Sorry for the delay updating - had other problems come up :roll:
I tried hammering the pipe at the joint; no effect. Thanks though.
I've had the pump head off and cleaned the rotor. It was a little scratchy at first but rotates freely now. It definitely works. I couldn't get the union...
I'll try tomorrow. It's really difficult to get to because of where it's fitted right next to a beam under the floor.
Do I undo the bolts that fix the round part to the square part, and remove the round part to test?
I take it I have to isolate the water either side of the pump first...
Thanks folks.
Yes, there's water in the header tank (now that I've freed the ball valve)
The pump seems to be working - I've bled it, the hot water tank is getting hot and I can hear the difference in water flow into its heat exchanger coil if I change the pump's speed.
Still hardly...
We have an old gas boiler downstairs, a copper hot water tank upstairs and the central heating pump and manifolds are under the floor of the landing. There's a header tank in the loft. I know almost nothing about plumbing!
We last used the radiators a week ago. The hot water is used daily. My...