Outside ac unit fan not running but inside is, what you can do?

🔍 Step-by-Step Troubleshooting Guide

1️⃣ Check the Thermostat Settings

Before diving into repairs, ensure:
✅ The thermostat is set to COOL mode.
✅ The temperature is set lower than room temperature.
✅ The fan setting is on AUTO (not just ON).
✅ Try resetting the thermostat by turning it OFF for 1-2 minutes, then ON again.

Outside ac unit fan not running but inside is

🚀 If the thermostat is fine, move to the next step.

2️⃣ Check the Circuit Breaker & Power Supply

Your outdoor AC unit has two power sources:
1️⃣ Main electrical panel (circuit breaker) – Check if the breaker for the AC has tripped.

If tripped: Turn it OFF, then back ON.
If it trips again immediately: There may be a short circuit—call an HVAC technician.

2️⃣ Outdoor disconnect switch – Open the small box near the outdoor unit and ensure the switch is ON.

🚀 If power is fine, move to the next step.

3️⃣ Manually Spin the Fan (Quick Test for a Bad Capacitor)

Take a stick or screwdriver (not your fingers!) and push the fan blades.
If the fan starts spinning but stops after a few seconds → The capacitor is likely bad.
If the fan won’t spin at all or feels stuck → The fan motor may be bad.

🚀 If the fan tries to start, move to step 4 (check the capacitor).

4️⃣ Check & Replace the Capacitor (Most Common Issue!)

The capacitor is a small, cylindrical part that helps start the fan and compressor. If it fails, the fan won’t run.

Signs of a Bad Capacitor

✔ Fan tries to start but fails (hums, then stops).
✔ The capacitor is bulging or leaking oil.
✔ AC works fine inside but the outdoor fan isn’t spinning.

How to Replace the Capacitor

⚠ Warning: Capacitors store high voltage—turn off power before handling!

1️⃣ Turn off power at the breaker box and disconnect switch.
2️⃣ Remove the outdoor unit panel (use a screwdriver).
3️⃣ Locate the capacitor (a metal cylinder with wires).
4️⃣ Look for bulging, leaks, or burn marks.
5️⃣ Use a multimeter to test capacitance (if you have one).
6️⃣ Replace with a capacitor of the same µF rating (found on the label).

🚀 If replacing the capacitor doesn’t fix it, move to step 5 (check the contactor).

5️⃣ Check & Replace the Contactor (Power Relay Switch)

The contactor is a switch that sends power to the compressor and fan. If it’s faulty, the fan won’t run.

Signs of a Bad Contactor

✔ Clicking noise, but nothing happens.
✔ The fan starts only if you manually press the contactor.
✔ The contactor is burnt or pitted (visible damage).

How to Replace the Contactor

1️⃣ Turn off power at the breaker and disconnect switch.
2️⃣ Locate the contactor (a small black/brown box with wiring).
3️⃣ Check for burnt or corroded contacts.
4️⃣ If faulty, replace it with an identical model.

🚀 If the contactor is fine but the fan still won’t run, move to step 6 (check the fan motor).

6️⃣ Check the Fan Motor (If Everything Else is Fine)

If the capacitor and contactor are fine, the fan motor may have failed.

Signs of a Bad Fan Motor

✔ Fan won’t spin even with a push.
✔ Buzzing sound but no movement.
✔ The motor feels very hot.
✔ The fan moves very stiffly or is stuck.

How to Fix

If the motor is stuck or stiff, it may need lubrication.
If the motor doesn’t respond at all, it likely needs replacement.
Check if the motor is getting power using a multimeter.

🚀 If the motor is bad, it needs to be replaced (step 7).

7️⃣ Check for a Refrigerant Leak (Low-Pressure Switch)

Some AC units shut down the fan if refrigerant levels are too low.
Look for ice buildup on the refrigerant lines or hissing sounds (leak).
Solution: Call a licensed HVAC technician to check refrigerant levels and repair leaks.

🔎 Summary: Why Your Outdoor AC Fan Won’t Run

Possible Issue	Signs	Fix
Bad capacitor	Fan hums but doesn’t spin, works if pushed	Replace capacitor
Bad contactor	Clicking noise, no power to fan	Replace contactor
Tripped breaker	No power to unit	Reset breaker
Blown fuse in disconnect box	No power	Replace fuse
Fan motor failure	Fan won’t spin, overheating	Replace fan motor
Low refrigerant	Ice on lines, hissing sound	Call technician

💡 Final Advice

🔹 Start with easy fixes (power check, manually spin the fan).
🔹 If the fan moves but doesn’t start, replace the capacitor (common issue).
🔹 If power is fine but nothing works, check the contactor and motor.
🔹 If the compressor is running but the fan isn’t, replace the fan motor.
🔹 If refrigerant is low, call a technician.

Would you like step-by-step guidance on replacing a capacitor or fan motor? 😊

If your inside unit (air handler) is running, but the outdoor AC unit’s fan is not spinning, it usually indicates a power issue, bad capacitor, faulty contactor, or a failed fan motor. Follow these step-by-step troubleshooting steps to fix it.