How to Fix Samsung Dryer Error AC4

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⚠️ Safety Warning: Appliance repair involves electricity, gas, and moving parts. Always disconnect power before working on any appliance.

Error Code: AC4 Difficulty: Moderate

Problem: Communication error between main board and Wi-Fi board

How to Fix AC4 Error

UNPLUG THE DRYER. This is a communication error between the main control board and the Wi-Fi sub-board.
First, perform a hard reset by leaving the dryer unplugged for 10 minutes.
If the error returns, you must access the internal electronics. Remove the top panel or console.
Check the wire harness connecting the small Wi-Fi module to the main control board. Reseat the connection firmly. If the error persists, the Wi-Fi module has failed and needs to be replaced.

OEM Part #: Part number varies by model (Wi-Fi Module / Sub-PBA)

Estimated Market Price: N/A

If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.

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Estimated repair cost (parts, or parts + labor) Most DIY parts are $50–$250. If you have a quote, use the total.

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