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Shop for VDO A/C Heater Blower Motor PM2728 with confidence at AutoZone.com. Parts are just part of what we do. Get yours online today and pick up in store. Jan 03, 2013 Do not try this at home! HVAC training is required. In this video I change out another Trane blower. I show a few of the steps of the process and a few of the tools I use. I also fins a rare.
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When the home’s thermostat detects that the living space is warmer than its programmed temperature level, a cooling cycle begins. The blower motor starts, turning fan blades that circulate cold air from the evaporator coils, through the home’s ductwork and into each room. If the blower motor fails to start, nothing happens. The living spaces gets uncomfortable as the cooling cycle stalls.
Thermostat
Most thermostats control both central air and central heat. Make sure the switch on the side of the thermostat is set to “Cool” instead of “Heat.” That will ensure that the proper mechanical system is operating. You can also turn off the heat and air conditioning, then slide the blower switch on. If the blower comes on in this manual setting, the thermostat may not be functioning properly and must be replaced.
![Electric blower motors for furnaces Electric blower motors for furnaces](/uploads/1/2/5/7/125781535/473460464.jpg)
Breakers
The home’s main electrical panel has a series of circuit breakers for each electrical loop in the house. The air conditioning system typically has two breakers that control power to the motors and condenser. Check the electrical box to see whether the breakers tripped. If so, the blower motor will not operate. Track down the reason the circuit breaker tripped, especially if it trips again after resetting. You may need an electrician to do this for you. Breakers offer a level of protection in the event an electrical loop overloads.
Microswitches
Metal access panels that cover the housing surrounding the blower and other air conditioning components are equipped with microswitches. These switches prevent the system from starting if an access panel is open. The blower motor is tucked away indoors, and is employed by both the central air conditioner and the furnace. Make sure all the access doors are securely fastened in place. Even if a door is slightly skewed or not quite locked into position, the microswitch may sense that the door is fully open. If so, it will prevent the blower motor from operating.
Blower Motor
If the thermostat, breakers and access panel doors check out, the blower motor itself may have failed. Motors have a long useful life, but they do seize up or burn out in time. You may want to call a repair person at this point. A qualified air conditioning expert can test the motor, find the proper replacement and install it. Although homeowners with knowledge of electrical systems and air conditioning may feel like tackling this job, safety concerns mean this work is best left to certified repair professionals.
References (4)
About the Author
Robert Korpella has been writing professionally since 2000. He is a certified Master Naturalist, regularly monitors stream water quality and is the editor of freshare.net, a site exploring the Ozarks outdoors. Korpella's work has appeared in a variety of publications. He holds a bachelor's degree from the University of Arkansas.
Cite this Article Choose Citation Style
Korpella, Robert. 'Blower Won't Work on Central Air.' Home Guides | SF Gate, http://homeguides.sfgate.com/blower-wont-work-central-air-62747.html. Accessed 21 June 2019.
Korpella, Robert. (n.d.). Blower Won't Work on Central Air. Home Guides | SF Gate. Retrieved from http://homeguides.sfgate.com/blower-wont-work-central-air-62747.html
Korpella, Robert. 'Blower Won't Work on Central Air' accessed June 21, 2019. http://homeguides.sfgate.com/blower-wont-work-central-air-62747.html
Note: Depending on which text editor you're pasting into, you might have to add the italics to the site name.
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