How do you fix a gas furnace that wont turn off

Check the thermostat. The thermostat may be set too high, causing the furnace to run continuously. Turn the thermostat down to a lower setting and see if the furnace turns off.
Check the air filter. A dirty air filter can restrict airflow and cause the furnace to overheat, which can lead to the furnace not turning off. Change the air filter and see if the furnace turns off.
Check the flame sensor. The flame sensor is a safety device that shuts off the gas supply to the furnace if the flame goes out. If the flame sensor is dirty or damaged, it may not be able to detect the flame and may cause the furnace to not turn off. Clean the flame sensor and see if the furnace turns off.
Check the gas valve. The gas valve is responsible for controlling the flow of gas to the furnace. If the gas valve is faulty, it may not be able to shut off the gas supply to the furnace, which can cause the furnace to not turn off. Replace the gas valve and see if the furnace turns off.
Check the blower motor. The blower motor is responsible for circulating air through the furnace. If the blower motor is faulty, it may not be able to circulate air properly, which can cause the furnace to overheat and not turn off. Replace the blower motor and see if the furnace turns off.

Why is my gas furnace blowing cold air? The heat exchanger may be cracked, the gas valve may be faulty, or the air filter may be dirty.
Why is my gas furnace making a loud noise? The blower motor may be faulty, the flame sensor may be dirty, or the gas valve may be faulty.
Why is my gas furnace not heating my house? The thermostat may be set too low, the air filter may be dirty, the flame sensor may be dirty, the gas valve may be faulty, or the blower motor may be faulty.
Why is my gas furnace running constantly? The thermostat may be set too high, the air filter may be dirty, the flame sensor may be dirty, the gas valve may be faulty, or the blower motor may be faulty.
Why is my gas furnace smelling like gas? There may be a gas leak.

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How do you fix a gas furnace that won't turn off?