Thermostat appears to be working, but the central heater is not ?

Fan switch is set to AUTO, when i move system switch from OFF to HEAT position, i could hear the electrical relay switch in the thermostat, but the heater would not turn on. No air is blowing. Was working before. Tried reset the central power furnance switch in the garage, still the same. Central AC is still... show more Fan switch is set to AUTO, when i move system switch from OFF to HEAT position, i could hear the electrical relay switch in the thermostat, but the heater would not turn on. No air is blowing. Was working before. Tried reset the central power furnance switch in the garage, still the same. Central AC is still working. Any ideas what the problem maybe or suggestions on how to trouble shoot ?
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