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hot water but no heating?

i have a potterton 2000, i have hot water but the central heating is not coming on.
ER, March 2011
yes

sam, March 2011
I have exactly the same problem. Of the 3 lights the left one is off, the right one is on but the middle one only flashes. Think this is the problem.

Jasper, March 2011
link Click here to see other fixes for Potterton.