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Danby air conditioner E4 error code: display board communication error (portable and window)

Urgency
Medium
Who can fix it
Technician job
Time
About 10 min
Repair cost
$150–$350

What the E4 code means

E4 on a Danby air conditioner means the display panel has lost communication with the main control board. Danby lists it on portables and on window units such as the DAC060EB7WDB. Unplug the unit, plug it back in, and call for service if E4 returns.

The buttons and display sit on their own small board, which talks to the main control board through a cable. If the main board stops hearing from the display board, it stops the unit and shows E4.

On a window unit, water or condensation reaching the control area can also upset the boards. A one-off E4 that clears with a reset is not a concern.

Common causes

Listed from most to least common.

  1. Brief power glitch or surge
  2. Loose ribbon cable or connector between the display and main board
  3. Moisture on the display board
  4. Display board failed
  5. Main control board failed

How to fix the E4 code

Unplug the air conditioner or switch it off at the breaker before removing any panel or filter.

  1. Step 1: Unplug the unit

    Turn it off and unplug it for 5 to 10 minutes, as Danby advises.

  2. Step 2: Plug straight into the wall

    Use a wall outlet, not an extension cord or power strip, so the unit gets a steady supply.

  3. Step 3: Restart and watch

    Turn the unit on and use it normally. Note whether E4 appears at start-up or after it has run a while.

  4. Step 4: Call for service if it repeats

    If E4 returns, stop using the unit and call Danby Consumer Care at 1-800-263-2629.

If E4 keeps coming back

Write down when it happens, such as at start-up, after an hour, or on very humid days. That pattern helps a technician tell a loose cable from a failing board.

Ask for the diagnosis before agreeing to replace parts. Replacing the display board when the main board is at fault means paying twice.

How to reset the Danby air conditioner

  1. Turn the air conditioner off with the remote or the control panel.
  2. Unplug the unit and leave it for 5 to 10 minutes, as Danby's manuals advise.
  3. Plug it back in and turn it on. The compressor normally waits a few minutes before starting, so give it time before judging.
  4. If the same code comes back, the fault is still there. Work through the fix steps above, or call Danby Consumer Care at 1-800-263-2629.

When to call a technician

If E4 returns after a reset, a technician needs to check the cable between the boards and test the display and main boards. Do not open the cabinet yourself.

A typical repair for this code costs $150–$350 in the US, including parts and labor. Prices vary by area and model.

Models this applies to

  • Portable air conditioners (DPA series)
  • Window air conditioners (DAC series)

Codes can differ slightly between models. Your owner's manual is the final word and is available from Danby support.

Frequently asked questions

›Can a power outage cause E4?

Yes. A surge or brief outage can upset the boards. Unplugging for 5 to 10 minutes often clears it.

›Is E4 the same on Danby window and portable units?

Yes. Danby's portable manuals call it a display panel communication error, and the DAC060EB7WDB window manual calls it a display board communication error.

›Is E4 expensive to fix?

It depends on the part. A loose connector is cheap to fix. A new display or main board costs more, so get a quote first on an older unit.

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