rads no heat

4 Feb 2010
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United Kingdom
i have a heat line vizo boiler, all radiators are now cold after i let all the air out of the tank and put 1 bar of air back in, bled pump and rads but still no joy ,can anyone help? thanks
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it fires up and the temp led indicators say that the temp is fine, hot waters ok too....and sorry
okay their are some pipes under the boiler
two them have a fillling loop attached the one that leads two 22mm
not the 15 mm is the reurn pipe
and at the other end the boiler their is another pipe which also 22mm
which is the flow pipe put your hands on these do they get hot
when on central heating only
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if return pipe gets warm the it travel all way round the system
check your rads are turned
yeah the rads are on, when the downstairs ones stopped working a few days ago, i let all the air out of the tank at the back of the boiler and then today i filled it back up to one bar and re-pressurised to 1.5 bar, before i did this the upstairs rads were fine
well im not sure which is the return pipe but there is only one pipe below the boiler that is heated

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