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Mend Vokera Heating Boiler Shuts

vokera linear,no heating flow?

no code showing,but the boiler fires up then shuts down at 86 degrees, it then fires again at around 70 degrees.the flow pipe gets warm for about 2 ft but not flowing,return stays cold as do all rads.pump is working and the pump impeller is ok.hot water side is ok.any ideas on this problem.thanks.

ken.

ken
December 2008
thanks,will purge the system but found no air last time,no valves on the system,apart from boiler isolating valves.will let you know results.
ken.

ken
December 2008
you either have lots of air,need purge and water or valves closed,for example zone valves.

old guy
December 2008

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Mend repair fix Vokera home heating systems