hi, we have just paid 1200 for a new glowworm combi boiler and ever since it was fitted (end of nov ) we have not had a drop of heat from our rads downstairs.....they were never boiling to start with but assumed the new boiler would sort that out(We inheritted the clapped out old thing when we bought the house last year ) upstairs is fine (not boiling)but enough to heat the rooms... we have had 2 power flushes,1 at the time of the new boiler going in and he has been back today and spent the day doing another power flush but we still have no heat??? can anyone pls help??? the house is freezing downstairs and we live in a rather large,high ceilinged semi!!!!!!