If your heat pump isn’t working properly, the problem is usually a thermostat issue, airflow restriction, electrical failure, or a component like the compressor or reversing valve.
Quick Answer
Common Heat Pump Problems
Start With These Quick Checks
Choose Your Problem
Full Troubleshooting Guide
When to Call a Pro
FAQs
Heat pumps are efficient systems that both heat and cool your home—but when something goes wrong, performance can drop quickly. Problems may show up as no heating, weak cooling, constant running, or unusual noises.
This page helps you quickly identify your issue and jump to the right solution.
Because heat pumps both heat and cool, some problems overlap with air conditioners. See Central AC Not Working.
Quick Answer
If your heat pump isn’t working, check the thermostat, power supply, and air filter first. If those are fine, the issue may involve airflow, refrigerant levels, or components like the compressor or reversing valve.
Bottom Line: Many heat pump problems are simple to fix, but persistent or complex issues usually require professional service.
Common Heat Pump Problems
| Problem | What’s Happening | See This Guide |
|---|---|---|
| Not turning on | No power or control issue | Heat Pump Not Turning On |
| Not heating | Low output or cold air | Heat Pump Not Heating |
| Not cooling | Reduced cooling capacity | Heat Pump Not Cooling |
| Running constantly | System can’t keep up | Heat Pump Running Constantly |
| Freezing up | Ice buildup on unit | Heat Pump Freezing Up |
| Making noise | Mechanical or airflow issue | Heat Pump Making Noise |
Start With These Quick Checks
These simple steps solve many heat pump problems.
- Make sure the thermostat is set correctly
- Check the circuit breaker and power supply
- Replace a dirty air filter
- Make sure vents are open and unobstructed
- Inspect the outdoor unit for debris
See:
Choose Your Problem
Select the issue that best matches what you’re seeing:
- No power or won’t start: Heat Pump Not Turning On
- Not heating properly: Heat Pump Not Heating
- Not cooling properly: Heat Pump Not Cooling
- Blowing cold air: Heat Pump Blowing Cold Air
- Short cycling: Heat Pump Short Cycling
- Running constantly: Heat Pump Running Constantly
- Freezing or ice buildup: Heat Pump Freezing Up
- Not defrosting: Heat Pump Not Defrosting
- Unusual noises: Heat Pump Making Noise
Full Troubleshooting Guide
For a step-by-step process to diagnose heat pump problems, see:
Heat Pump Troubleshooting Guide: Step-by-Step Fixes
This guide walks you through diagnosing issues based on symptoms, system behavior, and common causes.
When to Call a Pro
- The unit won’t turn on after basic checks
- The system isn’t heating or cooling properly
- You hear unusual noises
- You suspect refrigerant or compressor issues
- Problems persist after troubleshooting
If your heat pump problem involves electrical components, refrigerant, or repairs you’re not comfortable handling, it’s best to call a qualified HVAC technician.
Heat pumps contain high-voltage components and pressurized refrigerant systems that require specialized tools and training.
Find a trusted local heating & air conditioning contractor to diagnose and repair the issue safely.
FAQs
Why is my heat pump not working at all?
This is usually caused by a thermostat problem, power issue, or electrical component failure.
Why does my heat pump run but not heat?
This may be due to airflow problems, refrigerant issues, or a malfunctioning reversing valve.
Can a dirty filter cause heat pump problems?
Yes. It restricts airflow and reduces both heating and cooling performance.
Is it normal for a heat pump to struggle in cold weather?
Yes. Efficiency drops in very cold temperatures, and auxiliary heat may be required.
