Heat Pump Not Working

Common Symptoms

You might be experiencing this problem if you notice any of these signs:

• No heating or cooling produced
• Won't switch between heating and cooling
• Stuck in one mode
• Ice buildup in winter heating mode
• Blowing cold air in heat mode
• Running constantly without results
• Strange sounds from outdoor unit
• Emergency heat running constantly

Step-by-Step Diagnosis

Follow these steps to identify the exact cause of your problem:

1. Verify thermostat is set correctly for season
2. Check if in emergency heat mode
3. Inspect outdoor unit for ice buildup
4. Listen for reversing valve click when switching modes
5. Check both outdoor and indoor units running
6. Verify sufficient airflow from vents
7. Look for error codes on thermostat
8. Check circuit breakers for both units
9. Note if problem is heating only or both modes
10. Verify outdoor temperature (may affect efficiency)
11. Check for blocked outdoor coils
12. Note if auxiliary heat is running constantly

Most Common Causes (Ranked by Likelihood)

DIY Solutions

Step-by-Step Instructions:

1. Check thermostat mode - ensure not on emergency heat
2. Replace air filter
3. Inspect outdoor unit for ice - turn off if iced
4. Clean outdoor coils with garden hose
5. Clear snow and debris from around unit
6. Raise outdoor unit if sitting in standing water
7. Switch between heat and cool modes to test
8. Listen for reversing valve click when switching
9. Check both breakers (indoor and outdoor)
10. Verify vents are open and unobstructed
11. Let unit defrost completely if iced (2-4 hours)
12. Test both heating and cooling modes after repairs

When to Call a Professional

Don't attempt DIY repairs if you experience any of these situations:

• Unit won't switch between modes after troubleshooting
• Ice forms repeatedly on outdoor unit
• No click from reversing valve when switching modes
• Refrigerant leak suspected (oil spots on lines)
• Emergency heat running all the time
• Loud grinding from outdoor unit
• Significant performance loss in cold weather
• Unit is more than 10 years old with recurring issues

Prevention Tips

Stop this problem before it starts with these preventive measures:

• Schedule maintenance twice yearly (spring and fall)
• Keep outdoor unit clear of snow and debris
• Replace filters monthly during heavy use
• Don't block outdoor airflow with shrubs
• Install outdoor unit on raised platform in flood-prone areas
• Test both heating and cooling modes seasonally
• Install programmable thermostat with heat pump settings