Any plumbers on here?

[Northy]

Our central heating pump is badgered - bearings are shot. So I tried to change it today. I shut the isolation valves at either side and loosened the lower nut carefully, some water came out as I expected. I kept mopping it up, more came out, I mopped it up..... etc.

I thought, geez this pump shouldn't hold this much water and then I heard the tank filling up and realised the pipes were getting warm again from the hot water in the tank.

So I'm guessing the isolation valves aren't working. They turn freely enough, is that right?

What's wrong?

Anyone local wanna come and do it for me?

G