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Error code reference

Samsung Air Conditioner Error Code E445

CCH malfunction and sump sensor miswiring error

Samsung codesSamsung air conditioner codes

CCH malfunction and sump sensor miswiring error - CCH connector not connected or sump sensor detached.

First step from the service manual

Check if CCH connector is connected to PCB.

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 E445 means on a Samsung air conditioner

The E445 error code on a Samsung air conditioner indicates a CCH (Crankcase Heater) malfunction combined with a sump sensor miswiring fault. The CCH is a resistance heater element wrapped around or mounted near the compressor sump that keeps the compressor oil warm during periods of inactivity, preventing refrigerant from migrating into the oil and causing compressor damage on startup. The sump sensor monitors the temperature at this location and reports back to the main PCB to confirm the heater is operating correctly and that oil temperature is within safe range.

The E445 code triggers when the PCB detects that either the CCH connector is not properly seated at the board, or the sump temperature sensor has become detached from its mounting position. Both conditions cause the control system to lose confidence in crankcase heater operation. A disconnected CCH connector means the heater receives no power, while a detached sump sensor means the PCB cannot read accurate temperature data from the compressor sump area regardless of whether the heater itself is functioning.

The first diagnostic step is to physically inspect the CCH connector at the PCB and confirm it is fully seated. If the connector is secure, attention should shift to the sump sensor, checking that it is properly attached to the compressor sump and that its wiring harness is intact with no visible damage, pinching, or corrosion at the connector pins. Both components must be operational and correctly connected for the error to clear.

Source: manufacturer service documentation.

Common causes of E445

  1. 01

    CCH connector disconnected from PCB

    Wiring / connection

    The crankcase heater connector may have vibrated loose from the main PCB over time. Visually inspect the connector seating at the board and press it firmly into place to confirm a secure connection.

  2. 02

    Sump sensor detached from compressor

    Wiring / connection

    The sump temperature sensor can become dislodged from its mounting on the compressor body, causing the PCB to lose accurate temperature readings. Check that the sensor is physically secured against the sump surface and has not fallen free.

  3. 03

    Damaged or broken wiring harness

    Part replacement

    The wiring between the sump sensor or CCH heater and the PCB may have a break, pinch, or corroded connector pin. Inspect the full length of both harnesses for visible damage and test for continuity.

  4. 04

    Failed CCH heater element

    Part replacement

    The crankcase heater element itself may have failed open, causing the PCB to detect an abnormal circuit condition. Test the heater element resistance with a multimeter and compare to the specified value for the unit.

  5. 05

    Failed sump temperature sensor

    Part replacement

    The sump sensor may have failed internally even if it appears properly connected and positioned. A faulty sensor will report incorrect or out-of-range resistance values and will need to be replaced.

See the test procedure for each cause

Frequently asked questions about E445

What does E445 mean on a Samsung air conditioner?
E445 indicates a CCH (crankcase heater) malfunction combined with a sump sensor miswiring fault. The error appears when the PCB detects that the CCH connector is not properly connected to the board or the sump temperature sensor has become detached from the compressor. Both conditions prevent the system from confirming safe crankcase heater operation.
Can I fix E445 on my Samsung air conditioner myself?
If the issue is simply a loose CCH connector at the PCB, a knowledgeable DIYer can reseat the connector after safely disconnecting power to the unit. However, accessing the compressor sump area and inspecting the sensor mounting typically requires opening the unit cabinet and working near refrigerant components, which is generally best left to a qualified technician. Any work involving the electrical components of the compressor circuit should be performed with the unit fully powered down.
Is it safe to run my Samsung air conditioner with an E445 error?
Running the unit with an active E445 error is not recommended. The crankcase heater is a protective component that keeps compressor oil from absorbing refrigerant during off cycles. If the heater is non-functional and this goes undetected due to a sensor fault, starting the compressor with refrigerant-saturated oil can cause serious and costly compressor damage.
Will resetting my Samsung air conditioner clear the E445 error?
A power reset may temporarily clear the E445 error display, but the code will return if the underlying cause is not resolved. The connector, sensor mounting, and wiring must be inspected and corrected before the error clears permanently. Repeated resets without addressing the fault risk compressor damage over time.
How much does it cost to repair a Samsung air conditioner E445 error?
If the fix is only a loose connector that needs reseating, costs may be limited to a service call fee, typically in the range of $75 to $150. If a sump sensor or CCH heater element needs replacement, parts and labor combined could range from $150 to $400 or more depending on the unit model and local labor rates. Compressor damage resulting from an unaddressed CCH fault would be significantly more expensive to repair.

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