If you hear a cluttering sound in your indoor air conditioner unit, you should investigate the issue. This sound comes when the evaporator coils get frozen and ice develops on their surface. This is not a good sign.
There are two reasons for this:
1-The airflow on evaporator coils is limited
2-Air conditioner is low on refrigerant
This causes the air conditioner to insufficiently cool the area. The cooling capacity drops down to a significant degree. The ice builds up on the evaporator coils when evaporator coils do not get enough warm air to get defreeze. In this case as the moisture in the air hits the refrigerant filled evaporator coils it freezes instantly, making a layer of ice on them. The reason or restricted air might be the reason of clogged filters, blower fan malfunction, dirty evaporator coils or broken air ducts.
- The mini split air conditioner should be turned off immediately.
- After sometime turn on the Fan setting and let it defreeze the ice on the coils.
- Check the air filters if you can clean them then get them clean or replace if the filters are dirty.
- Check the vents for any air restrictions.
- If the problem remains the same contact air conditioners repair company.
The refrigerant gas is the coolant that makes the air cold in the air conditioner. If the refrigerant gas leaks out then the refrigerant levels also drop down and result in developing ice on the evaporator coils. You can hear a hissing sound or smell the gas.
- Turn off the air conditioner immediately as your air conditioner will not provide adequate cooling now and without the regerigerant gas it will also damage the motor of your air conditioner.
- Turn on the ‘FAN’ function to start the defreeze function. But turn it off again after 15 minutes.
- If you suspect that refrigerant has been leaked then you have to contact the professional HVAC technician to solve this issue.