No idea as I have never needed to
I very much doubt it is the converter, these things are very well built and Q control has to be A1 as their products are exported all over the world. More a pump drive or pump itself failure I reckon.
Anyway, sorry but the box most likely needs to be pulled
JC



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so I'll be replacing this one my self, I still have Ashcroft Hd converter in the shed so I may get it tested, 

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