When a fan malfunctions, the problem is usually loose or dirty blades.
If the fan won't operate or if it's noisy, cleaning and tightening will
usually fix it. Here's how to repair a room air conditioner's fan:
What You'll Need
You'll want to have these tools on hand to repair a room air conditioner's fan:
- Soft cloth
- Screwdriver or Allen wrench
- Long-blade screwdriver
- Wrench 20-weight nondetergent motor oil
- Volt-ohmmeter or multimeter
Open cabinet and locate fan. Step 2:
Clean away any debris with vacuum and soft cloth. Step 3:
Check fan blade on motor shaft for looseness. Blade is fastened to shaft with setscrew at hub of blade.
setscrew with screwdriver or Allen wrench. If air conditioner has round
vent fan, tighten fan on motor shaft by inserting long-blade
screwdriver through port in fan.
Fan is installed in its housing with bolts, and vibration can loosen these fasteners. Then tighten them with wrench.Step 4:
If fan has oil ports, apply several drops of 20-weight nondetergent
motor oil (not all-purpose oil) to each port at beginning of cooling
If you suspect fan motor is
faulty, test it with VOM set to RX1 scale. Disconnect terminal wires
from terminals, and clip probes of VOM to wires.
If meter reads
between about 3 and 30 ohms, motor is functioning properly. If meter
reads either zero or an extremely high number, replace motor.
remove the fan motor, remove the fan, the power wires, and several
mounting bolts. Install the new motor with the reverse procedure