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The Natural Philosopher

wrote:
3 storey house, top floor rads stone cold, as are pipes in and out.
The feed-and-expansion is working fine, pressure is 1.5 bar in the
system, no bleeding necessary. Only 1 rad on ground floor, 3 on middle
2 on top - botoom two fllors rads are working fine.

Is this just a question of balancing? Boiler is powerful, new
condenser fitted two years ago.

It's getting cold.... any suggestions? Thanks.

G
May have a complete airlock.

Try turning off all rads completely except one upstairs, and running
pump flat out.

That may be enough to push air out of pipes into rads where it can be bled.