Hi all,
Thanks for the reply.
I am merely the customer at the end of the day using the corgi as the primary engineer to solve a problem.
I found the documentation you referred to but it is blank, not having been completed either by the installing company or the service one.
There was no further follow up as regards future service or advice as to requirement for such from the installing company.
Yes, I have been an electronics engineer all my life and fully appreciate the necessary attributes towards logical problem solving.
The gas pressure at the inlet on fire-up only drops by an almost immeasurable amount indicating to my mind the valve is barely opening, if at all.
There is no pressure measurable at the valve outlet also indicating the control system is not really opening the valve to any extent.
The decision making has primarily been on the advice of the corgi but the fault, given these parameters, seems logically to lie either with the valve or it's control system. As referred to before when the replacement board was fitted it came up with a completely unrelated fault where the fan did not even attempt to run at all.
The corgi did not check the flue restrictor ring. I would assume this would be the responsibility of the installing engineer at the time of installation.
The remaining item is the ignition burner pressure.
While there has been no adjustment to the pots I know from experience to normally leave such adjustments well alone if you lack the proper information or leave any alteration to an expert.
The corgi has not, to the best of my knowledge, made any changes in this area.
Soft light setting was also checked indicating 32%, within limits as indicated in the manual.
While the problem is a failure to ignite the gas there must be gas passing through the valve to ignite in the first place. Hence, as this did not seem to be the case, the ignition electrode was changed anyway followed by the valve assembly and finally the control board.
Non of these approaches came up with a solution. The gas valve continued to behave in exactly the same way with all these attempts although with the replacement board, as it indicated a completely different and unrelated fault condition, would also prevent ignition as the sequence would likely terminate anyway but for a different reason entirely.
I think if I had been the actual engineer working on this fault I would have adopted very similar reasoning in seeking a solution.