Samsung Air Conditioner Error Code E602

E602 indicates a second-stage detection of the floating switch in the indoor unit drain pump system, meaning the control board has confirmed a persistent elevated water level in the condensate drain pan. The unit is signaling that water is not draining correctly and has not recovered after the initial detection event. This is a protective shutdown to prevent overflow and water damage.

No, it is not advisable to continue running the unit while E602 is active. The error indicates water is accumulating in the drain pan, and continued operation risks overflow, water damage to ceilings or walls, and potential mold growth. The unit may restrict or shut down operation automatically, but the underlying drainage issue should be resolved before resuming normal use.

A reset may temporarily clear the displayed error code, but because E602 is a second-stage persistent detection, the fault will return if the underlying drainage problem is not corrected. The control board will re-trigger the float switch fault the next time condensate water builds up in the pan. Resetting without repairing the cause is not a reliable fix.

Some causes of E602, such as a clogged drain line or debris in the drain pan, can be addressed by a knowledgeable DIYer who is comfortable accessing the indoor cassette unit. However, diagnosing the float switch resistance, testing pump voltage, and inspecting internal wiring requires basic electrical knowledge and a multimeter. If you are not comfortable working with electrical components, a qualified HVAC technician is recommended.

Repair costs vary depending on the root cause. A simple drain line cleaning or pan flush is typically a low-cost service call in the range of $75 to $200. Replacing a faulty float switch generally falls in the range of $100 to $300 including parts and labor. A full drain pump replacement on a cassette unit can cost between $200 and $500 or more depending on the unit model and local labor rates.