If you have a roof fan, also commonly referred to as an attic fan, that has stopped working, chances are the motor has burned out. When this occurs, heat that rises from inside the home cannot be vented out to the home's exterior, causing your air conditioner to use more energy to cool the home. Replacing a roof fan motor is fairly straightforward and a novice can accomplish the task.
Things You'll Need
- Drop cloth
- Eye protection
- Screw gun
- Fan motor
Turn off the breaker supply electricity to the roof fan on the main electrical panel. Never work on an electrical appliance with power still flowing to it. Put down a drop cloth to catch any dust that may fall when going into the attic/roof. Situate a ladder under the roof fan.
Put on eye protection and climb the ladder. Remove the vent by unscrewing the mounting screws on the edges of the vent. Pull the vent away carefully, as debris and dust may fall from the opening as the vent is pulled away. Hand the vent to someone helping you or climb off the ladder and place it on the floor. Do not try to balance the vent on the ladder while you are working on the fan; it may fall and damage the floor or hit a pet or child.
Locate the motor and remove the wiring. In some cases, it is simply a single plug; in other cases, electrical wires run to the motor. Use a pair of pliers to remove the electrical wiring if it does not simply unplug from the connection. Be careful not to pull too hard with your hand or pliers, as you could damage or break the wires.
Unfasten the fan motor from the motor mount with a wrench or screwdriver. On some roof vents, the motor is secured by bolts, on others, by screws. Loosen each bolt or screw but do not completely unfasten them. Rather, make the bolts or screws loose enough to turn by hand. Hold the fan motor with one hand and then unfasten the bolts with the other. Do not situate your head directly under the fan motor; it could slip from your hands and strike you in the head. Hand the fan motor off to someone or climb off the ladder and place it on the floor.
Install the new fan motor. Align the new roof fan motor with the mounting holes and insert the bolts or screws into the motor mount. Tighten the bolts or screws with a wrench or screw gun. Tighten firmly against the mount to prevent vibrating or shaking. Reattach the wires by hand. Turn the breaker back on and then turn the fan on to test it. Replace the vent.
- "Ultimate Guide to Home Repair & Improvement"; Creative Homeowner Press; 2006
- "Residential Ventilation Handbook"; Paul H. Raymer; 2009
How to Replace an Attic Fan
Often, an attic fan fails without the homeowner even knowing it. Hot climates can be particularly damaging to the bearings. The average...
How to Install a Roof Attic Fan
An overheated attic can cause roof shingles to curl or bulges in roofing felt. It is also a cause of high cooling...
How to Replace Ceiling Fans
Ceiling fans cool a room in the summer, distribute heat in the winter and add to your home decor. If an old...
How do I Silence a Noisy Attic Gable Fan?
Attic fans are designed to keep a more even temperature in the attic space by drawing in cooler air through a home's...
How to Fix a Leaking Roof Vent
Your home's roof is its "Achilles heel," the place where it is most vulnerable to damage from wind, rain and flying debris....
How to Replace an Attic Fan Motor
The motor of an attic fan runs on a constant basis, as otherwise the flow of air out of the house from...