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siemens programmable room thermostat?

why does my central heating keep going on and off when I have set it with a programmable siemens room thermostat
muriel, November 2011
bad zone valve,stuck relay,stuck check valve getting gravity,don't forget heat loss where it just keeping temp.i would take off t'stat. for awhile and see if it still happens for starters.

Old Guy, November 2011
link Click here to see other fixes for Siemens.