Vaillant Turbomax 824/828 Fault codes & diagnostics

1 fault code with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

Combi Natural Gas 24-28 kW 1997-2005 Discontinued

Replaced by: ecoTEC

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Fault codes

All 1 documented codes

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F.13

Your boiler has detected an electrical short circuit in its internal temperature sensor, causing the system to shut down for safety.

High Engineer only £95-160

Parts commonly replaced

  • NTC Temperature Sensor
  • Wiring Harness
  • Main PCB
Full explanation for F.13