PLUMBERS HELP! Ihad new boiler installed 1 month ago,central heating wont function properly.When system is....

drained,then refilled to boilers recomended pressure,all is o.k. after releasing air .However once heating is turned off,the system follows the same pattern allways,on start up,heat only comes to a couple of upstairs pipes,and the boiler keeps firing up for a short while,then firing down,repeating constantly.there... show more drained,then refilled to boilers recomended pressure,all is o.k. after releasing air .However once heating is turned off,the system follows the same pattern allways,on start up,heat only comes to a couple of upstairs pipes,and the boiler keeps firing up for a short while,then firing down,repeating constantly.there are no error codes displayed on the boiler.I tried running heating for 1 day constant on first start up after draining,all was o.k. but next day back to the same pattern,HELP!
Update: Istaller has been back 3 times and removed old zone valves and bled system of air till all is ok .the system is unconventional,namely twin pipes that run along skirtings in each room,with covers over them.the pipes have air release fittings in each room,all was well before new boiler was fitted,its a heatline... show more Istaller has been back 3 times and removed old zone valves and bled system of air till all is ok .the system is unconventional,namely twin pipes that run along skirtings in each room,with covers over them.the pipes have air release fittings in each room,all was well before new boiler was fitted,its a heatline c24/c28.the installer is not convinced a power flush will cure,and has not charged for anything more than the installation.he is corgi reg and a good man,though we are at our wits end and so is he.
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