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I have been experimenting with my system some more. I have a potterton suprima 40L boiler in a 3-bed flat with 7 radiators, one of which is currently out-of-circuit. The CH and HW are on separate zone-valves. I emptied the old water out of it and filled it with new (plus fernox inhibitor &...

OK, I think I was onto that actually when I found the PCB connections diagram inside the shell. thanks a lot for confirming though! I certainly did not know about the wsahing-machine application though.

thanks for that oilman... wish I'd known to clean it before I put in fresh inhibitor though! But it's a relatively new system (2 years), and I think I'll leave the cleaning for next year.

I am inspecting inside my boiler, and am intrigued by the following: there is a rubber pipe leading from inside the fan-box, out to the electronics compartment on the boiler. It connects to what looks like a diaphragm module. there are electronic connections to this diaphragm module. there is...

Thanks for confirming my suspicions! when inhibitor is added it will circulate around the system and mix nicely with the water, becoming a sort of coolant. Assuming that coolant is lost only by water evaporation from the expansion&feed tank, will I lose inhibitor via evaporation this way also...

Need some education on my CH/HW system. it's an open vented pumped system with a new potterton 40 boiler. should the mains feed to the expansion&feed tank be left ON for normal operation? the ballvalve operates correctly. I get the feeling that it should be, but surely this might introduce...