Carrier HVAC Error Code 33: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
33
Brand
Carrier
Product Type
hvac
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Carrier HVAC error code 33 means a limit circuit fault, usually caused by a tripped high-limit switch, dirty air filter, or restricted airflow. This safety feature shuts down the system to prevent overheating.
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Tools You'll Need

How to Fix Error Code 33

  1. Turn Off Power

    Always turn off power before inspecting or servicing HVAC equipment.

  2. Check and Replace Air Filter

  3. Inspect Return and Supply Vents

  4. Check Blower Motor and Fan

    Be careful of sharp edges on the blower wheel.

  5. Reset High-Limit Switch

    If the switch trips again immediately, call a professional.

  6. Inspect Ductwork

Parts You May Need

Air filter
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Manual-reset high-limit switch
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Air filter
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Manual-reset high-limit switch
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Air filter
Check Price on Amazon
Manual-reset high-limit switch
Check Price on Amazon
Air filter
Check Price on Amazon
Manual-reset high-limit switch
Check Price on Amazon
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When to Call a Professional

If the error persists after checking airflow and resetting the switch, or if the switch trips repeatedly, call a professional HVAC technician. There may be a faulty high-limit switch, heat exchanger issue, or ductwork problem requiring specialized tools.

Frequently Asked Questions

What causes Carrier HVAC error code 33?
Error code 33 is triggered when the limit circuit opens due to overheating, often from a dirty filter, blocked vents, or a failing blower motor.
How do I reset Carrier HVAC error code 33?
Turn off power, fix the underlying airflow issue, then locate the manual-reset high-limit switch and press its reset button. Restore power and test.
Can I still use my HVAC with error code 33?
No, the system shuts down as a safety precaution. Continued operation without fixing the cause can damage components.
How much does it cost to fix Carrier error code 33?
DIY fixes like replacing an air filter cost under $20. Professional service for a blower motor or switch repair ranges from $200 to $500.
Is error code 33 dangerous?
It indicates overheating, which can lead to fire or system damage. It should be addressed promptly.

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