13 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Flexicom hy
The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →
The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.
| GC number | Appliance (register name) | Produced |
|---|---|---|
| 41-047-22 | Micron100FF | 1999–2002 |
| 41-047-23 | Micron 120FF | 1999–present |
Tap any card for details
Your boiler has stopped working because a protective electrical fuse has blown, causing the system to shut down for safety.
Your boiler has stopped working because an internal safety fuse has blown, cutting off the power to the main control system.
Your boiler has lost its electrical power supply, meaning it cannot switch on to provide heating or hot water.
Your boiler is not receiving power, which means it cannot turn on to provide heating or hot water.
Your boiler has stopped working because it has either lost water pressure or triggered a safety shut-off to prevent it from getting too hot.
Your boiler has detected that the water pressure level inside the system is too low to operate safely, causing it to shut down to prevent damage.
Your boiler has stopped running because it has either detected that it is getting too hot or the water pressure in the system has dropped too low.
Your boiler is failing to clear combustion gases properly, so it has safely shut itself down to prevent carbon monoxide buildup.
Your boiler has detected an issue with its internal airflow system meant to clear exhaust gases, preventing it from safely starting up.
Your boiler has stopped working because it cannot confirm that the internal fan is safely clearing waste gases out of the flue.
Your boiler is failing to light the burner, meaning it cannot produce heat or hot water because it does not detect a flame.
Your boiler is failing to light because it cannot create the necessary spark to start the pilot flame.
Your boiler is trying to start up but cannot light the small pilot flame needed to ignite the main heating system.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes