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Mend Worcester Bosch 28si

Worcester bosch 28si lockout?

My Worcester 28si keeps locking out shortly after firing.
I have ruled out primary sensor, dhw sensor, fan air pressure switch, pump, gas valve, burner and blocked heat exchanger.
The flue is fine and so is the pressure vessel.
I'm thinking either overheat stat or flame sensor fault now.
Any experience of this anyone?
Cheers.
Steve.

Steve
May 2008
Worcester BoschWorcester Bosch 28siHeating, Home Heating SystemsWorcester Bosch 28si
kleen the probes on the burner these sense the flame has ignited and hold the gas valve open

ryan
May 2008
flame rec is good possability

iain
May 2008

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Worcester 28si Lockout - Help & Troubleshooting