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Why Is My Split System Not Heating Properly?

Before the introduction of modern air conditioners, people relied on conventional heating and cooling units to keep the indoors comfortable. These traditional heating systems relied on various methods, such as furnaces, boilers, or electric resistance heaters, to generate heat. Furnaces burned fuel, typically oil or gas, to produce heat, which was then distributed through ductwork or radiators. Boilers heated water, which was circulated through pipes to radiators or underfloor heating systems.

Electric resistance heaters directly converted electricity into heat. While these conventional heating units were effective in their own right, they lacked the versatility and energy efficiency of modern reverse-cycle air conditioners. The arrival of reverse-cycle air conditioners revolutionized the heating & cooling industry by offering the convenience of both heating and cooling functions in a single unit, providing users with greater control and year-round comfort. Before we delve deeper into the article, let’s first learn more about the pros and cons of the Reverse Cycle Air Conditioners:


Reverse Cycle Air Conditioners offer the following benefits:

Heating and Cooling: One of the biggest advantages of reverse cycle air conditioners is their ability to provide both heating and cooling functions in a single unit. This versatility allows for year-round comfort, eliminating the need for separate heating and cooling systems.

Energy Efficiency: Reverse cycle air conditioners are known for their energy efficiency. Instead of generating heat or cool air, they transfer heat from one place to another, making them more energy-efficient compared to traditional heating or cooling systems. This can result in significant energy savings and lower utility bills.

Climate Control: These systems offer precise temperature control, allowing you to set and maintain your desired indoor temperature consistently. Many models also include programmable timers and zoning options, enabling you to tailor the temperature in different areas of your home for personalized comfort.

Air Quality: Reverse cycle air conditioners often include air filtration systems that help improve indoor air quality. These filters trap dust, allergens, and other pollutants, resulting in cleaner and healthier air for you and your family.


With all the amazing benefits, reverse cycle air conditioners also have a few disadvantages that should be considered:

Upfront Cost: Reverse cycle air conditioners tend to have a higher initial cost compared to conventional heating or cooling systems. The advanced technology and features they offer contribute to their higher price point. However, the long-term energy savings can offset the initial investment.

Space Requirements: Reverse cycle air conditioners consist of both indoor and outdoor units, which can take up valuable space on your property.

Maintenance and Repairs: Like any other HVAC system, reverse cycle air conditioners require regular maintenance to ensure optimal performance. Filters need to be cleaned or replaced, and the system may require professional servicing to address any issues that arise. These maintenance tasks and potential repairs should be considered when budgeting for the system’s ongoing costs.

Overall, the advantages of reverse-cycle air conditioners outweigh the disadvantages, making them a highly favourable choice for efficient heating and cooling solutions. A reliable split system is essential for maintaining a comfortable indoor environment, providing both cooling and heating functions. However, there are instances when the heating function of your split system may not work as expected, leaving you feeling frustrated and cold.

Why Is My Split System Not Heating Properly?

In this comprehensive troubleshooting guide, we will explore common causes behind split system heating issues. By understanding these potential problems, you can troubleshoot and resolve them effectively. However, it is highly advised that you seek professional assistance if your reverse-cycle air conditioner runs into any issues. DGB Refrigeration Heating & Cooling has been serving the residents of Melbourne for the last 15 years. You can reach out to us for all your heating & cooling needs by dialling 03 7038 6918.

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Understanding Split System Heating

Reverse Cycle split systems are designed to offer both cooling and heating capabilities, making them versatile solutions for year-round comfort. The heating mode in a split system works by reversing the refrigeration cycle. Instead of removing heat from the indoor air and expelling it outside (as in cooling mode), the system absorbs heat from the outside air and transfers it indoors to warm the space. It’s important to note that split systems don’t generate heat; they extract it from the environment.

Common Signs of Heating Problems

Some of the common signs of heating problems include the following:

  1. Insufficient Heat Output: The most apparent sign of a heating issue is when your split system fails to deliver warm air despite being in heating mode. If you’re still feeling cold after the system has been running for a while, it indicates that there is a problem that needs to be addressed.
  2. Uneven Heating: If some areas of your space receive adequate heating while others remain cold, it suggests an airflow or distribution problem. Inconsistent heating can be caused by issues with the indoor unit, such as a faulty fan or blocked vents.
  3. Unusual Noises: Unusual sounds emanating from your split system during heating operation, such as grinding, rattling, or squealing noises, may indicate mechanical issues. These noises should not be ignored, as they can signify problems with the blower motor, fan, or other components.

Troubleshooting Common Heating Issues

Ice Build-Up and Restricted Airflow: In reverse cycle air conditioning systems, ice build-up can hinder the heating function of the system. When the outdoor unit becomes too cold during winter, ice can form and obstruct the airflow necessary for efficient heating. Lack of proper ventilation, neglecting regular servicing, or an aging system can contribute to this issue. The expansion of ice can damage components and lead to refrigerant leaks, affecting overall heating performance. Ensure proper ventilation, schedule regular maintenance, and promptly address any ice build-up or refrigerant leaks by contacting a professional technician from DGB Refrigeration Heating & Cooling.

Clogged Filters and Coils: Clogged filters and coils are another major reason that can cause your split system to deliver insufficient heat. Blocked filters restrict airflow, strain the compressor, and may lead to premature system failure. Regularly clean or replace air filters as recommended, usually once a year, to ensure proper air flow and efficient heating. Additionally, have the evaporator and condenser coils cleaned annually by a professional technician by DGB Refrigeration Heating & Cooling to prevent heating issues caused by dirty coils.

Circuit Breaker and Fuse Malfunctions: Electrical issues can impact the heating function of your split system. Tripped circuit breakers or defective fuses can disrupt the power supply, resulting in poor heating performance or a complete failure. Check the circuit breaker associated with the unit and reset it if necessary. If the problem persists, reach out to us at DGB Refrigeration Heating & Cooling to investigate and resolve any electrical faults to restore proper heating operation by dialling 03 7038 6918.

Incorrect Settings and Thermostat Malfunctions: Sometimes, the heating problem may stem from incorrect settings of thermostat. Ensure that the system is set to the appropriate heating mode and the desired temperature. Incorrectly set thermostats can cause the split system to blow cool air instead of warm air. If you are uncertain about the settings or suspect a thermostat malfunction, consider contacting an HVAC technician at DGB Refrigeration Heating & Cooling, who can inspect and recalibrate the thermostat or provide guidance on adjusting the settings correctly.

When to Seek Professional Help

While some split system heating issues can be resolved through basic troubleshooting, there are situations where professional assistance is necessary. Here are some scenarios when it’s best to contact a qualified technician:

  1. Persistent heating problems despite troubleshooting efforts
  2. Refrigerant leaks or ice build-up
  3. Unusual noises or vibrations from the system
  4. Electrical issues or tripped circuit breakers
  5. Complex mechanical problems or component failures


When your split system fails to deliver the expected heating performance, it can disrupt your comfort during colder months. By understanding the common causes outlined above, such as ice build-up, clogged filters and coils, circuit breaker issues, and incorrect settings, you can troubleshoot and address these problems effectively. However, for complex issues or if you are unsure about the reason behind the failure of your unit, it is always recommended to seek professional assistance. Contact DGB Refrigeration Heating & Cooling today by dialling 03 7038 6918 for expert service and repairs to restore the heating function of your split system efficiently.

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Contact Us And Talk With Experts

Contact Us Now!


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