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Intermittent boilet fails to fire on heating?

I have a 5 year old Glow-worm CX35i controlled by Drayton Digistat SCR and analogue timer (on the panel). The boiler is failing to fire on heating demand by the timer and also the 'on/off' switch on the analogue timer. It fires fine on hot water demand, so I guess the igniter is fine and the problem is with the SCR or the timer. I recently moved the SCR from one side of the boiler to the other (slightly further from the boiler casing but more in line of sight from the Digistat. Any ideas?
Andrew, April 2015
Have you performed a pairing function,if you go online to Drayton there are instructions how to do it

toptrish, April 2015
link Click here to see other fixes for Glow-Worm.