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Hello,
I have a problem with my Worcester Greenstar 42cdi. It was working fine until yesterday. when I noticed that the hot water would not get hot. upon further investigation, I am even more baffled.
The boiler is in the upstairs bathroom.
1. Bathroom sink, (closest to boiler) gives warm water.
2. Bath, warm water.

If I run both taps at the same time, the bath tap goes cold, but the sink tap gets hot. I cannot get the bath tap to give out hot water. Also no hot water from the kitchen sink.

Any help greatly appreciated as wife is frustrated!
 
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Got any mixer taps?
Try isolating the cold inlet to the boiler and see if you still get water out of any hot taps.
 
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Ive found the problem!...
the garden hosepipe is linked to the hot water system, It was fitted a few years ago but never been used. It is connected under the kitchen sink, (hot and cold merge into the one pipe which goes outside to the hosepipe).

I switched the hot on to fill the swimming pool for the grand daughter and forgot to switch it off afterwards. Obviously, it is not a one way valve as when this valve is open, the cold water is running into the hot water pipe.
What type of valve should this be?

Thanks for your help
 
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