Sorry yes, I mean the programmer.

Are the transformer low voltage point and Zagas 125 pcb fuse easy to
find? Can you provide directions?

BTW, the overheating switch has not tripped (it pops up doesn't it?).

And now the low pressure light (only) has come on. Still nothing on the
programmer display. I don't think the sytem really is at low pressure
because the indicator says 1.5 bar. However it probably was low until I
topped it up.

Thanks again