Last Updated on October 5, 2026 by Umar Farooq
A Samsung washer showing AC — or AC3, AC4, AC5, AC6, AC7, ACb, AE, AE3, AE4, AE5, AE6, AE8, AEb, AEB, 1AC or 1AC6 — is not reporting a part that failed at its job. It is reporting that two of its control boards stopped hearing each other. Samsung files the whole group under one heading, “Communication Error,” with no named cause attached to any variant (Samsung washing machine information and error codes).
That distinction changes what there is to look for. The main control board does not run the washer by itself — it trades messages continuously with the board behind the display and with the inverter board that governs motor speed. Every one of those messages travels a physical path: a connector, a plug, a length of harness clipped along the inside of the cabinet. When a board asks for something and nothing comes back, it has no way to tell whether the other board died or the wire between them worked loose. It reports the silence, because the silence is all it can observe.
So the fault is at least as likely to be in the path as in either board — a connector shaken loose over several years of spin cycles, a harness rubbed where it crosses an edge, moisture sitting at a plug. That is encouraging news about the repair and discouraging news about doing it yourself, because almost every inch of that path lives behind panels with line-voltage wiring on the other side. There are two things genuinely worth doing here: one reset, performed properly, and one accurate record of what the machine displayed.
This guide is for a Samsung washer showing AC or one of its documented variants. It is not for a washer that won’t power up at all, and not for a machine that refuses to start with no code on the display. The variant matters more here than with most Samsung codes: one of them is documented with a component attached and most are not, and which one you have decides whether you start a service call with a named board or just a family name.
What the Samsung washer AC communication error means, and what Samsung won’t say
Samsung’s US code list gives this family a single line and stops. There is no cause, no stage of the cycle, no consumer procedure — just the words “Communication Error” against a long list of displayed variants. Compare that with how the same page treats suds, where Samsung states outright that the condition “does not indicate that service is needed” and is “caused by an incorrect use of detergent.” When Samsung can hand a fault back to the owner, it does. Here it doesn’t, and that silence is itself information about where this code sits.
Samsung does not go one step further for any variant, and the suffixes are the place to notice it. AC6 and AE6 sit in the same section of Samsung’s reference as the rest of the group — the part set aside for codes where “there is no specific troubleshooting for it” — and the only procedure attached to any of them is the generic one: “Power off the washer for 2-3 minutes.” Power it back on. Restart the cycle. Request service only “If the error continues” (Samsung washing machine information and error codes). No component is named for any suffix.
What Samsung does not publish anywhere is a consumer-level test. There is no documented voltage or resistance figure for this harness, no connector check, no pin-out written for owners. Don’t trust the numbers that circulate for this circuit outside Samsung’s own materials — this site will not print an electrical test value, and a figure copied from a forum is worth what it cost. Treat the absence as intentional rather than as a gap you are meant to fill in with guesswork.
| What your display shows | What Samsung documents | What that gives you |
|---|---|---|
AC, AE, 1AC | “Communication Error” | The family, with no component named |
AC6, AE6, 1AC6 | Listed inside the same “Communication Error” group, with no entry of their own | Nothing beyond the family. Samsung names no component for these suffixes |
AC3, AC4, AC5, AC7, ACb | Listed separately, same family | Record the suffix exactly — the variants are documented as distinct |
AE3, AE4, AE5, AE8, AEb, AEB | Listed separately, same family | Same: the trailing character is the detail a technician wants |
Two nearby families get mistaken for this one, and both send you somewhere different. 9C1, 9C2, 9E1, 9E2, PF and UC are Samsung’s voltage codes — “There is an irregularity in the electrical current being supplied to the washer” — which is a supply problem, not a conversation between boards. 3C is the drum motor code, documented by Samsung as nothing more than “Motor Error”; if that is what your panel shows, start at Samsung washer 3C motor error instead. Photograph the display and read the photo zoomed in before deciding which page you are on.
Normal behavior vs. an actual fault
One AC that clears on a power cycle and never comes back is not evidence of a failed board. Samsung allows for it directly: “A power cycle can, in rare instances, resolve your issue all by itself” (how to reset your Samsung washing machine). And its instruction for this code family is to request service only “If the error continues” — which is Samsung telling you to watch first, not to replace a board. A momentary interruption — a brownout, a surge, a plug that lost contact for an instant — can break a message mid-transmission without damaging anything at either end. What separates that from a real fault is repetition, not severity.
Treat it as a genuine fault when:
- The code returns immediately after a full power cycle.
- It appears on every attempt to start a cycle.
- It appears at the same point each time, particularly at spin, when the inverter is working hardest.
- The washer won’t complete the reset sequence at all.
Write down the exact variant before you touch anything
This sounds like housekeeping and it is the highest-value thing on this page. Almost every service call for this code starts with an owner saying “it showed an AC error,” which tells the technician nothing beyond what the family already implies. An owner who says “AC6, every time, about ninety seconds into spin, and it cleared once after an outage last month” has narrowed the job to the motor-side link and said when the fault loads up. That is a different appointment, and often a shorter one.
