LG Heat Pump Error Code P801

P801 indicates a float switch detection error on an LG heat pump indoor unit. The float switch is a sensor in the condensate drain pan that monitors water levels. This code is classified as low-level risk, meaning the indoor unit continues to operate normally. It is an early warning that drainage or the float switch circuit should be inspected.

Because P801 is classified as a low-level risk event, the system is designed to continue operating normally when this code appears. However, if the underlying drainage issue is not corrected, continued operation can lead to water overflowing the drain pan and causing water damage. It is advisable to investigate and resolve the cause promptly rather than ignoring the alert.

Repair costs vary depending on the cause. Drain line cleaning is typically the least expensive repair, often ranging from $75 to $200 for a service call. Replacing a faulty float switch generally costs between $100 and $300 including parts and labor. Wiring repairs or control board diagnostics can increase costs depending on the extent of the fault found.

Some causes of P801 are owner-serviceable, particularly a clogged drain line. You can inspect and flush the condensate drain line to clear blockages, which is a common cause of this code. However, testing or replacing the float switch and diagnosing wiring faults typically requires a qualified technician with appropriate tools.

A power reset may temporarily clear the P801 code from the display, but it will return if the underlying cause is not addressed. If the drain line is blocked or the float switch is faulty, those conditions will persist and retrigger the alert. Resolving the root cause is necessary for the code to stay clear.