13 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: ProCombi Exclusive 2
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 |
|---|---|---|
| 47-348-79 | Procombi Exclusive 24 | 2011–present |
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Your boiler has lost its identity because a small memory chip is missing or not communicating with the internal computer.
Your boiler's internal computer chip has lost communication with the main control board, preventing the unit from starting up.
Your boiler has lost communication with its internal memory chip, meaning it cannot process the settings required to operate.
Your boiler has identified a specific internal fault and is flashing to let you know it needs attention to identify the exact problem.
Your boiler has detected that there is not enough water in the system to operate safely, which is usually caused by a small leak or air being bled from a radiator.
Your boiler has stopped working because the internal fan, which safely clears waste gases away, is not running correctly.
Your boiler has detected a problem with the internal sensor that monitors the temperature of the water leaving the unit, causing it to stop for safety.
Your boiler has failed to light the gas flame and has shut itself down for safety.
Your boiler has stopped working to protect itself and is waiting for you to check a secondary code to find the specific problem.
Your boiler has failed to ignite after several attempts, meaning it has shut itself down for safety and currently cannot provide heating or hot water.
Your boiler has switched itself off because the water inside it has become too hot, likely due to a circulation problem.
Your boiler has tried to light several times but has failed to stay on, meaning your heating and hot water will not work until it is reset or repaired.
Your boiler has detected an issue with the sensor that monitors the temperature of the water returning to the unit, causing it to stop for safety.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes