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Mend Potterton Performa 30 HE Central Heating Radiators Temperature

potterton performa 30 HE?

Hi water working fine but when central heating is turned on upstairs radiators work ok but downstairs nothing. Temperature on the boiler goes up to max very quickly and flow pipe is red hot, pump and trv's have been replaced and diverter valve checked. No fault lights showing . drain water downstairs and rad gets warm but cools as soon as draincock is closed Any help please
,

Tom
December 2013
switch heating ON
turn OFF all upstairs rads
leave downstairs rads ON
downstairs should heat up unless system blocked

http://www.youtube.com/watch?v=dO_eRPuh3Uc

Q
December 2013

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