BoilerFaultCodesMyson System 50 Fault codes & diagnostics
0 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
System Natural Gas 14.6 kW Discontinued
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The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →
Status & diagnostic codes 6 operating states & engineer diagnostics
Not faults — these are normal operating states. Tap to expand.
6 operating states & engineer diagnostics
Not faults — these are normal operating states. Tap to expand.
LED 1 Status Your boiler is currently checking that there is enough airflow for it to start up safely; this light should turn off automatically once the system is ready to fire. LED 2 Status Your boiler is struggling to clear air through its internal system effectively enough to safely ignite the burner. LED 3 Status Your boiler is signalling that it is asking the internal air extraction motor to speed up to prepare for ignition. LED 4 Status Your boiler is correctly telling you that it has received a signal from your thermostat and is currently turning on the pump to circulate hot water to your radiators. LED 5 Status Your boiler is correctly indicating that it has received a request to start the pump for your hot water. LED 6 Status Your boiler is currently going through its normal startup process to ignite the burner and get your heating or hot water working.