the central heating has just been turned back on on my oil fired heatslave 20/25 only to find it does not work, normally we select on on the boiler turn the room stat and it come on . If you turn the boiler off at the mains the diverter valve arm moves .turn the power back on and the valve arm goes back in , but valve arm will not move across when you call for cental heating.

mel perkins, November 2008

I don't know if to say " you're lucky "

My Worcester Heatslave 20/25 is giving me central heating , but no hot water !

Peter A, October 2009

Hi, Just had the same problem. It was the programer on the front of the boiler, but if you are using a room stat you don't need it. Just refit the panel that came with the boiler from new or link the ch & hw control wires to the L terminal and then central heating will work off room stat only.

Yekralc, November 2008