessel, which regulates system pressure and protects your heating pipes from bursting.
Your boiler is struggling to reliably detect the burner flame, which usually results in the system locking out for safety.
Your boiler is failing to detect a proper flame when trying to light, causing it to lock out and stop providing heating and hot water.
Your boiler is failing to light the burner because of a fault with the ignition components, meaning you currently have no heating or hot water.
Your boiler has detected an issue with the internal gas valve, which controls the fuel supply required for heating and hot water.
Your boiler has failed to ignite properly and has locked out for safety reasons.
Your boiler is detecting an issue with the combined temperature and pressure gauge or its wiring, meaning it cannot accurately read the system status.
Your boiler has detected an internal fault related to the insulation panels inside the combustion chamber, which requires a Gas Safe registered engineer to inspect and ensure safe operation.
Your boiler has detected an issue involving the internal combustion chamber insulation or rear panel, which is critical for safe and efficient fuel burning.
Your boiler has registered an internal configuration or sensor error related to the combustion chamber components, which requires professional inspection.
Your boiler has detected an issue with the seal or placement of the combustion chamber front panel, which is a critical safety component that keeps the burner gases contained.
Your boiler has detected an internal configuration mismatch or safety seal issue involving the main casing panel, which requires professional inspection to ensure it is burning safely.
Your boiler has temporarily shut down because the water inside it has become dangerously hot, which usually points to a blockage in the flow.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes