Heat Pump Services

Is Your Heat Pump Failing to Keep Up With the Weather?

Is your heat pump stuck in one mode, covered in a block of solid ice, or constantly relying on expensive auxiliary heat to keep your home warm? Because a heat pump is responsible for both heating and cooling your home, a malfunction doesn’t just affect one season—it threatens your year-round comfort. When a heat pump begins to struggle, it is a clear indicator that the delicate balance of refrigerant, airflow, and electrical controls has been compromised.

Unlike traditional air conditioners and furnaces, heat pumps operate continuously throughout the year, meaning they accumulate wear and tear much faster. When a component fails, it forces the compressor to work under extreme stress, dramatically increasing your energy bills while failing to maintain a comfortable indoor temperature. Addressing these performance drops early is critical to preventing the failure of the compressor, the most expensive component in the system.

At Mackey Services, we specialize in the unique mechanical demands of heat pump systems. We diagnose and resolve complex reversing valve, defrost cycle, and refrigerant issues with precision. Our goal is to uncover the root cause of the failure and restore your system to peak efficiency so you can rely on it in any weather.

Warning Signs Your Heat Pump Needs Professional Attention

Stuck in One Mode (Heating or Cooling)

The defining feature of a heat pump is its ability to switch between heating and cooling by reversing the flow of refrigerant. If your thermostat is set to heat but the vents are blowing freezing air—or vice versa—the system has lost its ability to switch modes. This issue renders the system useless for the current season and requires immediate professional intervention.

This symptom almost always points to a mechanical or electrical failure at the reversing valve or the control board. Forcing the system to run while stuck in the wrong mode will not resolve the issue and will only waste electricity while making your home increasingly uncomfortable.

The Outdoor Unit is Frozen Over

While it is completely normal for a thin layer of frost to form on the outdoor coils during the winter, a heat pump encased in a solid block of ice is a major red flag. Heat pumps are equipped with a defrost cycle designed to melt away light frost. If the unit resembles an iceberg, that cycle has failed, or airflow has been severely restricted.

A severely iced-over unit cannot extract heat from the outside air, meaning it will rely entirely on emergency strip heating to warm your home. Running a frozen heat pump can also permanently damage the fan blades and crush the delicate aluminum fins on the coil.

Auxiliary Heat Runs Constantly

Heat pumps are equipped with backup electric resistance heaters, known as auxiliary or emergency heat, to help out when temperatures drop near freezing. However, if your thermostat indicates that the auxiliary heat is running constantly during mild weather, your heat pump is failing to generate heat efficiently on its own.

Electric resistance heating is significantly more expensive to operate than the heat pump's standard compressor cycle. If the auxiliary heat runs continuously, your next utility bill will be shockingly high. This requires professional diagnostics to determine why the primary heating cycle is underperforming.

Strange Noises: Grinding, Hissing, or Clanking

A healthy heat pump operates with a steady, rhythmic hum, accompanied by a brief "whoosh" sound when the reversing valve shifts. If you begin to hear loud grinding, aggressive clanking, or high-pitched hissing, mechanical components are failing. Grinding often points to motor bearing failure, while clanking indicates loose internal hardware.

A loud hissing or bubbling sound usually indicates a severe refrigerant leak. Ignoring these noises is a guaranteed path to a total system breakdown. Addressing strange sounds early can often save expensive components from tearing themselves apart.

Short-Cycling and Inefficient Operation

Short-cycling occurs when the heat pump turns on, runs for a very brief period, and abruptly shuts off before the home reaches the target temperature. Because heat pumps are designed to run long, slow, efficient cycles, rapid starting and stopping places immense mechanical and electrical strain on the compressor.

Short-cycling prevents the system from properly dehumidifying the air in the summer and fails to heat the home evenly in the winter. It also causes a massive spike in energy consumption, as the system draws the most power during the initial startup phase.

Common Causes of Heat Pump System Failures

Reversing Valve Malfunctions

The reversing valve is the mechanical heart of the heat pump, responsible for changing the direction of the refrigerant to switch between heating and cooling. This valve relies on an electrical solenoid to shift a sliding mechanism inside the brass housing. Over time, the solenoid can burn out, or the internal slide can become mechanically stuck due to debris or wear.

When the reversing valve fails, the system will be locked in one mode. Diagnosing a reversing valve issue requires specialized tools to determine whether the failure is electrical (the solenoid) or mechanical (the valve body itself).

Defrost Cycle Failures

To clear normal winter frost from the outdoor coil, the heat pump temporarily switches back into cooling mode, sending hot refrigerant outdoors to melt the ice while using auxiliary heat to keep the house warm. This process is controlled by a defrost control board and specialized temperature sensors.

If the sensors fail, the control board malfunctions, or the reversing valve gets stuck, the defrost cycle will not activate. The result is a rapidly accumulating block of ice that completely suffocates the outdoor unit and halts the heating process.

