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Error code reference

Samsung Air Conditioner Error Code *9

Float switch error (wired remote controller; * = indoor unit address).

Samsung codesSamsung air conditioner codes

Float switch error (wired remote controller; * = indoor unit address).

First step from the service manual

Check drain pump, float switch, drain system, and DIP switch SW2/SW3 positions.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
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What *9 means on a Samsung air conditioner

The *9 error code on a Samsung air conditioner indicates a float switch error detected through the wired remote controller, where the asterisk represents the specific indoor unit address in a multi-unit installation. The float switch is a safety device mounted in the condensate drain pan that monitors water level. When condensate water accumulates beyond an acceptable level, the float switch activates and signals the unit to shut down, preventing water overflow and potential water damage to the surrounding structure or internal components.

This error is triggered when the indoor unit's control board receives a continuous high-water signal from the float switch circuit. The root causes generally fall into two categories: an actual drainage problem causing water to accumulate, or a fault in the float switch or its wiring that produces a false activation signal. Drainage issues include a blocked or kinked drain line, a failed drain pump, or an improperly sloped condensate system. A float switch that is stuck in the activated position, has failed internally, or has corroded contacts can also trigger this code without genuine water accumulation.

DIP switch settings on SW2 and SW3 are also part of the diagnostic process because these switches configure how the control board interprets signals related to the drain system and unit addressing. Incorrect DIP switch positions can cause the board to misread float switch status or create communication conflicts in multi-unit wired remote setups. Technicians should verify DIP switch configurations match the installation requirements for the specific unit address and drain pump configuration before replacing components.

Source: manufacturer service documentation.

Common causes of *9

  1. 01

    Blocked or clogged condensate drain line

    Wiring / connection

    Algae, debris, or sediment buildup in the drain line prevents condensate from flowing freely, causing water to back up into the drain pan and lift the float switch. Inspect the drain line for visible blockages and flush with water or a mild cleaning solution.

  2. 02

    Failed or seized drain pump

    Part replacement

    If the indoor unit relies on a condensate pump to remove water, a failed pump motor or impeller will cause water to accumulate rapidly in the drain pan. Test the pump for continuity and confirm it runs when supplied with the correct voltage.

  3. 03

    Faulty or stuck float switch

    Part replacement

    The float switch itself may be stuck in the raised position due to debris, corrosion, or mechanical failure, causing a false error signal even when the drain pan is dry. Check that the float moves freely and test the switch contacts for proper open and closed resistance values.

  4. 04

    Incorrect DIP switch SW2 or SW3 configuration

    Wiring / connection

    Improperly set DIP switches can cause the control board to misinterpret float switch signals or create addressing conflicts in a multi-unit wired remote system. Compare the current SW2 and SW3 positions against the configuration required for the specific installation and unit address.

  5. 05

    Improper condensate drain slope or drain pan issue

    Wiring / connection

    A drain line with insufficient slope, a sagging section, or an improperly leveled indoor unit can prevent gravity drainage and allow water to pool in the drain pan. Inspect the drain line routing and verify the unit is level or pitched correctly toward the drain outlet.

See the test procedure for each cause

Frequently asked questions about *9

What does *9 mean on a Samsung air conditioner?
The *9 code on a Samsung air conditioner is a float switch error reported through the wired remote controller, where the asterisk identifies the specific indoor unit address. It means the float switch in the condensate drain pan has detected a high water level and triggered a safety shutdown. The error can result from an actual drainage problem or from a faulty float switch producing a false signal. The drain pump, drain line, float switch, and DIP switch settings should all be inspected as part of diagnosis.
Can I fix the *9 error on my Samsung air conditioner myself?
Some causes of the *9 error are accessible to a knowledgeable DIYer, such as clearing a blocked drain line or checking that the float switch moves freely in the drain pan. However, testing the drain pump for electrical faults, verifying DIP switch configurations, and diagnosing wiring issues in a multi-unit system require familiarity with HVAC electrical components and safe handling practices. If you are not comfortable working with electrical components or accessing the indoor unit's control board, a qualified technician should perform the inspection.
Is the *9 error on a Samsung air conditioner dangerous?
The float switch error itself is a safety feature, not a hazard. It shuts the unit down to prevent condensate water from overflowing and causing water damage or potential mold growth. However, if the underlying drainage problem is left unaddressed, water can accumulate and eventually leak onto ceilings, walls, or electrical components. Addressing the root cause promptly reduces the risk of property damage.
How much does it cost to repair the *9 error on a Samsung air conditioner?
Repair costs vary depending on the root cause. Clearing a clogged drain line is typically inexpensive, often in the range of $75 to $200 for a service call including the cleaning. Replacing a failed drain pump or a defective float switch generally costs between $150 and $400 including parts and labor. If the issue involves wiring faults or control board problems in a complex multi-unit installation, costs could be higher depending on the extent of the repair.
Will resetting my Samsung air conditioner clear the *9 error code?
A power reset may temporarily clear the *9 error, but the code will return if the underlying problem has not been corrected. If the drain pan still contains standing water or the float switch is still stuck or faulty, the unit will detect the condition again and shut down. A reset should only be performed after the drain system has been inspected, the water level in the pan has been confirmed normal, and the float switch moves freely.

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