Ferroli Falcon (Mk 1) Causes of Shutdown v Lockout

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Hi all - I have a Ferroli Falcon (Mk 1) which shuts down after 2-3 of running then lights straight up again on CH and on DHW.
It is not locking out so I am trying to eliminate everything that could cause a lockout.
Can anyone confirm if the limit stat, overheat stat, APS or low water pressure would cause a lockout so that I can eliminate these?
I think it may be the flow thermistor - but because it is occurring on both CH and DHW, I am doubtful that both thermistors would have the same problem?

Thanks all..

 

[ShaunCorbs]

I’m afraid it’s time to get a gas safe engineer out

 

[Timlazisa]

Hi all - I have a Ferroli Falcon (Mk 1) which shuts down after 2-3 of running then lights straight up again on CH and on DHW.
It is not locking out so I am trying to eliminate everything that could cause a lockout.
Can anyone confirm if the limit stat, overheat stat, APS or low water pressure would cause a lockout so that I can eliminate these?
I think it may be the flow thermistor - but because it is occurring on both CH and DHW, I am doubtful that both thermistors would have the same problem?

Thanks all..

I agree with Shaun not something that can be diagnosed on a forum. It could be any number of things and maybe even a couple of things together. Good luck