Eleven Common Issues Affecting HVAC Systems

January 15, 2015


Modern HVAC systems are highly dependable, but this does not mean that things will never go wrong.

hvac issues

An HVAC system may have some problems. A number of these issues can be easily fixed by the homeowner, but for complicated problems, the services of a St. Louis HVAC professional may be required.

1. Busted Fuse

Fuses ensure the compressor or motor of the unit does not get overheated. The breaker is the first thing HVAC professionals check when the motor stops functioning.

2. Damaged Contactor

Three contactors are present in an HVAC unit, one each for the blower motor, condenser fan motor and compressor. It is important that whenever the system is switched on, an electrical connection is established by engaging and starting the motors and compressor. When pitting and arcing form on the contactor, it may not conduct electricity and will prevent the motor from starting.

3. Capacitors

Start capacitors provide a starting torque for the compressor while run capacitors ensure a consistent speed when the unit motors are running. It is necessary to replace the capacitor when one of them becomes damaged to ensure the HVAC unit will function properly.

4. Gas valve

The gas valve regulates the flow of gas into the unit through the gas line. Whenever the gas valve is corroded, it is necessary to replace it.

5. Filters

Whenever filters become dirty and clogged, it is necessary to replace them. The best way to know whether filters need replacement is by simply holding them against the light. If light cannot pass through, it means the filter needs to be replaced. Air flow decreases when the filter is dirty and it ultimately causes freezing in the unit.

6. Thermostat

The thermostat provides instructions to the HVAC system. It is necessary to ensure the thermostat is functioning properly before an HVAC professional is called in. There are times when the HVAC system does not function properly because the setting on the thermostat is wrong or it is turned off.

7. Drain lines

Drain lines normally get clogged with algae or dirt. The drain pan will become filled when the drain is clogged, which causes water damage.

8. Refrigerant leak

The vibration caused by the unit may result in refrigerant leaks. Refrigerant leaks in the evaporator coil or condenser are irreparable. For leaks in other areas, the HVAC company will need to remove the remaining refrigerant and charge the unit to ensure the unit returns back to its normal function.

9. Compressor

The compressor is the main component of an air conditioner. It is necessary to have an appropriate amount of refrigerant in the unit to ensure it is functioning properly. The compressor may overheat if the unit lacks refrigerant. It may also become filled with liquid refrigerant if it is overcharged and results in liquid slugging.

10. Condenser Coil

It is necessary to regularly clean the condenser coil since they are positioned outside and are exposed to the elements. While it can be cleaned using a water hose, an HVAC professional may be necessary when it becomes too dirty to be cleaned with a hose.

11. Evaporator Coil

Evaporator coils can be integrated into the unit or it can be positioned in a separate room. An HVAC professional should be called to fix any noticeable damage on the evaporator coil.

Call Scott-Lee Heating Company at (314) 200-0788 if you are experiencing problems with your HVAC system.