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Thanks for the quick reply. I got a bottle of Sentinel x400 sludge remover from B&Q. Should I just pour it into the tank and wait?

I have been having a problem with my CH. Water is ok(slightly lower temp than normal perhaps) but the rads are all cold. Pump is new, control system is new, thermos are new and all have worked well previously. Figured it was sludge so drained the system off. All the rads are empty but the feeder...