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Hot water but no heating?

I have a Potterton boiler, I get hot water but the boiler doesn't kick in to heat the radiators.

It's a
Potterton netaheat 10-16 mk 2 F
Randell 4033 timer
honeywell themostat

Any Ideas?
John Colman, December 2006
Do you mean the Grundfos pump as that seems to be running.

John Colman, December 2006
motor in diverter valve packed up

stu, December 2006
link Click here to see other fixes for Potterton netaheat 10-16 mk 2 F.