Table of Contents
How do I know if my furnace blower motor is bad?
What Are Signs Your Blower Motor Needs to Be Replaced? Poor or Airflow from Air Vents. This will be the first and most obvious sign your blower motor has a problem. No Airflow At All From Vents. Skyrocketing Energy Bills. Strange Noises When You Turn on the Heat. Overheating Blower / Weird Smells.
How do I test my furnace blower motor?
How To Check your Furnace Blower Motor (7 Steps) Step 1: Turn off all power to the furnace. Step 2: Remove the Furnace Access Panels. Step 3: Use your voltage tester to ensure no electricity is flowing through the furnace. Step 4: Feel the area near the blower motor to determine if it’s hot.
How do you test a blower motor with a multimeter?
Using a multimeter set on the Ohm scale, use the positive lead and test the black wire. To check the purple wire for current, use your ignition key and turn it to the run setting, turn the heater power to full power and set the multimeter to DC power. If your meter reads “no current” the motor is no good.
What can cause a blower motor to stop working?
In most cases, a blower motor resistor fails due to corrosion or overheating. Sometimes, the mechanical resistance to the motor rotation causes an excessive electric current that can overheat and prematurely damage the blower motor resistor.
Should a blower motor spin freely?
If the fan turns at all without forcing, it should spin when powered up. If the fan turns freely or not is not a definitive indication that is good or bad.
How do you test a fan motor?
How to Test Your AC Fan Motor Check the power. If you suspect the fan motor is bad, the first thing you should check is the power to the motor and the power to the air conditioning unit. Check the windings. Next, check the windings of the fan motor for an open or a short. Inspect the capacitor.
Do all furnace blower motors have a reset button?
All furnaces are equipped with a reset button. They are generally red or yellow and are located inside the blower compartment. The reset button is a safety feature that will shut down the furnace when a problem is detected, often a hot or overheating furnace, before it trips the circuit breaker.
How do you reset a furnace blower motor?
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).
Why is my furnace not blowing hot air?
Heater Not Blowing Warm Air Because of Thermostat Settings. Make sure you check the thermostat which controls your HVAC system. If your thermostat is set correctly and your heater is still not coming on, you may have a faulty thermostat. If these fixes do not work, a call to an HVAC professional is in order.
How do you know if it’s the blower motor or resistor?
The most common symptom of a bad blower motor resistor is the blower motor will only work at one or two speeds. It can also cause the blower motor to stop working completely and you will notice no air coming from the vents.
How do I know if my fan motor is bad?
Be aware of the following signs and symptoms of a bad AC fan motor. AC Fan Doesn’t Start. Even though you have the AC turned on, the fan does not start. AC Fan Doesn’t Stop. Slow Rotating Blades. Outside Fan Blades Are Still. Rattling, Humming, and Buzzing Noises. AC Runs Intermittently. No Cold Airflow.
Can you lube AC fan motor?
While most current models of air conditioners have motors that don’t need to be oiled, many older units require periodic oiling to keep the fan in good condition. Oiling is recommended at the beginning of every cooling season. This is also a good time to inspect the fan blades and motor for signs of wear.
How do I test my furnace?
Fortunately, there are steps you can take to test these types of furnaces before calling a professional for an inspection. Step 1: Check the power connection. Step 2: Look at your thermostat. Step 3: Inspect the furnace filter. Step 4: Reset the unit. Step 5: Inspect for physical damage.
Should a motor have continuity?
The windings (all three in a three-phase motor) should read low but not zero ohms. It will usually be low enough (under 30 Ω) for the audible continuity indicator to sound. For proper motor operation, all windings must have megohm readings to ground, i.e. to the motor enclosure.
What does a reset button look like on a furnace?
All furnaces are equipped with a reset button. They are generally red or yellow and are located inside the blower compartment. The reset button is a safety feature that will shut down the furnace when a problem is detected, often a hot or overheating furnace, before it trips the circuit breaker.
