Other Blower Fan Won’t Run Problems The fan will run and blow warm air but only in FAN or FAN ON mode – delivering heat – but NOT in AUTO mode. This is a bad temperature sensor in the unit; replace the fan limit controller.
What would cause a furnace blower not to kick on?
Make sure that the power cord hasn’t melted or a fuse hasn’t been blown. If your cables are looking fine, try unplugging the fan for a few minutes and then plugging it back in again. Sometimes, this process can reset the motor and solve your furnace problems.
How do I reset my blower fan?
How to Find and Reset your Furnace Motor Blower
- Step 1: Turn off the power to the furnace. …
- Step 2: Remove the blower compartment cover. …
- Step 3: Make sure the blower is completely cooled off. …
- Step 4: Locate the reset button. …
- Step 5: Press the button in (assuming that this is your issue and that the button has popped).
What would cause my AC to only run when the fan is turned on and not on auto?
If the fan is the only thing running when the AC unit isn’t, there may be a faulty relay switch prohibiting the settings on the thermostat from being communicated to the fan. Another cause could be a wiring issue or a short circuit preventing the system from recognizing the on and off signals.
Where is the blower motor reset button?
Locate the reset button on the furnace and press it to reset the furnace. It is usually located inside the blower compartment on the side of the blower motor. Be cautious as the housing may be hot. If the button is popped up, press it down.
Can you run furnace without blower?
The furnace can produce heat inside the combustion chamber—but that heat won’t go anywhere if the blower fan isn’t running. Because there’s a danger of the furnace overheating without the blower fan, the furnace won’t operate unless the blower has power.
How do you know if the furnace blower motor is bad?
Poor or Airflow from Air Vents
This will be the first and most obvious sign your blower motor has a problem. It may or may not indicate that you need a replacement motor. If there is no air or very weak airflow coming from the air vents, the motor may be clogged, or it may be malfunctioning.
Why is my blower fan not working?
If you see or hear the fan turn on, your blower motor is not the culprit. If the fan does not start, you have a wiring issue (circuit breaker trips) or motor problem (circuit breaker does not trip). While your thermostat may be at fault, only an HVAC technician can diagnose and remedy the issue correctly.
Where is the fan limit switch located?
Quote from Youtube video: Right behind the electrical gas valve. And it's located in the heat exchanger area.
How do you troubleshoot a blower motor?
Quote from the video:
Quote from Youtube video: Now if by chance both windings read a measurable resistance that most likely means you have a mechanical issue with the blower such as a seized blower.
Should my furnace fan be on auto or on?
“auto” is the best setting for your furnace fan in the winter. It will aid in saving energy and money while also working to keep your home at an optimal temperature. However, for summer, “on” is the best setting for your furnace fan.
Should fan be on auto or on?
Keeping your fan on AUTO is the most energy-efficient option. The fan only runs when the system is on and not continuously. There is better dehumidification in your home during the summer months. When your fan is set to AUTO, moisture from cold cooling coils can drip and be drained outside.
How do I test my furnace blower?
Quote from the video:
Quote from Youtube video: And then you put one probe on there and one to the l2. Common neutral bar right here and you should read 120 volts. If you read 120 volts. And your blower motor is not turning on then.
How do you test a blower fan?
Quote from the video:
Quote from Youtube video: It's two little prongs inside of her. So what you want to do basically is just take one end don't let these two in touch together will be the same sparks as if you was touching.
How do I test my AC blower fan?
Quote from the video:
Quote from Youtube video: Board you can test this by jumping out 120 volts directly to the blower motor wires.
How do you test a blower motor relay?
Connect a test light or multimeter to the ground (black lead). Turn the ignition key to the on position (engine off), and remove the relay. Using the probe, test all terminal sockets in the relay connector. Two of the four should have power.
What relay controls the blower motor?
The blower motor relay controls the current used to power the blower motor, and is subject to the constant on and off switching.
Where is the blower motor relay fuse located?
Quote from the video:
Quote from Youtube video: The blower motor fuse is located in a small fuse box just next to the passenger.
