BoilerFaultCodesMalvern 20/26 Fault codes & diagnostics
0 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Regular Natural Gas 5.8-7.6 kW 2000 onwards Discontinued
GC Number 41-555-18
Download the Malvern 20/26 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 |
|---|---|---|
| 41-555-18 | twentytwentysix | 2000–present |
Status & diagnostic codes 2 operating states & engineer diagnostics
Not faults — these are normal operating states. Tap to expand.
2 operating states & engineer diagnostics
Not faults — these are normal operating states. Tap to expand.
14 kW Diagnostic Your boiler is displaying its power output rating rather than a fault code, which often indicates that the internal electronics are failing to recognise the system's operational status. 24 kW Diagnostic The figure you are seeing is not an error code, but a technical rating of your boiler's power output and gas consumption rate.