Goodman HVAC Error Code 28: How to Fix It

Medium 1-2 hours Medium Severity Verified June 2026
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Error Code
28
Brand
Goodman
Product Type
hvac
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
1-2 hours
Error code 28 on a Goodman HVAC system indicates a crankcase heater fault. The crankcase heater keeps the compressor warm during off cycles to prevent refrigerant migration and liquid slugging. This error typically means the heater or its circuit has failed. Fixing it quickly is important to avoid compressor damage.
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Tools You'll Need

How to Fix Error Code 28

  1. Turn Off Power to the System

    Ensure the unit is completely de-energized. Failure to do so can cause electric shock or death.

  2. Locate the Crankcase Heater

  3. Inspect the Heater Wiring and Connections

  4. Test the Crankcase Heater for Continuity

  5. Test the Supply Voltage to the Heater

    Perform this step only if you are comfortable working with live circuits. Use insulated tools and follow safety protocols.

  6. Replace the Crankcase Heater (If Faulty)

  7. Restore Power and Test Operation

Parts You May Need

Crankcase Heater
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Crankcase Heater
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Crankcase Heater
Check Price on Amazon
Crankcase Heater
Check Price on Amazon
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When to Call a Professional

Call a professional HVAC technician if you are not comfortable working with high voltage, if the error persists after replacing the heater, or if you suspect a control board issue. A pro can accurately diagnose and repair complex electrical faults.

Frequently Asked Questions

What does error code 28 mean on a Goodman HVAC system?
It indicates a crankcase heater fault. The crankcase heater is not operating properly, which can lead to compressor damage.
Can I continue to run my Goodman system with error code 28?
It is not recommended. Running without a functioning crankcase heater may cause liquid refrigerant to accumulate in the compressor, leading to slugging and premature compressor failure.
How much does it cost to fix error code 28?
DIY replacement of a crankcase heater typically costs $50–$150 for the part. Professional repair may range from $200–$500 depending on labor and parts.
Where is the crankcase heater located?
It is usually wrapped around the bottom of the compressor or inserted into a well on the compressor body inside the outdoor unit.
How long does a crankcase heater last?
Crankcase heaters can last many years, but they can fail due to electrical surges, corrosion, or simply age. Regular maintenance can help extend their life.

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