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Vallient boiler showing f28 but pressure is fine?

Please help. My boiler is showing the above but the pressure is fine. Was working normally a few days ago!

Steff
December 2013
Heating, Home Heating SystemsPressure Fine Help
F28 ignition failure
would need to check all components involved in ignition sequence
-fan
-gas supply
-spark
-detection
& BURNER SEAL

Q
December 2013

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