There is a fan switch that senses the temperature in the heat chamber that turns the blower on when reaches temperature and off when it cools down enough sounds like it went out. should be black cover or metal box on front of chamber with wires going to it. good luck
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Turn of the system at the thermostat. If you turn off the blower, assuming you mean at the tstat, there's no need to turn off the pilot. If blower is running and won't stop, even if turned off at tstat, turn off power by any means necessary, and pilot does not need to be turned off. A "standing pilot" is made to stay lit at all times, running or not.
let me guess.....its electric, right? could be so many things! do this first. turn power off. check all wiring for burnt or broke wires., usually at connections. next turn system on. does blower stop running and then breaker trips? if so its blower motor or blower relay. if blower and wires are ok then problem is probably a broken heating element.
If you have a non digital type of thermostat and a gas furnace, it will have an adjustable anticipater as part of the thermostat. In a normally operating system the average anticipater setting is 0.4 amps. Or simply .4 . Incorrect setting can cause the heat to turn off early or late.
If the burners are staying on but the blower turns off you could have a faulty blower motor. Sometimes replacing a faulty blower motor run capacitor will extend the operational life of the motor.
If it comes and goes on all speeds, I would say its probably the blower motor. You would check for power and ground at the blower motor when it stops running. If its only on one speed, it may be the blower resistor.
Is there a setting on the thermostat for Auto or Fan? If so, make sure it is in the Auto setting. You will have a contactor that turns on the elements and a relay for the fan. Follow the wiring diagram to see which relay energizes the fan then unplug it to see if the fan stops.