new combi boiler not making rads HOT!

alocacoc

hi weve had a new combi boiler fitted a glow worm 30c the chaps coming back on monday but heres the prob beforehand

quick rundown

hot water is piping hot

but the rads are only what Id call warm all the temps are whacked up on boiler and thermostat

you can hear the thing working away makes a clicking noise every thirty secs like a staple gun

the outlet pipe for the rads is piping hot but the return is cold

theres what I think is another outlet pipe going towards upstairs which is not as hot as the thick outlet

Ive bled all the rads and they seem fine

what next

thanks

latecomer

Have you checked that the lockshield valve is open?

alocacoc

hi yes all thats done

ormus

whats clicking away like mad?

EliteHeat

Check the valves under the boiler. It sounds like the return might be shut and the noise you are hearing is the automatic bypass valve operating.