Saunier Duval Opalia F24E Fault codes & diagnostics

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

Water Heater Natural Gas 24 kW Discontinued
Download the Saunier Duval Opalia F24E manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

This boiler uses indicator light combinations

Note which lights are on, off, or flashing and at what speed. Match the combination to the cards below. Do not reset until you have noted the pattern. How to read fault codes →

Fault codes

All 1 documented codes

Tap any card for details

Safety indicator (4) lights

Your boiler has detected a safety fault and shut itself down to prevent any potential danger.

Emergency Engineer only £120-250

Parts commonly replaced

  • Flue fan
  • Air pressure switch
  • Overheat thermostat sensor
  • Printed Circuit Board (PCB)
Full explanation for Safety indicator (4) lights