Domestic hot water problem with combi boiler

Hi I have a Worcester combi boiler which has a domestic hot water problem.
The central heating runs fine but the boiler no longer fires up when a hot water tap is opened.
However, if the boiler is already running for the heating, opening a hot water tap will get you hot water. At the moment the only way to take a shower is to fire up the CH, jump in the shower and finish quickly (i.e. before the boiler reaches the CH cutoff temperature and shuts off the gas fire)!
Any advice on what might be causing this would be very much appreciated. Regards Herminio
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Hermi wrote:

diverter valve i would think, depending on model then i needs to be replaced
easy job, identify from manufacturers book and replace
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Hermi wrote:

or could be flow sensor type device????
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Dear Gav,
Thank you for the advice. If you don't mind, can you please tell me where I might be able to find the manufacturer's book? Its a Worcester Heatslave 9-24.
Many thanks, Herminio
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Hermi wrote:

try a google for it, unless they can send one by email or post fr4om worcester-bosch
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They have various pdfs on the worcester site, might eb there to download.
--
Chris French


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