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Bumping.

Another update: I've set the boiler thermostat to just above zero, as low as i can get it, and put both HW and CH on. So the rads are slightly warm. The RCD hasn't tripped since i did this a few hours ago. I've just gone into the loft to feel the pump and it feels warmer than the rads but...

Thanks for the replies guys. I've turned the boiler thermostat down to zero and had CH and HW on for a good few hours with no trip. Obviously it is just pumping cold water around. The pump feels very slightly warm to the touch. Does this prove that the pump is OK? Or could the pump be...

Apologies in advance if my terminology or explanation is poor but i only have a rudimentary understanding of how the system works. So i have a fully pumped CH and HW system - there is a Glow Worm Fireblaze back boiler in the kitchen and in the loft is a hot water cylinder, grundfos pump and 3...