Some units do not use a capacitors to run the blower motor.
Furnace blower motor capacitor symptoms.
Delivering torque to the fan motor if the capacitor is faulty there won t be enough power delivered and the blower wheel fan belt and other important components can cease to operate.
Heat pumps and air conditioners use a dual run capacitor which connects to both the compressor and the fan while furnaces use a single run capacitor connected to the blower motor.
Have two capacitors called a start and run capacitor.
To inspect the capacitor make sure it is discharged.
If the furnace is receiving power turn up the thermostat and see whether the blower motor starts within the next few minutes.
Most are found on the compressor.
This is the most common design type.
Its capacitor works like a battery and stores the energy needed by the blower to work properly.
The capacitor helps the fan motor run.
Some models include an auxiliary start capacitor that helps jump start the motors.
Have only a single capacitor.
The blower then moves the warmed air into and through the ductwork in your house.
The blower motor in your furnace blows hot air through the ducts and into your home.
Your furnace uses a lot of energy so to supply the extra energy needed to power the blower gas furnaces have a capacitor.
While the run capacitor stays on giving the motor extra torque when needed.
If not the capacitor or the blower motor is not functioning properly.
That means the start capacitor is only needed at the beginning of each cycle while the run capacitor runs throughout the cycle.
Problem indicators what you can do.
Similar to the outdoor fan motor capacitor it is a small single two terminals capacitor that will help start and run the indoor blower motor.
Once it is discharged use a capacitor tester to check the.
How to check a run capacitor.
Indoor blower motor run capacitor.
A bad or faulty capacitor can exhibit many signs and symptoms.
A start or run capacitor can be combined into one capacitor called a dual capacitor with three leads but can be split between two separate capacitors.
Not have a capacitor at all.
To answer this question the panel door to the furnace will need to be removed.
Before checking the capacitor make sure the fuse controlling the furnace is flipped to the on position.
But with a bad capacitor your blower cannot function well and may put your family s comfort at risk.