Refrigerant Leaks and Pressure Issues

Heat pumps rely on a precise charge of refrigerant to absorb and release heat. Because they operate year-round at varying pressures, they are particularly susceptible to developing microscopic leaks in the copper lines or coils. A low refrigerant charge will cause the system to blow warm air in the summer and cool air in the winter.

Adding refrigerant without locating and sealing the leak is a temporary, unethical, and harmful practice. A proper repair involves electronic leak detection, brazing the leak, and recharging the system to factory specifications.

Electrical and Compressor Issues

Because heat pumps run continuously for most of the year, their electrical components degrade faster than those in standard air conditioners. Capacitors, which provide the starting jolt for the motors, frequently fail and leave the compressor humming loudly but unable to start. Contactors can become pitted and burned, interrupting the flow of electricity.

If electrical issues are ignored, they force the compressor to draw excessive amperage, leading to overheating and premature failure. Replacing degraded electrical components early is the best way to protect the life of the compressor.

Dirty Coils and Airflow Restrictions

A heat pump must have unimpeded airflow across both the indoor and outdoor coils to function properly. A severely clogged indoor air filter will restrict airflow, causing the indoor coil to freeze in the summer and overheat in the winter.

Similarly, if the outdoor condenser coil is blanketed in dirt, leaves, or lawn clippings, it cannot effectively release heat in the summer or absorb heat in the winter. Regular professional cleaning of both coils is essential for maintaining the efficiency and longevity of the system.

What to Expect During Heat Pump Service

When you call Mackey Services for heat pump issues, you can expect a comprehensive and highly technical diagnostic approach. Heat pumps are complex systems that require specialized knowledge to troubleshoot effectively. We don't guess; we use advanced meters and gauges to measure electrical draw, refrigerant pressures, and temperature differentials across both coils.

Once our diagnostic process is complete, we present our findings to you in clear, understandable terms. We explain exactly what component has failed, why the failure occurred, and what steps are necessary to resolve it. You will receive clear, upfront pricing before any repair work begins, ensuring you are fully informed and in control of the process.

Our technicians arrive in fully stocked vehicles equipped with the specialized parts required for heat pump repairs. We respect your home by utilizing shoe covers and drop cloths, ensuring that your property is treated with the highest level of care.

The Repair vs. Replacement Decision

Because heat pumps run year-round, a 10-year-old heat pump has accumulated the equivalent wear and tear of a 20-year-old standalone air conditioner. If your system is aging, requires frequent repairs, or has suffered a major compressor failure, replacement is often the most financially responsible choice.

If we determine that a replacement is the best option, we provide a pressure-free consultation to discuss modern, high-efficiency heat pump technology. We help you understand SEER and HSPF ratings, ensuring you select a system that meets your comfort needs and budget.

Our Approach to Heat Pump Excellence

Mackey Services is built on a foundation of integrity, transparency, and superior technical skill. We understand that a failing heat pump disrupts your life, which is why we focus on delivering rapid, reliable solutions that stand the test of time. We do not rely on aggressive sales tactics; our recommendations are based solely on what is best for the health of your HVAC system.

We stand behind our work with solid guarantees because we believe that doing the job right the first time is the only acceptable standard. (Hypothesis: We offer comprehensive warranties on all heat pump parts and labor to give you total peace of mind.)

HVAC emergencies don't stick to a convenient schedule. When your heat pump fails during extreme weather, you need a responsive team. (Hypothesis: Our 24/7 emergency service ensures that you have access to expert support exactly when you need it.) We also believe that major repairs should not cause financial distress. (Hypothesis: We offer flexible financing options to make major heat pump repairs and replacements accessible for any budget.)

Our Heat Pump Services

• Heat Pump Repair
• Heat Pump Installation
• Heat Pump Maintenance

Related Services to Support Your HVAC System

Your heat pump is the core of your indoor comfort, but it works in tandem with other systems to create a healthy living environment. We offer comprehensive solutions to support your entire home.

Air Conditioning Services

While heat pumps handle both heating and cooling, we also service traditional central air conditioning systems. If you have a split system or multiple units handling different zones of your home, we provide expert care for all traditional cooling equipment.

Heating Services

For homes utilizing dual-fuel systems—where a heat pump is paired with a gas furnace for extreme cold—we provide comprehensive heating services. We ensure both systems communicate flawlessly and operate at peak efficiency.

Indoor Air Quality (IAQ)

Because heat pumps circulate air year-round, they also circulate dust, allergens, and airborne pathogens. Our IAQ solutions, including whole-house air purifiers, advanced filtration, and UV light systems, work seamlessly with your heat pump to ensure the air you breathe is as clean as it is comfortable.

Contact us today to schedule your service.