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Siemens RDJ10 thermostat, not switching on my central heating?

I have a worcester bosch Greenstar 28i Junior combi-boiler, with a Siemens RDJ10 thermostat. I have set the times for the thermostat and comfort setting, but my central heating doesn't come on. What am I doing wrong?
AC, October 2009
how can i download a manual for this thermostat so i can know how to operate it
as i lost the original one

liz delanbanque, October 2009
link Click here to see other fixes for Bosch Greenstar.