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Hello Got a Vokera Compact 24 Boiler in a sealed CH system. Boiler works fine with hot water but when asked to serve CH it fires up fine but cuts out after 25 secs and keeps trying every 4-5 mins...no radiators are getting warm and the return flow pipe is cold...there is no external...

Hi Guys...long read but trying to give you as much info as poss! Boiler: Vokera Compact System: Sealed Problem: Boiler seems to work fine and holds pressure well, hot water works fine too but all (except one) of six radiators do not warm up whatsoever...the one that does work, takes ages...