Viessmann Vitola Biferral Fault codes & diagnostics

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

Regular Oil 1980-2005 Discontinued

Replaced by: Vitola 200

Download the Viessmann Vitola Biferral manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

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 2 documented codes

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0D

Your boiler's burner has shut down for safety because it failed to light or stay lit correctly.

High DIY-safe £120-350

What to check first

  1. Check if your fuel tank has run out of oil
  2. Press the illuminated reset button on the burner control box once
  3. Ensure any external fuel valves are fully open

Parts commonly replaced

  • Oil nozzle
  • Photoelectric cell (Flame sensor)
  • Ignition electrodes
  • Fuel pump
Full explanation for 0D
35

Your boiler has failed to ignite or start its heating cycle and will not provide warmth or hot water.

High Engineer only £180-450

Parts commonly replaced

  • Burner control unit
  • Ignition electrodes
  • Oil pump
  • Flame sensor
Full explanation for 35
Status & diagnostic codes

1 operating states & engineer diagnostics

Not faults — these are normal operating states. Tap to expand.

26 Diagnostic Your boiler is stuck in a self-diagnostic test mode and cannot proceed to heat your home or water.