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I installed the sensor as suggested, and it's working well. A good result: the boiler turns itself down as the outside temperature increases. The house no longer gets oppressively hot, and the radiators are generally cooler to the touch. The boiler also cycles less. Thanks all for your...

OK - so I called them this morning and they have sent me the instructions! So here they are for anyone else that needs them: I must connect the sensor to X3, pin 1 and 2 then set dip switch 2 to "on" (flip down the front of the control panel to access them). Then the temperature dial on...

Yes, I always wondered why a room thermostat wasn't installed when our heating engineers designed and specified our system. I'd been meaning to fit one for some time... Thank you for the links. I will check them out! Andrew

Hi John, Thank you. We do have TRVs on all the rads. We don't have a room thermostat. CH cycles on and off regularly. We set the dial on the front of the boiler to the mark about the 2pm point on the dial. Seems to run the CH water at 60-70 deg C. In the evenings the boiler runs for...

What about OpenTherm? Can I connect a modulating thermostat to the WB1A? I want to try to avoid the endless cycling of the boiler and the fact that our radiators get very hot and we always seem to be fiddling with the temperature control on the boiler. thanks, Andrew

I was never sure about which model it was but I told him the type code. He phoned Viessmann but must not have told them the right thing. I have now found the installation manual and there's no mention of it there. Must not be supported. Oh well, I was looking forward to having that...

Yes, they did. The guy at Viessmann Spares did - he phoned Viessmann tech support. I'm beginning to wonder if I've been told porkies! Do we know either way? Thanks, Andrew

Hi All, I have a 2005 Viessmann 100 type 7179916 I recently purchased a Viessmann original weather compensation sensor for use with this boiler. I was told it would come with instructions but it doesn't! 1) Does anyone know how the weather compensation sensor should be connected? 2)...

Yes, have done... Thanks, Andrew

Hi Guys, Thanks for all your help and advice. The boiler was installed over 5 years ago. Sadly, we only realised the existence of the Viessmann service after getting our local heating engineers involved. They replaced the ignition module but it didn't solve the problem. I'd previously...

Hi Tony, Sorry I didn't supply that info - I'd already gone beyond that stage in my investigation. It's F4'ing. The current ignition module is turquoise. It is being replaced today by my local heating engineer but I don't have confidence that replacing it will fix the problem. I have...

Thanks guys... Looking at £200 for the pcb. Is there a cheaper way? I've no way of knowing whether any of the others listed in my original post will "do"... I can get these rather cheaper. Thanks, Andrew

OK - so I've checked and our boiler is a 7179916 - it seems to need 7828516, but I don't know whether that's the only part that is compatible. Andrew

Hi all, I've got one of the above boilers and I suspect the ignition module and control unit are faulty (after the research I have done). No volts are going to the ignition module... Can anyone tell me: Are the different part numbers of control units interchangeable? Looks like the...