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No central heating with combi boiler?

We have a GREENSTAR24i junior combi but have been without central heating for past 2 days.Have tried override, changed batteries in thermostat and also switched off completely and started again but no heat.Water is ok.Any suggestions?
Paul Baker, March 2009
What does the pressure gauge read?
Should be around 1 bar. Tap the gauge to make sure the needle isn't stuck.
If this is O.K. then probably diverter valve. Can you hear this move when you turn on a hot tap?

M, March 2009