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homemaintenance

Can anyone help,Have had to renovate part of an underfloor heating system in a barn conversion which is approx 15 year old.the original system manifolds were leaking and corroded and the control system was seized and u/s.the original system was for most part UPonor so i replaced the manifolds with same manufacturer but the pipework had to be adapted as originally it was 19mm so had to adapt to 20mm,i also fitted a new thermostatic mixer valve and ups 15/80 circulating pump,all pipework was in 28mm copper.The problem i have is that i cannot get system to circulate,all the flow pipework is hot including manifolds but the return is cold and stays that way,i have flushed the system several times and bled all all air out of system,have checked several times but still no luck,according to the flow gauges there is no flow but have tried to find out why but cannot find a reason.
The original system was installed with no isolating valves whatsoever,the old part of system not changed still has no isolating valves,i have fitted valves to the new part.
Has anyone got any suggestions as to why i cannot get a flow reading or why i cannot get return working.
frustrated:confused5:
 
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