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May 12, 2021 · Look into your air filter’s housing and check the markings on your filter. If your furnace blower won’t turn on, check to confirm the arrows on the air filter are pointing in the correct direction. When the arrows are pointing in the wrong direction, change the orientation of the filter. Next, check the vents around the blower.
- One of the 24v Electrical Safety Switches Inside the Furnace Has Tripped. A furnace may have the following safety switches. If any of these are electrically open, the blower motor may turn on and stay on until the switch automatically resets or is manually reset.
- A Bad Thermostat. If the thermostat is not calling for heat, air conditioning, or fan to turn on, yet the fan is running, a quick test can be performed to see if the thermostat is the problem.
- Bad Thermostat Wiring. · This may be due to a thermostat wire being flattened by a staple, or having been chewed by an animal (e.g. mouse, squirrel, etc.)
- The Control Board Has Closed Contacts that are Welded Together. · Turn on the power to the furnace. · If there is no power measured on the G, Y, and W terminals, but there is 120 volts on relay contact going to the blower fan motor either on the heat or on cooling terminal, this indicates that the contacts inside the relay are welded together.
- It’s a Thermostat Setting Issue. Most thermostat issues originate at the thermostat, and blower motor issues aren’t different. If your blower isn’t turning, you most likely have a faulty thermostat.
- The Thermostat is Faulty. Still, on the thermostat, you may also want to diagnose it for internal damage. If the thermostat is broken, the furnace may not work.
- The Fan isn’t Getting Power. Hopefully, you’ve confirmed that the rest of the furnace has power. You’ll know you have power if the burners light up when you turn on the furnace.
- The Blower Motor Capacitor is Defective. We’ve mentioned that the blower motor gets starting power from a special capacitor. These capacitors are fairly powerful, typically ranging from 200V to 450V.
In this HVAC Training Video, I Show 6 Reasons Why the Furnace Blower Fan Keeps Running and Blowing Cold Air! Troubleshooting is Performed to Show How to Figu...
- 11 min
- 221.2K
- AC Service Tech LLC
Jul 16, 2017 · Cold air blows out it will run for an hour or two and before it gets to temp the blower motor shuts off while the compressor continues to run. Then at this point the evaporator coils tend to freeze (sometimes). Then, the blower motor seems to try to run every 10 minutes or so. The blower spins up, runs at a low speed for a few seconds, and turn ...
Jun 21, 2023 · There are a few possible causes of a furnace fan not turning off. Here are some of them: Faulty thermostat: If the thermostat is set to ON instead of AUTO, the fan will continue to run. Faulty fan limit switch: The fan limit switch is a safety device that prevents the fan from running too long. If the fan limit switch is faulty, it may not turn ...
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Jul 27, 2022 · This article covers the 10 most common reasons the blower fan does not turn on! A blower motor may be installed in a forced air gas or oil furnace, air handler, or packaged unit. There are multiple reasons why the motor won't start and these are based on the type of unit, controls, and the blower motor type.Problem # 1: Capacitor When an HVAC unit is equipped with a PSC (Permanent Split ...
