Why is my blower motor clicking?
Loud clicking sounds can be heard when inducer blowers and fan shafts are clogged by buildup or when bearings are worn out. Bearings on the main blower motor might click as the furnace runs because the shaft is rusted or dirty. Worn out bearings can cause the motor to burn out if not replaced in time.
Why does my blower motor keep turning off?
If your blower is constantly turning on/off when the furnace isn’t heating… …you most likely have a bad fan limit switch. The system uses a “temperature probe” to detect temperature changes inside the heat exchanger (see image below) and turns your blower on and off in response.
Why does my fan keep shutting off?
Check for frayed wiring: Frayed wiring within the fan’s housing can cause the fan to turn on and off by itself. If there are any issues, the wire connections should be secured and the frayed wires should be fixed with electrical tape, or cut and reconnected.
How do I stop my blower from making noise?
Adjust the fan speed. It’s often possible to select a lower fan speed, which will reduce static pressure as well as air noise. This fix only works when the fan speed was too high in the first place. Reducing the speed when the system was properly set up could result in a lack of airflow throughout your home.
What can cause a / C blower motor to turn off?
My best guess would be that the blower motor may have bad bearings or other issues causing it to draw too much current, causing the overcurrent protection on the motor to kick in and shut the motor off.
What happens when a blower motor relay wears out?
Without it, the AC system will not be able to circulate any heated or cooled air. The blower motor relay controls the current used to power the blower motor, and is subject to the constant on and off switching. Over time, it can eventually wear out.
Where is the blower control switch on the dashboard?
The blower control switch on the dashboard controls the circuit flow of the blower motor to adjust the voltage from low, to medium, to medium-high, to high. When on high, the circuit bypasses the blower resistor.
Why does my central AC unit turn off?
My central AC unit decided to stop on the hottest day of the year. It would start and run normally for a few minutes and then the blower would shut off. After checking the breakers, thermostat and overflow shut off (did not have one) I saw something about a blower motor capacitor.
My best guess would be that the blower motor may have bad bearings or other issues causing it to draw too much current, causing the overcurrent protection on the motor to kick in and shut the motor off.
What causes a bad or failing blower motor relay?
Blown fuses. One of the first symptoms of a bad or failing AC blower motor relay is a blown AC blower motor relay circuit fuse. If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current…
The blower control switch on the dashboard controls the circuit flow of the blower motor to adjust the voltage from low, to medium, to medium-high, to high. When on high, the circuit bypasses the blower resistor.
How does a furnace blower turn on and off?
The blower spins up, runs at a low speed for a few seconds, and turn off again. Eventually, after many attempts the blower fan will kick on and the AC will begin to cool again then rinse and repeat all day.