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What is wrong with my Radiant boiler?

Yesterday my Radiant boiler started to play up. The pilot light comes on when you turn hot water/heating on but goes out after about 20 seconds. It reignites straight away, but wont stay on for longer than a few seconds. The heating and water get warm, but no where near as hot as it should do. Does anyone have any idea what could be wrong before I make the dreaded phone call?! The boiler is only 4 years old and has been serviced every year
Zoe, November 2009
Your diverter valve is sticking. Get a new one .

2m00ns, January 2010
Radiant Boilers have a dedicated Help Line to answer questions like this, together with a full compliment of spares for these boilers up to 10 years old [next day delivery]
Tel: 0870 770 0414

Jim Bath [Technical Help Line], November 2009
link Click here to see other fixes for Radiant.