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Heating hot water through taps but radiators wont heat up

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You need to bleed your radiators - air has built up at top of radiators and water cannot flow- there will be a cover at end of radiator on one end or the other- very carefully turn venting cap until air comes out it will change to water and stop- repeat at all radiators- be sure you are turning right part of vent and be gentle - if it feels like you need Hercules strength -you are turning wrong part.At the end of this go down and verify boiler pressure of 15 psi

Posted on Nov 11, 2008

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check the pressure control that switches the element on or off
if it is faulty then it switches on when the tap is turned on dropping the pressure but it will not recognize that the increase in pressure when the tap is turned off so it keeps heating the water.

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Heatslave diverter valve


clicking rads are due to pipe expansion when getting hot.
If the hot water [secondary circuit] gets hot and the boiler stays on [does not keep going on and off] even with a constant low water flow then the diverter should be ok.
there is a valve to prevent the primary circuit [central heating] [ CH] from sending water to the rads. this or its control may be at fault.
both the
Both the CH pipes to & from the boiler should have manual valves to turn off. do this then try the hot tap-full on. If the boiler goes into overheat mode and the overheat stat kicks in to turn the boiler off -- then :-
Check also the heat exchanger, it may be furred up especially if you are in a hard water area. It means taking it off and manually checking [pour water through] If you're lucky it will be just muck to be forced out with hose pipe pressure, if not a new one

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yes tami
there should be a pressure rellief valve fitted.
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