Hi DC, or whoever else can help me, PLEASE? Following on from Gemma's enquiry, i too have a Ferroli F24B combi which will supply hot water on demand, but will not supply the central heating system (just stopped working!!!). I've followed DC's advice and completed a full reset on the clock, with all of the switches in the appropriate positions (still didn't work). I then, as DC suggests, joined the two black wires labelled 3 & 5, and the central heating works. ("don't forget to turn off the electricity to the boiler before removing the cover" great advice!!!). This is obviously a very short-term fix, but if the central heating works with these two wires (3&5) connected (or hotwired), does this mean that the DIEHL timer/switch unit is knackered?? Like to add at this stage that the clock and all of it's functions seem normal. Many Thanks in advance for any help you could offer. TA

Mark, March 2008

ferroli boiler no hot water or heating and flash

syed, January 2013

Hi all i also have a f24b hot water works fine but wont heat up the radiators. So by passed the wires 3&5 good as new thanks for your help.

tus, December 2010

Hi. Have you got it sorted? I have an older ferroli combi boiler, can't see a model, and have been told the Diehl timer is no longer made, I have found Diehl timers on t'internet from borggeneral north america that look the same but different model. I'm thinking of trying to get one, but then I need to find someone to fit it, if it will fit. lizhewitt@zoom.co.uk

Liz, October 2008