Radiators hot while running hot water taps

Joined
19 Jan 2007
Messages
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Location
Leeds
Country
United Kingdom
System is:vcw-sine 18 t3 w (gc- no. 47 044 01)
While running the hot water tap the radiators get hot without the heating being on.
I have looked through the forum but still confused as to what part fault could cause this.
I have an instruction book and thinking if this is a diy job (i know its an old boiler,but seemed to be reliable).
Any advice and tips to repair fault would be much appreciated.
Thanks in advance
 
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Thanks for the reply but when you say diverter valve is this the flow switch in the manual.Do i replace the valve or does it contain parts that can be replaced,i.e diagpham,wax capsule(thermostatic element)?
thanks mick
 
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Wax cap is a common one to go , and replaceable.
 
Fitted new wax capsule two days ago and boiler seems to be back to form.
thanks for your advice much appreciatted
 

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