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Hot water problem Worcester Heatslave 20/25?

The boiler fires up to provide hot water if a hot tap is used- even if the boiler control button for hot water is off, the radiaters are switched on and working fine, but cant seem to stop it firing up when a hot tap is used. It has had a new diverter valve which did not cure the problem and suggestions would be welcome
Dek, November 2008
Hi my heatslave 20/25 programmer has frozen on Twice I cannot scroll to off or any other settings any ideas ?

Chris from Wales, September 2013
Do you have a twin channel programmer fitted?

If so check programmer is set to "off" as boiler should only fire for hot water in an "on" period.

If not, check programmer connections/wiring (this may not be something you can do yourself). Possible also a stuck relay on pcb.

If you have only a single channel programmer then the boiler can only work off the tank stat and will fire every time water is used.

Bunslinger, November 2008
link Click here to see other fixes for Worcester Heatslave 20/25.