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Error code reference

GE Dryer Error Code 16

UI-MC Heartbeat Timeout

GE codesGE dryer codes

UI-MC Heartbeat Timeout - No communication between the UI and MC for 60 seconds.

First step from the service manual

Check and replace Main Board, User Interface Board and/or Harness if necessary.

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

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What 16 means on a GE dryer

Error code 16 on a GE dryer indicates a UI-MC Heartbeat Timeout, meaning the User Interface (UI) board and the Main Control (MC) board have lost communication with each other for a continuous period of 60 seconds. These two boards rely on a serial communication link, often referred to as a heartbeat signal, to continuously exchange data during operation. When that signal is interrupted or absent for the full 60-second threshold, the dryer's control system registers the fault and halts normal operation to prevent unsafe or uncontrolled behavior.

The communication between the UI board and the MC board typically travels through a wiring harness connecting the two components. Any break, short, or loose connector along that harness can disrupt the signal entirely. Corrosion at connector pins, a pinched wire, or a connector that has vibrated loose over time are all common physical causes. In some cases, the harness itself may appear intact visually but still have an intermittent internal wire break that only manifests during operation.

If the harness checks out as undamaged and properly seated, one of the two control boards is likely at fault. Either the UI board has failed and is no longer transmitting its heartbeat signal, or the MC board has failed and can no longer receive or respond to it. Because both boards depend on this communication loop to function, a failure on either end produces the same code. Diagnosis involves inspecting the harness first, then evaluating each board individually to determine which component has failed.

Source: manufacturer service documentation.

Common causes of 16

  1. 01

    Loose or disconnected wiring harness

    Wiring / connection

    The harness connecting the UI board to the MC board may have a loose or unplugged connector. Check both ends of the harness for secure, fully seated connections before assuming a board has failed.

  2. 02

    Damaged or faulty wiring harness

    Part replacement

    A wire within the harness may be broken, pinched, or corroded, interrupting the communication signal. Inspect the full length of the harness for visible damage, and check connector pins for corrosion or bending.

  3. 03

    Failed User Interface (UI) board

    Part replacement

    If the UI board has failed internally, it will stop transmitting the heartbeat signal to the MC board, triggering this timeout error. A failed UI board typically requires replacement rather than repair.

  4. 04

    Failed Main Control (MC) board

    Part replacement

    A faulty MC board may be unable to receive or respond to the UI board's communication signal, producing the same 60-second timeout. If the harness and UI board test out correctly, the MC board is the likely culprit.

  5. 05

    Intermittent connection due to vibration

    Wiring / connection

    Normal dryer vibration during operation can cause connectors to work loose over time. A connector that looks seated may not be making reliable contact, causing communication dropouts that accumulate until the timeout threshold is reached.

See the test procedure for each cause

Frequently asked questions about 16

What does 16 mean on a GE dryer?
Error code 16 on a GE dryer signals a UI-MC Heartbeat Timeout, meaning the User Interface board and the Main Control board lost communication with each other for 60 consecutive seconds. The dryer shuts down and displays this code to prevent unsafe operation. The fault can originate from the wiring harness connecting the two boards or from a failure in either board itself.
Can I fix error code 16 on my GE dryer myself?
Some DIYers with appliance repair experience can address this error by inspecting and reseating the wiring harness connectors between the UI and MC boards, which requires accessing the dryer's control area. If the harness connections are secure and undamaged, the repair typically advances to replacing one or both control boards, which involves working with electronic components and wiring. If you are not comfortable working inside appliances, a qualified technician is the safer choice.
Will resetting my GE dryer clear error code 16?
Unplugging the dryer for a few minutes may temporarily clear the error code, but it will return if the underlying communication problem has not been resolved. The 60-second timeout is a persistent fault condition tied to an actual hardware issue, not a software glitch. A reset is useful for confirming whether the fault is intermittent, but it is not a permanent fix.
Is it safe to use my GE dryer while error code 16 is displayed?
The dryer will typically not operate normally while this error is active, as the control system halts operation when the communication link between boards is lost. Attempting to force the dryer to run with a known board communication fault is not recommended. Address the underlying cause before resuming regular use.
How much does it cost to repair error code 16 on a GE dryer?
Repair costs vary depending on which component has failed. If only the wiring harness needs replacement, costs are generally lower, often in the range of $50 to $150 including parts and labor. Replacing a UI board or MC board typically runs higher, with total repair costs often falling between $150 and $400 depending on the specific board, part availability, and local labor rates. Getting a diagnostic estimate before authorizing repairs is advisable.

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