Carrier HVAC Error Code 50: How to Fix It
Medium 30-60 minutes Medium Severity
Verified June 2026
- Error Code
- 50
- Brand
- Carrier
- Product Type
- hvac
- Severity
- Medium
- DIY Difficulty
- Medium
- Estimated Fix Time
- 30-60 minutes
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Tools You'll Need
- Non-contact voltage tester
- Multimeter
- Screwdriver set
- Wire strippers
- Wire nuts or crimp connectors
How to Fix Error Code 50
-
Turn Off Power to the HVAC System
ELECTRIC SHOCK HAZARD: Always shut off power before servicing. High voltage can cause serious injury or death. -
Locate the Outdoor Temperature Sensor
-
Inspect the Sensor and Wiring
-
Test the Sensor with a Multimeter
-
Replace the Sensor if Short
Ensure replacement sensor matches the resistance curve of the original. -
Reassemble and Restore Power
Parts You May Need
Outdoor temperature sensor (thermistor)
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Wire nuts or crimp connectors
Check Price on Amazon
Outdoor temperature sensor (thermistor)
Check Price on Amazon
Wire nuts or crimp connectors
Check Price on Amazon
Outdoor temperature sensor (thermistor)
Check Price on Amazon
Wire nuts or crimp connectors
Check Price on Amazon
Outdoor temperature sensor (thermistor)
Check Price on Amazon
Wire nuts or crimp connectors
Check Price on Amazon
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When to Call a Professional
If replacing the sensor does not clear the error, or if you are uncomfortable working with high-voltage components, contact a qualified HVAC technician. The control board may need diagnosis and replacement.Frequently Asked Questions
What does Carrier HVAC error code 50 mean?
Carrier error code 50 indicates an outdoor temperature sensor short circuit. This sensor monitors the outdoor coil temperature for defrost and efficiency control.
Can I run my AC with error code 50?
It is not recommended. The system may run inefficiently or shut down. Continuing operation could cause further damage. Fix the issue promptly.
How do I test the outdoor temp sensor?
Disconnect the sensor and measure resistance with a multimeter. A healthy sensor typically reads around 10k ohms at 77°F. A short shows near 0 ohms.
Where is the outdoor temperature sensor located?
The sensor is usually clipped to the refrigerant tubing near the outdoor coil, inside the outdoor unit's service panel.
How much does it cost to replace a Carrier outdoor temp sensor?
A replacement sensor costs $10-$30. DIY replacement saves labor. A professional service call may cost $100-$200 plus parts.