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Thanks for your reply, although apart from stating the obvious it wasn't much use! Anyway, I think I have sorted the problem. After taking the boiler covers off the DHW started working working. I can only think that a stray cable was obstructing the microswitch hence no hot water.

I have finally got around to purchasing a CMT927 and have today connected this up to the boiler with connections A & B in the relay receiver (BDR91) to connections 1 & 2 within the boiler with the link cable being replaced. This works and the stat turns the boiler on and off as required...

Just to point that that I have resolved the problem. This was caused by a melted venturi. I hope that this was caused by a fault on the original PCB (that was reporting flame failure) rather than the replacement!

Hi, I'm looking at purchasing a thermostat for my Performa 24 and have come across the CM921 / CM927 controls by Honeywell which seem to get a good writeup. From what I have read, this would be suited to the boiler however there is a section the the manual that states "NOTE: If the room...

Does anyone have any thoughts on this? I have since checked the airflow switch, testing with a meter shows that the switch goes between the terminals. I have also replaced the overheat stat as this was thought to be faulty, but appears not to be the case. Thanks

Hi All, I've just moved house and after moving in I found that the boiler had the flame failure light lit. After following the fault finding section of the manual decided to purchase a replacement (2nd hand) PCB. This fixed the problem for a short while, but I found that the controls for...