Hi All

Some help plz.

Just installed 2 radiators in the kitchen, replacing the 2 old ones.
One
was a simple changeover and the other required new pipe work , but all
pretty simple. I took care to match the inlet/outlet with the new
radiators. House is 14 years old and water more clean than dirty.

Powered up the heating and whilst there is water in the radiators,
it's
stone cold. Even the pipes are cold.

All the other rads are hot (except one in the lounge which has hot
pipes but
cold rad).

The previous rads worked v. well but now its cold.

I replaced lockshield for lockshield and put turn valves on the right
pipe.

Any idea's or checks I should be doing. I even tried the pump on high
speed.

Actually took out the air vent for hot water to slowly (very slowly)
start to seep through. Once the vent was closed it cooled down again.

Pipe work was mainly couplers with solder inside + 1 compression
fitting.

Any help appreciated.

Matt