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Tony, Many thanks for the advice. I'll see about sourcing a replacement. She's an old boiler for sure but money to short in supply right now, so will have to keep the old girl in harness for a while yet. One observation though. I've tried removing the controller altogether and still the...

Hi, We have an ancient old Potterton Netaheat boiler which has served us well. I've just switched it back on after Summer to make sure it's good to go when needed, only to find there's a problem. The problem is that irrespective of the controller (Siemens RWB9) being set to off for both HW...