Why does the blower fan of a gas furnace keep running after turning off the thermostat?
When you turn off your thermostat, you expect your gas furnace to stop running, but sometimes the blower fan keeps running. This can be annoying and lead to higher energy bills. There are a few reasons why this might happen:
- The fan timer is set too high. The fan timer controls how long the blower fan runs after the furnace turns off. If the timer is set too high, the fan will continue to run for an extended period of time, even after the furnace has stopped heating.
- The furnace is overheating. If the furnace is overheating, the blower fan will keep running to cool it down. This can be caused by a dirty filter, a blocked exhaust vent, or a malfunctioning blower motor.
- The thermostat is malfunctioning. If the thermostat is malfunctioning, it may not be sending the correct signal to the furnace, which can cause the blower fan to keep running.
If your blower fan is running for more than 30 minutes after you turn off the thermostat, there may be a problem. You should call a qualified HVAC technician to diagnose and repair the issue.
Related Questions and Answers
- Why does my gas furnace blower fan run continuously? It could be due to a high fan timer setting, overheating, or a malfunctioning thermostat.
- How long should the blower fan run after turning off the furnace? It should run for 30 minutes or less.
- Can I turn off the blower fan manually? Yes, but you should only do so if there is a problem with the furnace.
- What are the signs of a failing blower motor? Noisy operation, vibration, and reduced airflow.
- How can I prevent my blower fan from running too long? Clean the filter regularly, keep the exhaust vent clear, and have the furnace serviced annually.
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