Hi all we had a power cut last night and ever since my cdI 30 bolier will not fire up and I am FREEZING!! on the display sceen is what looks like 2 back to back t's. When I turn the heating CH on green light indicates it 's on , then display counts upwards (flashes the T's then a number alternately) when it reaches 51 it turns the CH off again and does this every time I return the CH on?? Can anyone help I would be eternally grateful