no heat to down stairs radiators?

Find the circulating pump and increase the speed.

Turn up the thermostat control on the boiler by a notch.

Balance the radiators i.e. close off the outlets (lock shield valves) a bit on the upstairs rads and open them up a bit on the downstairs ones...see...

http://www.miketheboilerman.com/balancing.htm

so that the available heat is being shared more equally between upstairs and downstairs.

Peccavi
February 2009