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3 out of 7 rads working with hot water

My heating has been playing up for a while. upstairs rads working downstairs rads stone cold also have hot water.
The system has been flushed out twice with a flushing machine and new pump has been fitted. Now have 3 different rad are working all upstairs, downstairs ones are still cold. The boiler does fire up for a short time then cuts out HELP!!!

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This is a flow problem within the system and you have ruled out the two major problems already.
asuming the pump has been fitted in the correct way round and the pump isolation valves are open fully. have you tried closing down the radiator valves upstairs and forcing the flow around the downstairs circuit? also is there any zone valves on the circuit not opening.
Is it a conventional type system with a header tank ?

Posted on Mar 24, 2009

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