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Rayburn boiler runs heating system, radiators tepid

BLEDRADIATORS, WHAT DO I CHECK NEXT?

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If you can hear a slight humming from the pump, it may be powered but stuck after a long period of unused. A slight tap on the pump housing sometimes is enough to get the impellor turning freely again. Or flicking the on/of switch of the pump, which did it for me. There will be more noise and a gluck gluck sound from any bubbles in the pipe once the pump starts circulating the water.

Posted on Dec 03, 2012

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What is the temp at the boiler? there is a temp/ presure guage it should read 160-180F. If that is OK then check the circulating pump. When the thermostat is turned up you should hear a little water moving through the piping as you have adjusted the system. If you hear nithing circulating you may have a defective pump.

Good Luck, Phil

Posted on Dec 11, 2008

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In your case, the diverter valve has most likely failed. Normally, when the heating is on this senses when there's a demand for hot water and temporarily diverts the primary hot water circuit to feed the domestic hot water heat exchanger. When the demand for hot water ceases the primary hot water circuit is diverted back to the central heating heat exchanger. The valve has a number of moving parts including a rubber diaphragm which can wear out and split and moving shafts which can seize.

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Call a heating engineer out as soon as possible; I'm not going to advise how to do the repair yourself as gas appliances MUST be serviced by qualified persons only for reasons of safety. If you're lucky then the valve simply needs cleaning up and a few new diaphragms plus other minor seals and rings. If it's gone too far then the valve and possibly the manifold it's attached to will need to be replaced.

In the UK the part alone typically costs between £100 to £200 depending on whether it's just the valve or the manifold as well. The diaphragm kit typically costs up to around £15 and is routinely fitted when the boiler is annually serviced, and a new valve will already have new diaphragms fitted. For a routine service expect to pay for up to two hours labour (many can be done in one hour), but if the valve/manifold have failed it will be longer as one failure often causes other parts to need further inspection/repair.

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2 Answers

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yes tami
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1 Answer

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A.

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