BoilerFaultCodesServowarm Elite HE Fault codes & diagnostics
0 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Combi Natural Gas 24-30 kW 1995 onwards Discontinued
GC Number 47-555-04
Download the Servowarm Elite HE manual
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Versions & GC numbers
The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →
Which version do you have?
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 |
|---|---|---|
| 47-555-04 | Elite HE Combi | 1995–present |
Appliance names and production years are taken from the UK Product Characteristics Database (the SAP/SEDBUK register). Where a GC number is also printed in this model's own manufacturer manual, both sources were checked to agree.
Status & diagnostic codes 10 operating states & engineer diagnostics
Not faults — these are normal operating states. Tap to expand.
10 operating states & engineer diagnostics
Not faults — these are normal operating states. Tap to expand.
10 Diagnostic Your boiler is struggling to accurately measure its own temperature, likely due to a faulty sensor or a loose wire that is causing it to stop operating to stay safe. 20 Diagnostic Your boiler is struggling to read the temperature correctly because a sensor is sending an invalid signal, causing the system to stop heating for safety reasons. 30 Diagnostic Your boiler has detected an issue with a temperature sensor, which is preventing it from safely heating your home. 40 Diagnostic Your boiler has detected a faulty temperature reading from a sensor, which is preventing it from heating your home safely. 50 Diagnostic Your boiler has detected an issue with a sensor reading, which has caused it to stop working to ensure it remains safe. 60 Diagnostic Your boiler has detected an incorrect reading from a temperature sensor, causing it to shut down to prevent potential overheating. 70 Diagnostic Your boiler is struggling to accurately read its own water temperature, which has caused it to stop working to prevent potential overheating. 80 Diagnostic Your boiler is struggling to accurately measure its own temperature, causing it to shut down to prevent potential overheating. 90 Diagnostic Your boiler has detected an incorrect electrical reading from a temperature sensor, causing it to shut down to prevent potential overheating or damage. 931 Diagnostic Your boiler has detected an issue with the sensor system that monitors the internal resistance, preventing it from operating safely.