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worcester highflo 400 no heating?

my worcester highflo 400 combi gives me hot water but no central heating boiler fire for on demand water but not for the c/heating ahn ideas
adri, February 2009
Doesn't actually fire for heating at all? No fan, no pump, does not recognise the demand?

Hmm.. possibly programmer or room stat fault, failing that PCB.

Bunslinger, March 2009
link Click here to see other fixes for Worcester.