central heating wont work


Got a baxi back boiler behind gas fire the hot water heats up it is a gravity system works without the pump. The central heating would not heat up but found that the pump was siezed, replaced the pump but it still wont go the burner wont fire up to heat the system. any ideas please thank you.
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Not sure I understand fully - the water heats up but the burner won't fire up?
TonyB

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