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Error code reference

Samsung Air Conditioner Error Code E135

Indoor clean fan rotational frequency feedback error

Samsung codesSamsung air conditioner codes

Indoor clean fan rotational frequency feedback error - RPM values not sent as feedback to MICOM.

First step from the service manual

Check the feedback connection line and the rotational output of the clean fan motor.

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

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What E135 means on a Samsung air conditioner

Error code E135 on a Samsung air conditioner indicates an indoor clean fan rotational frequency feedback error. Specifically, the MICOM (microcomputer control board) is not receiving RPM feedback signals from the clean fan motor. The clean fan is a secondary fan found in certain Samsung indoor units, responsible for air circulation through a filtration or purification stage. The motor driving this fan is equipped with a Hall sensor or pulse generator that sends rotational speed data back to the MICOM so it can confirm the fan is spinning at the correct frequency. When that feedback signal is absent or outside expected parameters, E135 is triggered.

The most likely point of failure is the feedback connection line between the clean fan motor and the control board. This wiring harness carries the low-voltage signal pulses that represent motor RPM. A broken wire, loose connector pin, corroded terminal, or damaged harness at any point along this line will interrupt the signal and cause the error. Beyond wiring, the clean fan motor itself may be at fault. If the motor's internal sensor has failed, or if the motor is mechanically seized or intermittently stalling, it will not generate valid rotational output for the MICOM to read.

Diagnosis should begin by inspecting the feedback connection line for physical damage, loose connections, and continuity. The rotational output of the clean fan motor should also be tested directly to determine whether the motor is spinning freely and generating a proper signal. If the wiring is intact and connections are secure, the clean fan motor assembly is the likely replacement candidate.

Source: manufacturer service documentation.

Common causes of E135

  1. 01

    Loose or disconnected feedback wiring connector

    Wiring / connection

    The connector carrying RPM signal data from the clean fan motor to the MICOM may have worked loose over time due to vibration. Inspect all connectors along the feedback line for proper seating and secure fit.

  2. 02

    Damaged or broken feedback signal wire

    Wiring / connection

    A wire in the feedback harness between the clean fan motor and the control board may be broken, pinched, or shorted. Check the harness along its entire length for visible damage and test for continuity.

  3. 03

    Failed clean fan motor internal sensor

    Part replacement

    The clean fan motor contains an internal Hall effect sensor or pulse generator that produces the RPM feedback signal. If this sensor has failed, no signal will reach the MICOM even if the motor is spinning. Motor replacement is required in this case.

  4. 04

    Mechanically seized or stalled clean fan motor

    Part replacement

    If the clean fan motor is physically unable to rotate due to a mechanical obstruction, bearing failure, or winding fault, it will produce no rotational output signal. Check that the fan blade spins freely by hand with power disconnected.

  5. 05

    Faulty MICOM or control board

    Part replacement

    In rare cases, the control board itself may have a damaged input circuit that cannot read an otherwise valid feedback signal. This should only be considered after the wiring and motor have been ruled out as causes.

See the test procedure for each cause

Frequently asked questions about E135

What does E135 mean on a Samsung air conditioner?
E135 indicates that the indoor clean fan's rotational frequency feedback is not being received by the MICOM control board. The clean fan motor is expected to send RPM signal pulses back to the control board to confirm it is running at the correct speed. When that signal is missing, the system triggers E135 and halts operation. The issue typically originates in the feedback wiring connection or the clean fan motor itself.
How do I fix error code E135 on my Samsung air conditioner?
Start by checking the feedback connection line between the clean fan motor and the control board for loose connectors, broken wires, or corroded terminals. If the wiring appears intact, test the rotational output of the clean fan motor to verify it is spinning and generating a proper signal. If the motor is seized or its internal sensor has failed, the motor assembly will need to be replaced. A qualified technician should perform this diagnosis if you are not comfortable working with internal unit components.
Is it safe to run my Samsung air conditioner with an E135 error?
The unit will typically not operate normally while E135 is active, as the control system has detected a problem with the clean fan circuit. Attempting to force operation without resolving the fault is not recommended, as the underlying motor or wiring issue could worsen. Power the unit off until the fault is diagnosed and repaired.
Will resetting my Samsung air conditioner clear the E135 error?
A power reset may temporarily clear the error code display, but E135 will return if the underlying fault in the clean fan feedback circuit has not been fixed. The MICOM will attempt to read the RPM signal again on the next start cycle, and if the wiring or motor problem is still present, the code will reappear. A proper repair of the feedback wiring or motor is necessary for a permanent resolution.
How much does it cost to repair a Samsung air conditioner with error code E135?
If the issue is simply a loose connector or minor wiring repair, labor costs may be the primary expense, typically in the range of 75 to 150 dollars depending on your location and service provider. If the clean fan motor itself needs replacement, parts and labor combined could range from 150 to 400 dollars or more depending on the specific unit model and motor cost. Getting a diagnostic visit from a licensed technician will give you a more accurate estimate for your specific situation.

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