No, a traditional standing-pilot gas furnace will not run or produce heat if its pilot light is out. The pilot flame serves as the essential ignition source required to light the main gas burners whenever your wall thermostat calls for warmth. Furthermore, built-in safety mechanisms ensure that the system remains completely dormant when the pilot is unlit; as soon as the flame goes out, the thermocouple cools down and cuts off power to the gas control valve, preventing fuel from flowing to the burners. While the indoor blower fan might occasionally run if triggered by residual heat or manual fan settings, no combustion or heating can take place until the pilot is manually relit. You can verify that the furnace is disabled by checking that the main burners fail to ignite when adjusting the thermostat.
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