Post
by PaulthePlumber »
Fri Mar 27, 2009 4:40 pm
Hi, you def have a gravity hot water system and pumped heating, first thing to check is the expansion tank (the small tank in loft) has it got water in it or is ball valve stuck? iif so free ball valve end of problem, if not could be blocked cold feed as already suggested or air, would not advise removal of boiler thermostat yourself to boil the primaries however if you find a drain point fill it up off the mains water pipe, this will take push the water through system and up into expansion tank, if tank fills first then overflows cold feed to system is probably fine and it is air which should now have been pushed out, if water comes through vent pipe over tank first cold feed is probably blocked, you could combine the two in the loft and see if that works otherwise cold feed should be the smaller pipe (15mm) going into the 1" primary return off the cylinder good luck Paul