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Error code reference

Atwood Refrigerator Error Code No Communication from Display Board

No communication between display board and power board; all heat sources are turned OFF.

Atwood codesAtwood refrigerator codes

No communication between display board and power board; all heat sources are turned OFF.

First step from the service manual

Check J1 connector (5-pin) between display board and power board for proper connection.

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

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What No Communication from Display Board means on a Atwood refrigerator

The "No Communication from Display Board" error on an Atwood refrigerator indicates that the power board has lost its data link with the display board. These two boards work together as a system: the display board handles user input and status output, while the power board controls the actual heating elements and cooling functions. When communication between them breaks down, the power board defaults to a safe state by shutting off all heat sources, including the AC heating element, DC heating element, and gas burner. The refrigerator cannot operate in any mode until the communication link is restored.

The primary data pathway between these two boards is the J1 connector, a 5-pin harness that carries both power and serial communication signals. A loose, corroded, or damaged pin in this connector is the most frequent cause of this fault. Physical vibration during travel (common in RV applications), moisture exposure, or simple connector fatigue can all cause intermittent or complete loss of signal across this harness. Inspecting the J1 connector for proper seating, bent pins, corrosion, and secure locking is the required first diagnostic step.

If the J1 connector checks out physically and electrically, the fault may lie within the display board or power board themselves. A failed microcontroller, damaged communication circuitry, or a shorted trace on either board can prevent the handshake signal from being established. In these cases, board-level repair is generally not practical and component replacement becomes necessary. Diagnosing which board is at fault typically involves substitution testing or further voltage and continuity checks along the communication circuit.

Source: manufacturer service documentation.

Common causes of No Communication from Display Board

  1. 01

    Loose or Disconnected J1 Connector

    Wiring / connection

    The 5-pin J1 connector linking the display board and power board may have worked loose due to vibration or handling. Check that the connector is fully seated and locked on both ends.

  2. 02

    Corroded or Damaged Connector Pins

    Wiring / connection

    Moisture exposure can cause corrosion on the J1 connector pins, increasing resistance and breaking the communication signal. Inspect each pin for oxidation, pitting, or debris and clean or replace the connector as needed.

  3. 03

    Damaged Wiring Harness

    Part replacement

    The wiring between the display board and power board may have a broken wire, pinched insulation, or a short caused by chafing. Trace the harness along its full length and check for visible damage.

  4. 04

    Failed Display Board

    Part replacement

    The display board itself may have failed internal communication circuitry, preventing it from sending or receiving signals to the power board. If the connector and wiring are confirmed good, the display board is the next suspect.

  5. 05

    Failed Power Board

    Part replacement

    If the display board tests correctly and all wiring is intact, the power board may have failed communication hardware that prevents it from recognizing the display board. Power board replacement would be required.

See the test procedure for each cause

Frequently asked questions about No Communication from Display Board

What does No Communication from Display Board mean on a Atwood refrigerator?
This error means the power board inside your Atwood refrigerator has lost its communication link with the display board. Because the two boards can no longer coordinate, the refrigerator shuts off all heat sources as a precaution. The unit will not cool or function in any mode until the communication problem is resolved. The fault most often traces back to the 5-pin J1 connector between the two boards.
How do I fix the No Communication from Display Board error on my Atwood refrigerator?
Start by inspecting the J1 connector, the 5-pin harness that runs between the display board and the power board, to ensure it is fully seated and free of corrosion or bent pins. Disconnect and firmly reconnect the connector on both ends, then power cycle the refrigerator to see if the error clears. If the fault returns, trace the wiring harness for damage. If the harness is intact, one of the two boards may need to be replaced.
Is it safe to use my Atwood refrigerator when this error is showing?
The refrigerator is not operating when this error is active because the power board shuts off all heat sources as part of its fault response. This means the unit is not actively cooling, so any perishable food inside is at risk. The error should be addressed promptly, but the fault state itself does not create a fire or electrical hazard. Do not attempt to bypass the boards to force operation.
Will resetting my Atwood refrigerator clear the No Communication from Display Board error?
A power cycle reset may temporarily clear the error if the cause is a momentary signal dropout or a slightly loose connector. However, if there is a physical connection problem, wiring fault, or board failure, the error will return after reset. The underlying cause must be diagnosed and corrected for a lasting repair. Use a reset only as a quick check to confirm whether the fault is intermittent or persistent.
How much does it cost to repair a No Communication from Display Board error on an Atwood refrigerator?
If the fix is simply reseating or cleaning the J1 connector, the repair cost may be minimal, covering only a service call if a technician is involved. If the wiring harness needs repair or replacement, parts and labor costs will vary depending on the extent of the damage. Board replacement, whether the display board or power board, typically ranges from moderate to higher cost depending on part availability and labor rates. Getting a diagnostic assessment before committing to board replacement is advisable.

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