BoilerFaultCodesWhat the manual says
Manufacturer manualIgnition fault
What causes this fault?
This fault occurs when the boiler tries to light but fails three times in a row, leading to a safety shutdown. It is physically caused by a lack of gas reaching the burner or a failure in the ignition system, such as a worn-out spark electrode or a faulty gas valve. If you have a prepay meter, check that you have credit, as a lack of fuel is a frequent trigger for this error.
In extremely cold weather, this code can be triggered if the external gas regulator freezes or if there is a blockage in the condensate discharge pipe.
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 F28: no call-out fees, no surprise bills.
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Related fault codes
All 52 fault codes on the Flexicom hx
Seeing a different code? Every code this model can display, in one place.