Worcester combi boiler intermitently heating radiators

2 Oct 2009
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United Kingdom

Our Worcester combi boiler is only intermitently heating the radiators. Around 30% of the time the heating system reaches only lukewarm and then maintains this temperature as though it has reached its full operating temperature, firing up and switching off as normal to maintain this lukewarm temperature.

We have no problem with the hot water which operates at full temperature without fail.

Whenever we use the hot water, once the taps or shower are turned off, the radiators heat up to their normal temperatures. This again happens without fail, although sometimes after a period of time the heating system will revert to its lukewarm status. Running the hot water for thiry seconds or so will cause the heating system to kick back into action again.

I would be grateful for any advice.

Thanks in advance
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