If both condensation lines of your AC unit are dripping at once when the system is running, there could be several potential causes for this issue. Here are some possible reasons:
High humidity: High humidity levels can result in increased condensation, leading to both lines dripping simultaneously. This is a natural consequence of cooling the air in the presence of high moisture content.
Clogged condensate drain lines: If the condensate drain lines are blocked or clogged, the water may not be able to drain properly, causing both lines to overflow and drip. This could be due to dirt, debris, algae, or other obstructions in the lines.
Incorrect installation: An improper installation of the condensate drain lines might cause them to function ineffectively, leading to both lines dripping simultaneously.
Oversized AC unit: If your AC unit is too large for the space it is cooling, it may cool the air too quickly and not run long enough to properly drain the condensate. As a result, both lines could be dripping.
Faulty condensate pump: Some AC systems have a condensate pump that helps remove the water. If the pump is not working correctly, it could cause both lines to drip.
Frozen evaporator coil: If the evaporator coil inside the AC unit freezes due to airflow issues or low refrigerant levels, it can result in excessive condensation and lead to both lines dripping.
Malfunctioning float switch: The float switch is a safety feature that shuts off the AC system if the condensate drain pan overflows. If the float switch is faulty or stuck, it could cause both lines to drip.
Issues with the air handler: Problems with the air handler, such as a blocked or dirty coil, can lead to inefficient cooling and increased condensation, resulting in both lines dripping.
Refrigerant leak: A refrigerant leak can disrupt the normal cooling process and affect the temperature of the evaporator coil, leading to increased condensation.
AC unit malfunction: Various issues within the AC unit, such as sensor problems, electrical faults, or control board malfunctions, could disrupt the normal condensation process and cause both lines to drip.
Since the technicians are having difficulty figuring out the exact cause, it may be beneficial to consider getting a second opinion from a different HVAC professional or a specialized technician with experience in troubleshooting complex AC issues. They might be able to identify the problem and recommend the appropriate solution. Regular maintenance and cleaning of the AC system can also help prevent such issues in the future.