LG Heat Pump Error Code E153

E153 means the indoor unit float switch has been detected in the open position for longer than one minute. The float switch is a water-level safety sensor in the condensate drain pan. When water accumulates and lifts the float for more than 60 seconds, the system logs E153 and shuts down to prevent water damage. The fault points to either a drainage system problem or a failed float switch circuit.

No, you should not continue operating the heat pump while E153 is active. The error indicates water may be accumulating inside the unit, which can overflow the drain pan and cause water damage to ceilings, walls, or flooring. The system shuts down specifically to prevent this damage, and bypassing or ignoring the fault risks significant property damage and potential mold growth.

Repair costs vary depending on the cause. Clearing a blocked condensate drain line is generally the least expensive fix, often in the range of $75 to $200 for a service call. Replacing a failed drain pump typically costs between $150 and $400 including parts and labor. Replacing a faulty float switch is usually less expensive than a pump, commonly in the $100 to $250 range. Wiring repairs or control board involvement can increase costs further.

Some causes, such as a clogged condensate drain line or an improperly pitched drain pipe, can be addressed by a knowledgeable homeowner. However, testing float switch resistance, confirming AC220V at pump terminals, and replacing a drain pump or control components are tasks that require electrical knowledge and appropriate safety precautions. If you are not comfortable working with AC voltage or diagnosing electrical components, a qualified HVAC technician should perform the repair.

A reset may temporarily clear the displayed code, but the fault will return quickly if the underlying problem is not resolved. If water is still accumulating in the drain pan, or if the float switch or its wiring is faulty, the switch will open again within a minute and trigger E153 again. Always identify and correct the root cause before relying on a reset.