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Looks like the Diverter Valve may well be the problem. Next step is to get one and find out :-) Thanks ZAD for your thoughts they are much appreciated. Cheers Dave DDSK

Hi ZAD Okay on getting the gas guzzlers out :-). I was lucky in as much as a mate of mine had also replaced the pcb on his 105E but without success it turned out to be the temp sensor in his case. Have you noticed the number of guys who have posted this exact problem. I was quite amazed that no...

Thanks for the tip on the diverter valve, I have the service manual so will take a look. The fault finding guide is to say the least somwhat sketchy :-). If I wanted CH then the easiest way to do it was to unplug the HW temperature sensor. Then I get CH, albeit the sensor warning led flashes...

Hmm looks like I messed up with my earlier reply sorry. Anyhow I have the same problem, so did ZAD in May 2008, exactly the same description of the fault, except mine was intermittent for a while. Anyhow I can't tell you I fixed it, only what I have done. I checked both CH and HW temp sensors...

Well I am not a central heating engineer, but I have dabbled with my 105E instant combi,and Have not as yet resolved the problem except at the moment out of the blue it started giving me CH and the radiator led lit of course. I have had this before though, and it was intermittent. Anyhow I...

Hi ZAD I saw your posts regarding the 105E Combi Instant. You described exactly the same problem I have with mine. Did you get it resolved, and if so what was it :-). I have changed the CH temp sensor HW sensor, and the circuit board but no luck, still the same. Any help appreciated Cheers DDSK