Id be interested to see a picture of this valve too. If it is the ITT 24v with brown control knob I may have a second hand one in my garage which I may sell to you. If it is a modulating valve as Agile suggests then you are in his hands ! Not seen one of those but assume it works on bellows...
Anyone come across fault code : A97 ?
No info in service book as to what might be the problem apart from 'electronic monitoring fault' !
Have checked flame supervision electrode and that gives an 'A03' fault when failed.
Can only assume at this point that it will need a new PCB.
Any...
Usually only takes half hour or so with Kamco FX Scalebreaker to clear completely in cold solution. Can also be speeded up by applying heat from blowtorch!! :twisted: