i switched off heating for summer then 2 weeks ago switch them back on no heat in rads.it is not the pump the pipes are choked and i can not get them cleaned out because there is no circulation going round the system 
cold rads
- Thread starter george warren
- Start date
I would suspect the pump first and foremost, even if there is noise/vibration from the pump, there is no guarantee that it is displacing water. If it is not on max already turn up the pump speed (black or white control knob, dependant on pump manufacturer) and try again.
Hi have you bled all the rads?
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