Goodman HVAC Error Code 27: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
27
Brand
Goodman
Product Type
hvac
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error code 27 on your Goodman HVAC system indicates that the reversing valve solenoid is open (electrically open circuit). This solenoid controls the reversing valve, which switches your heat pump between heating and cooling modes. When it fails, your system may not change modes or may run inefficiently.
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Tools You'll Need

How to Fix Error Code 27

  1. Turn Off Power to the Unit

    Hazardous voltage inside the unit. Always disconnect power before servicing.

  2. Locate the Reversing Valve and Solenoid

  3. Check Solenoid Wiring and Connections

  4. Test the Solenoid Coil Resistance

    Use a multimeter with appropriate safety rating for HVAC equipment.

  5. Check Control Voltage

    Live voltage present. Be careful not to short terminals.

  6. Replace the Solenoid Coil (if needed)

    Use a coil that matches your unit's specifications.

  7. Test Operation

Parts You May Need

Reversing valve solenoid coil
Check Price on Amazon
Reversing valve solenoid coil
Check Price on Amazon
Reversing valve solenoid coil
Check Price on Amazon
Reversing valve solenoid coil
Check Price on Amazon
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When to Call a Professional

If you've replaced the solenoid coil and the error persists, or if the reversing valve is physically stuck, call a licensed HVAC technician. Diagnosing refrigerant-related issues requires specialized training and equipment.

Frequently Asked Questions

What does error code 27 mean on a Goodman heat pump?
Error code 27 indicates an open circuit in the reversing valve solenoid coil, which prevents the heat pump from switching between heating and cooling modes.
Can I drive my Goodman heat pump with error code 27?
Yes, but it will be stuck in one mode (heating or cooling). For example, in winter it may only cool, which could damage the system. Should be repaired promptly.
How do I test the reversing valve solenoid on a Goodman unit?
Use a multimeter to check resistance across the solenoid terminals (should be 20-200 ohms) and check for 24VAC at the solenoid when the system calls for a mode change.
How much does it cost to fix error code 27 on a Goodman system?
DIY solenoid coil replacement costs $20-$50. If a technician replaces the entire reversing valve, costs range from $400-$800.
Can a thermostat cause error code 27?
Yes, a faulty thermostat or wiring can fail to send 24VAC to the solenoid, resulting in the error. Check thermostat signals before replacing the solenoid.

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