Hi (repost)

I am the midst up doing up my bathroom and Friday afternoon removed a
radiator, including the valves (i.e. leaving open pipes at each side). I
foolishly thought that since the heating was off for the summer it wouldn't
matter.

When a small amount of water appeared I figured that was because the 3-way
valve might have to make its way past the "heating" position, and capped the
pipes off on Saturday.

Today (Sunday) the hot water is refusing to heat up.

I figured there might be air in the system and found a little screw on the
infeed from the boiler to the hot water tank. I loosened this temporarily
and some air came out followed by a small amount of water, but the pipe to
the hot water tank is still not getting hot so the water inside the tank is
not getting hot.

I checked the CH expansion tank and that is OK, i.e. it hasn't run out of
water, it seems to fill OK when the level drops.

The boiler is definately working as is the pump. In fact they are working
overtime as the water in the cylinder never gets warm enough to switch them
off !

Any ideas what else i should look at ?



Stuart