What the manual says
Manufacturer manualignition
What causes this fault?
This fault occurs when the boiler attempts to start up but fails to establish or maintain a stable flame during the ignition sequence. The most common reasons are worn-out sparks that cannot light the gas or a faulty sensor that fails to detect the flame once it is lit.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Avoid the next call-out bill
A cover plan would handle faults like S.03: no call-out fees, no surprise bills.
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Related fault codes
All 47 fault codes on the Flexicom cx
Seeing a different code? Every code this model can display, in one place.