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Hi Ollski, Thanks! See above -- it turns out the flowswitch is to blame. I intend to get in touch with Baxi because their troubleshooting flow diagram doesn't have a branch -- but could easily incorporate one -- to check for this kind of fault. Best wishes, Hamish

True. I sort of thought that perhaps the valve had failed as well as the PCB, but the later in the day it got, the more muddled my thinking became! Thank you so much for pressing that point! I thought I had reasoned that all the demand components were okay, but this morning I tried...

Ollski, Thanks for your response. 1) Do you mean that the white slider switch I described should physically move -- i.e., I can see the movement of the valve behind the actuator motor by the movement of the white switch? 2) Should I be able to move it manually myself? 3) If it doesn't...

Hi all, I am completely new to this area so please be gentle and if you use any jargon, please include a brief explanation! We have a combi boiler (Baxi Bahama 100). Domestic Hot Water works fine. Central Heating doesn't work at all. The CH circuit pipes running into and out of the boiler...