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Recently I accidently set off my alarm, I reset in the normal way but now none of my devices are recognized. I tried to do a walk test but when the I press the learn key on any of the devices the system no longer recognizes them. I have tried removing one of the devices but now...

I have a Grundfos 15-50 pump - when central heating turned on gets extremely hot and pipe around pump are all hot. However rads downstairs are cold, rads upstairs are hot. I have flushed all rads downstairs with water to remove sludge etc. but still rads do not get hot. Have tried turning...