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Samsung Air Conditioner Error Code E607

DMS to CAUR communication error.

Samsung codesSamsung air conditioner codes

DMS to CAUR communication error.

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What E607 means on a Samsung air conditioner

The E607 error code on a Samsung air conditioner indicates a communication failure between the DMS (Demand Management System) module and the CAUR (Central Autonomous Unit Receiver) module. These two components work together to coordinate demand control signaling and central system communication within multi-unit or commercial HVAC configurations. When the control signal pathway between them is interrupted or corrupted, the system logs E607 and typically halts normal operation to prevent uncoordinated behavior across connected zones.

The most common root causes of this error involve the wiring harness or signal cable connecting the DMS and CAUR modules. Loose connector pins, damaged insulation, or corroded terminals can all interrupt the low-voltage communication signal. In some cases, electromagnetic interference from nearby electrical equipment can disrupt the data line. A failed or malfunctioning DMS or CAUR circuit board can also produce this fault if the communication hardware itself has degraded.

Diagnosing E607 requires visually inspecting all communication wiring between the two modules, checking connectors for secure seating and corrosion, and verifying that both modules are receiving proper supply voltage. If wiring and connections appear intact, the fault likely resides within one of the two control boards. Systematic component substitution or board-level testing is typically needed to confirm which module has failed before ordering replacement parts.

Source: manufacturer service documentation.

Common causes of E607

  1. 01

    Loose or disconnected communication wiring

    Wiring / connection

    The signal cable between the DMS and CAUR modules may have come loose from its connector. Inspect both ends of the communication harness for secure seating and verify no pins have backed out of the connector housing.

  2. 02

    Corroded or damaged connector terminals

    Wiring / connection

    Moisture ingress or age can corrode the low-voltage connector pins on either module, increasing resistance and breaking the communication signal. Look for green or white oxidation on the terminals and any signs of water intrusion near the connectors.

  3. 03

    Faulty DMS module

    Part replacement

    The DMS circuit board may have failed internally, preventing it from sending or receiving communication signals to the CAUR. Board-level testing or substitution is needed to confirm this as the cause.

  4. 04

    Faulty CAUR module

    Part replacement

    If the CAUR unit has experienced a hardware failure, it will not respond to signals from the DMS, triggering the E607 fault. This is typically diagnosed after ruling out wiring and the DMS module.

  5. 05

    Damaged communication cable

    Part replacement

    Physical damage to the wiring harness such as pinching, cuts, or heat exposure can break continuity in the communication line. A continuity check along the full cable run will identify an open or shorted wire.

See the test procedure for each cause

Frequently asked questions about E607

What does E607 mean on a Samsung air conditioner?
E607 indicates a communication error between the DMS (Demand Management System) module and the CAUR (Central Autonomous Unit Receiver) module. This fault means the two control modules are unable to exchange data properly. It is commonly caused by wiring faults, connector corrosion, or a failed control board in either module.
Can I fix the E607 error myself?
Some basic checks, such as inspecting visible wiring and reseating connectors, can be performed by a knowledgeable DIYer. However, diagnosing a failed DMS or CAUR board and replacing those components typically requires familiarity with HVAC control systems and access to the appropriate replacement parts. For most homeowners, this repair is best handled by a certified technician.
Will resetting the air conditioner clear the E607 error?
A power reset may temporarily clear the error display, but if the underlying communication fault still exists, the E607 code will return once the system restarts and attempts communication between the modules. A reset is useful for confirming whether the fault is intermittent, but it does not substitute for proper diagnosis and repair.
Is it safe to keep running my air conditioner with an E607 error?
Continuing to operate the system with an active E607 fault is not recommended. The communication breakdown between the DMS and CAUR modules can lead to uncoordinated system behavior or prevent the unit from responding correctly to demand and control signals. Shutting the system down until the fault is resolved is the safer course of action.
How much does it cost to repair an E607 error on a Samsung air conditioner?
Repair costs vary depending on the root cause. If the fix involves reseating a connector or replacing a wiring harness, costs are generally in the range of $75 to $200 for a service call and labor. If a DMS or CAUR control board needs to be replaced, total costs including parts and labor can range from $250 to $600 or more depending on the specific model and part availability.

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