Over time, air conditioner filters accumulate significant dust buildup. This obstructs heat dissipation, preventing the unit from heating effectively. Additionally, prolonged use causes dust and debris to clog both internal and external vents. Without timely cleaning, airflow diminishes progressively, ultimately hindering heating performance.
Solutions
Regularly clean the air conditioner's filter and clear the vents to restore normal heating function, or consider replacing it with a model that allows for self-cleaning.
Damaged Capillary Tubes or Check Valves
The capillary tube network mimics the human capillary system, primarily consisting of tubes with outer diameters of 3.5mm-5mm, supplemented by water supply loops with 20mm outer diameters. The check valve prevents reverse oil flow; if air backflow occurs, it will cause the air conditioner to fail to heat.
Solution
Prompt replacement of the capillary tube or check valve is generally recommended to resolve the heating failure issue, offering a convenient and efficient solution.
Excessively Low Outdoor Temperature
If the outdoor temperature is too low, it can impair the air conditioner's normal operation. In such conditions, the indoor heating function may fail because the unit cannot defrost properly, thereby preventing heating.
Solution
In this case, manually remove the frost buildup on the air conditioner using tools. This will allow the unit to heat again. However, this operation is relatively complex, so it is recommended to have a professional perform it.
Leak in the Four-Way Valve
Close inspection reveals the four-way valve as a control valve with four oil ports. These control valves are essential components in the air conditioning system. If the four-way valve leaks, it will prevent the air conditioner from heating.
Solution
If inspection confirms the heating failure is caused by a leaking four-way valve, promptly replace the valve to resolve the issue.
Refrigerant Deficiency
A lack of refrigerant within the air conditioner not only prevents cooling but also impairs heating performance. Most modern air conditioners utilize heat pump heating technology, which relies on refrigerant evaporation for proper operation. Without sufficient refrigerant, the unit cannot absorb heat effectively and will fail to function normally.
Solution
Professional technicians must recharge the refrigerant to restore normal operation and provide maintenance protection for the unit.
Mismatched Air Conditioner Capacity and Room Size
Typically, 1 horsepower (HP) provides approximately 2000 BTU cooling capacity. To convert to watts (W), multiply by 1.162. Thus, 1 HP heating capacity equals 2000 BTU × 1.162 = 232W. Calculations show:while a 1.5-horsepower unit covers 10–18 square meters.
Solution
It is recommended to replace the unit with one whose capacity matches the room size, addressing the issue at its root.
Optimizing Heating Performance
While air conditioners can raise room temperatures, proper operation enhances heating efficiency. Set the temperature to 26°C and activate auxiliary heating for improved performance.