My Drayton DigistatSCR unit looses boiler control. the green light stays on, but ,will not fire up boiler, the pulsing red light flashes once every 30 seconds, 3RF unit is comunicating and although flame sign is on, no SCR control. The way I reinstate the SCR unit totalk to stat unit is to switch off mains at SCR boiler unit, and ,switch on power again, after a time lag the Digistat SCR restarts comunication,red light flashes, and green light comes on and boiler lights. There is no sequence to this fault. I have brought the stat closer to the control unit, no change.

JohnSe, February 2010

there is a very common fault on the scr,

email me at

bach.dai1970 (at) gmail.com

and i can tell you how to fix it

Dave Cardiff, April 2012

I am having the same difficulties
Any solutions?

Mirza, October 2010

Having exactly the same problem myself. seems to fire up as and when it feels like it. getting extremely frustrated. Anyone???
seems to be the override function that's not "talking to " the boiler. green light comes on scr but doesn't always light up the boiler.
Help!

Ian, October 2010