BoilerFaultCodesSime Dewy 30/130 HE FS Fault codes & diagnostics
0 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Combi Natural Gas 2004-2014 Discontinued
GC Number 47-283-05
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Status & diagnostic codes 31 operating states & engineer diagnostics
Not faults — these are normal operating states. Tap to expand.
31 operating states & engineer diagnostics
Not faults — these are normal operating states. Tap to expand.
30 Diagnostic Your boiler's internal pressure-balancing component is faulty, which is likely causing your system pressure to fluctuate and preventing the boiler from firing safely. 51 Diagnostic Your boiler has detected that the water inside the system is getting too cold and has activated its built-in safety mode to prevent the pipes from freezing. 52 Diagnostic Your boiler is confused about whether it should be providing heating or just hot water because the internal sensor is detecting conflicting temperature signals. 53 Diagnostic Your boiler is displaying a configuration message indicating how it communicates with your room thermostat, rather than a mechanical breakdown. 54 Diagnostic Your boiler is struggling to accurately read the room or outside temperature, which may cause it to turn the heating on or off at the wrong times. 55 Diagnostic Your boiler has detected that the water inside the system has become dangerously hot and has shut itself down to prevent damage or overheating. 56 Diagnostic Your boiler is struggling to control its internal temperature because it is detecting a sudden or abnormal change in how fast it is heating up. 57 Diagnostic Your boiler is currently recalibrating its internal settings to ensure it runs as efficiently as possible. 58 Diagnostic Your boiler is currently performing a routine internal system check or self-optimisation and is not experiencing a fault. 59 Diagnostic Your boiler has detected that the water temperature is rising or falling too quickly, causing it to shut down to protect itself from potential damage. 60 Diagnostic Your boiler is currently in a configuration mode that prevents it from heating, rather than suffering from a hardware failure. 61 Diagnostic Your boiler is struggling to reach the desired hot water temperature and is limiting its output to protect itself. 62 Diagnostic Your boiler is struggling to detect or heat the water for your taps and showers, which has caused it to stop working to prevent internal damage. 63 Diagnostic Your boiler's internal computer settings have been locked, which prevents it from operating correctly until the control system is reset by a professional. 64 Diagnostic Your boiler is detecting an issue with an external control or sensor connection, preventing it from operating correctly. 65 Diagnostic Your boiler is receiving a signal from an external device, such as a smart thermostat or weather sensor, that is preventing it from firing up as normal. 66 Diagnostic Your boiler is struggling to read the temperature from the outside sensor, which is causing it to adjust your heating settings incorrectly. 69 Diagnostic Your boiler is currently running a brief, automatic heating cycle designed to kill bacteria in your hot water storage tank. 80 Diagnostic Your boiler is not firing because it has failed to ignite the flame during the start-up sequence. 85 Diagnostic Your boiler has detected an issue with the heat exchanger or water flow circulation, preventing it from operating correctly. 90 Diagnostic Your boiler is failing to ignite because there is a fault with the electrical transformer that generates the spark needed to start the burner. 95 Diagnostic Your boiler has detected a problem with the internal fan or the way it exhausts gases, causing the system to stop working as a safety precaution. 100 Diagnostic Your boiler has detected that the water pressure in your heating system is too low to operate safely. 105 Diagnostic Your boiler is struggling because there is not enough water circulating inside the system or air is trapped in the pipes, preventing the water from flowing properly. 120 Diagnostic Your boiler is failing to ignite because it cannot detect a flame, meaning you currently have no heating or hot water. 125 Diagnostic Your boiler has detected that the water is heating up far too quickly or that the flow of water is insufficient, causing the system to shut down to prevent damage. 130 Diagnostic Your boiler has detected that the front panel of the sealed combustion chamber is not properly secured, which is a safety feature to prevent fumes from escaping into your home. 140 Diagnostic Your boiler is struggling to switch between heating your radiators and providing hot water to your taps because a internal valve is jammed or faulty. 160 Diagnostic Your boiler has detected an issue with the fan's operation, which prevents it from safely venting gases. 175 Diagnostic Your boiler's internal digital clock settings are currently corrupted or have been reset, preventing the unit from following your programmed heating schedule. 180 Diagnostic Your boiler has detected an issue with the safety temperature monitoring system and has automatically shut down to prevent overheating.