Bryant Gas Furnace - blower sarts and stops
We have a Bryant gas furnace (model 394GAD I think). When the thermostat calls for heat, the burners start up, then after 45 seconds or so, the main blower. After about 3 minute, the blower stops, but the burners remain on. Then 30 seconds or so later, the blower starts up again. Three minutes or so later, blower stops, burners continue, then after 30 seconds, blower starts up again. Keeps repeating this cycle until temperature on thermostat reached - then whole furnace shuts off (blower and burners). Any ideas?