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So this has happened a few times now. My 24cdi decides to fire up in ch mode, despite the time clock being off and the stat being wound right down.
The boiler fires continually with no control over water temperature, it's like it is stuck in commisioning mode. All the rads get extremely hot and the pressure is above normal levels. I'm all for swapping out the pcb, but wondered if anyone had any suggestions or experience of this particular fault?
The boiler fires continually with no control over water temperature, it's like it is stuck in commisioning mode. All the rads get extremely hot and the pressure is above normal levels. I'm all for swapping out the pcb, but wondered if anyone had any suggestions or experience of this particular fault?