Common problems guide

The most common Saunier Duval Opalia F24E problems

The faults most likely to send a Saunier Duval Opalia F24E into lockout — with plain-English causes, what to check first, estimated repair costs and whether you need a Gas Safe engineer.

This model is discontinued. Parts can be harder to source and expensive. If repair costs are mounting, a new A-rated boiler may be the smarter choice.

The 3 most common faults

01

Fault finding (Page 9 - 10) High Engineer

Since the specific manual pages were missing, we cannot identify the exact fault, but your boiler has detected an internal issue that is preventing it from operating correctly.

Est. cost: £120-300
Parts: Ignition electrode, Gas valve, Control PCB

Full guide for Fault finding (Page 9 - 10)

02

Safety disconnection (General) High Engineer

Your boiler has detected an issue preventing it from igniting, resulting in a loss of hot water service.

Est. cost: £120-250
Parts: Gas valve, Ignition electrode, Printed circuit board

Full guide for Safety disconnection (General)

03

Safety indicator (4) lights Emergency Engineer

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

Est. cost: £120-250
Parts: Flue fan, Air pressure switch, Overheat thermostat sensor

Full guide for Safety indicator (4) lights

Parts most often replaced

on the Saunier Duval Opalia F24E

Ignition electrodeGas valveControl PCBPressure sensorPrinted circuit boardFlue fan

Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.

Call a Gas Safe engineer if…

You can smell gas or see signs of a leak
The Saunier Duval shows an Emergency or High severity code
The boiler keeps locking out after repeated resets
You've tried the DIY checks and the fault hasn't cleared
There's visible water leaking from the boiler
The flame is yellow or orange instead of blue

See the full 3-code list for the Saunier Duval Opalia F24E