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Thanks for your replies guys. Turns out that the diverter valve had failed so this has been replaced and we now have hot water. Unfortunately, where the boiler had been leaking for so long the screws had corroded in place - meaning our boiler guy had to drill them out! Hopefully the CB24 will...

Thanks AGAS, I'll try that in the morning. As for the voltage measurement, I was following the diagnostic flow chart in the installation/commissioning manual but got stuck at the point where it asked if the diverter valve spindle was moving. I'm assuming the diverter valve needs to come out...

Thanks for your reply. We have purchased the property and have already completed so I think the cost of this one is on us. If I were to get someone in is this an expensive job? Thanks again Dan

Good evening all, We have just moved into a property but found we have no hot water from our Alpha CB24 boiler. The central heating works fine but even when it's running the hot taps run cold. I have done some diagnostics but am now stuck... - There is 24v across M5 terminal 16 and M6...