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Thanks. I'd just like to rule out a few things before I call anyone out. I'll have another look in daylight.

Thanks for reply "does the microswitch make on the pressure diff"? The red light on pcb comes on and off with hot water demand if that is what you mean, or should I be looking for something else.

Hi. Apologies if I'm covering old ground, but I could not see the same problem. So Potterton Puma 80 perm. pilot CH works fine, but DHW takes 5 mins to kick in, occasionally much longer, and sometimes quicker, and it is fine when it does start, but just a bit of a pain. Just wondering if the...