worcester 24CDi - problem with hot water supply.

[colcurly]

i have a worcester 24 CDi combi boiler, ( about 5 years old ) and it has started to play up, when we turn a hot water tap on, it fires up but the water stays wuite lukewarm, even though you can hear/see the boiler working.But when the central heating system is in use, and we use a hot water tap,the water temperature is as hot as it should be. ????

any ideas why this is happening. before i have to call someone out to
check it out.

[Kenj]

This may be caused by the Gas Regulator ( which sits just above the gas meter) not opening enough on low demand, and so only allowing a trickle of gas to get to the boiler.

If this is the case you will notice a big difference in the flame between when water only and CH are demanded.

If the the Gas Regulator is faulty it will cost you nothing. The Gas supplier is responsible for maintaining this. I had this problem and the gas man came and replaced it within 3 hours of reporting the problem.

However, you may need to have an heating engineer verify the problem before the Gas company respond.

[htg engineer]

Diverter fault. Probably stuck in CH state - when hot taps is running does CH flow get hot ?

htg

[colcurly]

[quote="htg engineer"]Diverter fault. Probably stuck in CH state - when hot taps is running does CH flow get hot ?

htg[/quote]

yes , the radiators feel warm when a hot water tap is used.
had it looked at this morning, but the firm now say the price for then doing it would be a lot higher than getting a worcester engineer out to do it ?/
cant believe it.
if it is the diverter valve how easy is it to cahnge it myself ?

[htg engineer]

Not too difficult, turn off cold water open all hot taps, drain boiler. Change diverter - renewing all fibre washers.

Turn on cold water and check thoroughly for leaks then re-pressurise system.

htg