What Controls Blower Motor Speed

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What controls the blower motor speeds in a heater system?

A blower motor resistor or a blower motor control module is the part that controls the speed of the blower motor.

Will a blower motor work without the resistor?

Without any power, the motor won’t run. As a result, the blower fan stays still and silent, and no air blows out of the vents. There are instances where a bad resistor will prevent the current from reaching the blower motor altogether.

How do I change the speed on my blower motor?

You can increase or decrease the blower speed by slightly adjusting the pulley on the blower drive motor. To increase blower speed, slightly loosen the setscrew that holds the pulley to the driveshaft. Move or turn the pulley clockwise on the shaft one turn, then tighten setscrew.

Is an ECM motor variable speed?

The term “Variable Speed” actually refers to the blower motor inside the furnace or air handler. It’s an Electronically commutated motor, or (ECM). ECM’s are DC motors that function using a built-in inverter and a magnet rotor, and as a result are able to achieve greater efficiency than most AC motors.

What does the blower motor resistor control?

Blower resistors are resistors which are used to control the fan speed of automotive blowers. The fan speed can be changed either by switching the blower resistor resistance mechanically using a rotating lever, or electronically by the air conditioning system.

What are the signs of a blower motor resistor going out?

Loss of HVAC fan control (total or certain speeds). The fan only works on its highest speed setting. No air coming from vents. Intermittent or inconsistent fan speed.

How do I know if I need a new blower motor resistor?

Fan does not work at all, so no air comes out of the vents. Fan only works on some speeds and not others. Fan only works on the highest speed. Fan runs all the time and can’t be controlled with the fan switch. You see smoke coming out of the vents.

What happens when a blower motor resistor goes bad?

If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. The heating and air conditioning systems may still function at one speed, however the resistor will have to be replaced in order for full functionality to be restored.

How do I test a blower motor resistor?

Place one lead of the Ohmmeter on terminal 1 of the resistor. Place the other lead on terminal 2 and check against specifications. If this circuit is open, showing infinity on the Ohmmeter, the blower resistor must be replaced. Move the lead from terminal 2 to terminal 3 and check this reading against specifications.

How can I make my furnace blower faster?

When increasing the blower speed, loosen the setscrew a little bit. This is the part that holds the pulley to the furnace’s driveshaft. Turn the pulley one rotation clockwise on the shaft. If you want even more speed, do two rotations.

Does a ECM motor require a capacitor?

The ECM is one way of saving on energy costs. One of the characteristics of the ECM is that they do not require adding an external run or start capacitor.

How does variable speed blower work?

A variable-speed blower runs at different speeds to precisely control the flow of heated or cooled air throughout your home. On a mild day, the blower runs slower. The AC or heat runs in longer cycles so the indoor temperature does not spike up and down, thus making overall efficiency higher.

What does a blower motor regulator do?

The Blower Motor Regulator controls the speed of the blower motor in your vehicle’s heating system. The regulator consists of a set of three resistors or terminals that generate a voltage to vary the speed of the motor.

Where is the blower motor capacitor?

It’s common for HVAC blower unit fan motors to use a start/run capacitor. Those will be located in the blower cabinet, often right on the blower motor itself.

Can a blower motor get weak?

Similar to other components in an HVAC system, the blower motor will become more vulnerable to mechanical failures as it experiences more wear and tear over time. If your air conditioner is aging and becoming increasingly problematic, there’s a good chance the motor is in trouble.

Should you replace blower motor and resistor at the same time?

We do suggest that you replace the resistor at the same time. It may not be critical, but this will keep the system more uniform. The issue may even be related to the resistor. If you know that it is not related to the issue, then you do not have to replace it.

Is a blower motor and a blower motor resistor the same thing?

The blower motor switch is the actual switch or button on the dash that you use to increase or decrease the fan speed. The blower motor IS the fan. The blower motor resistor is what allows the fan to work at different speeds as opposed to just off and on.

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.

Where is the blower motor relay located?

The blower motor relay is generally located in the under-hood fuse box or in the under-dash fuse box. A blown fuse can mimic relay failure. A failed blower motor switch can also give many of the same symptoms.

How much does it cost to replace blower motor resistor?

The average cost to replace the blower motor resistor at a repair shop is between $44 and $55 in parts and $70 in labor costs, for a total cost of around $114 to $125.

How much is a heater blower motor resistor?

A blower motor resistor costs anywhere between $1 and $400. Factors that can affect its price include its condition, configuration, material, and set or kit inclusions. Labor may cost you an extra $45 to $55, depending on your area.

How long should a blower motor resistor last?

The blower motor resistor is designed to last for the car’s lifespan. In most cases, these resistors will wear out long before the car does. Usually, the wear that the blower motor resistor has is due to the constant use that it gets and the heat that it is exposed on a regular basis.

Is there a fuse for the blower motor resistor?

A fuse is often located on the resistor board. The fuse only protects the low and medium blower speeds. High speed will still work if the resistor fuse is blown.

Can furnace fan speed be adjusted?

Once you cut the power, you can remove the cover of your furnace to get access to the control board. Adjusting the pulley on the blower driver motor lets you increase or decrease the blower speed.

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