Recording first also protects you from your own reset. Samsung is blunt about what a reset does: “Resetting your washing machine will clear out all the error codes in its memory, but this won’t automatically fix whatever error is occurring.” Clearing the display also clears the evidence, so write it down first and reset second — in that order, never the reverse.
- Model number, on a label at the door frame on a front-loader or under the lid edge on a top-loader.
- The exact code, character by character, from a photograph rather than memory.
- When it appears — on power-up, at cycle start, or partway through a cycle.
- Whether it returns after a power cycle, and how quickly.
- Any recent event before the first occurrence: an outage, a house move, a delivery, or a repair that involved the panel or wiring.
Run the reset once, and only once
!Close-up of an electric plug and wall socket
The reset is not a repair and it isn’t really a fix attempt. It is a test with one question behind it: does this code come back? Samsung has already said some occurrences resolve on their own, so a single controlled power cycle separates the machines that had a momentary interruption from the machines with something physically wrong on the link. Run it once and you get a clean answer to that question. Run it five times and all you have is a washer with no stored fault history and a display still saying the same thing.
- Turn the washer off at the control panel.
- Unplug it, or switch off the breaker if it’s hardwired.
- Wait before restoring power — Samsung puts the time needed for the charge to clear at “1 to 5 minutes at most.”
- Power up and restart the cycle you were running.
- Watch whether the code returns immediately, returns at a specific point, or doesn’t return.
If it comes straight back, stop resetting. Repeating it won’t change the outcome, and each repeat costs you history a technician would have read.
Why the DIY list for a Samsung washer AC communication error ends here
!Detailed close-up of an electrical connector cable with a blurred background
Most Samsung codes have an owner-side half. A fill code has taps, hoses and screens. A drain code has a pump filter you can reach in a minute. An unbalanced code has a load you can redistribute. This one has none of that, and the reason is geometry rather than difficulty: the communication path between the main control, the display board and the inverter runs entirely inside the cabinet, and the panels covering it also cover line-voltage wiring. There is nothing on that path an owner can reach from outside the machine.
That is also why this page doesn’t list connectors to reseat. Reseating a plug sounds harmless, and in the right hands it is a reasonable repair — but it means opening a housing, working next to circuits that hold charge after unplugging, and knowing which connector belongs to which board on your specific model. Samsung publishes no consumer procedure for that and no reference for identifying the right plug. A guide that invented the steps would be guessing at your expense, so this one stops at the cabinet.
Stop-use warning. Unplug the washer and stop if you notice a burning smell, visible scorching near the control panel, or a display behaving erratically beyond showing the code. Cut power at the breaker rather than the plug if anything smells electrical.
Prove it with an empty cycle that reaches full spin
If the code cleared, prove it before trusting the machine with a full load of wet laundry. AC6 and AE6 point at the inverter link, and the inverter is under the most demand during spin — which means a marginal connection can pass a wash and fail an extraction. An empty cycle that reaches full spin exercises the exact part of the conversation this code complains about, and it does so with nothing in the drum to soak if the cycle stops halfway through.
- Run an empty cycle that includes a spin phase.
- Confirm it completes without the code returning.
- If it’s clean, run one normal load.
- If the code returns, note exactly where in the cycle it happened.
A code that returns at the same point twice is a persistent fault, and the point where it returns is worth more to a technician than the code itself.
The four things to hand over when you book
Stopping here isn’t giving up on the repair — it’s recognizing that the work left is on the other side of a panel. Call Samsung support or a qualified technician when:
- The code returns immediately after a full power cycle, or on every cycle attempt.
- It appears consistently at the same point in the cycle, particularly at spin.
- Buttons are unresponsive, or the display is blank or flickering alongside the code.
- You smell anything electrical, or see damage near the panel or wiring.
Hand over four things when you book: the model number, the exact code variant, when in the cycle it appears, and whether a single reset cleared it. That last one matters more than it sounds, because it tells a technician whether they are chasing an intermittent connection or a dead one — and those are different jobs with different first moves.
FAQ
What’s the difference between AC and AC6?
Samsung does not distinguish them. Both sit in the same “Communication Error” group, and Samsung names no component for either one. Write down which you see anyway — the suffix is the detail a technician wants, even though Samsung publishes nothing about it.
Can I test the inverter board or harness myself?
No. Samsung publishes no consumer test procedure and no documented values for it, and this site won’t print an electrical test figure. If the reset doesn’t hold, this needs service.
Does a power outage or surge cause this?
It’s a plausible trigger for a one-off, since an interruption can break a message mid-signal without damaging anything. Samsung also “does not recommend using surge protectors with our washers,” so a protector between the machine and the outlet is worth removing from the picture.
My control panel isn’t responding at all — is that the same issue?
It can be related, but unresponsive buttons with no code showing is a separate symptom with broader checks — see washing machine control panel not responding.
My washer has power but won’t start a cycle — is that connected?
Possibly, if an AC-family code is also showing. With no code, the common causes are different and worth ruling out first — see washing machine has power but won’t start.
My washer won’t turn on at all, with no display — same thing?
No. That’s power delivery, not a conversation between boards that are already powered — see washing machine won’t turn on.
