Seeing **1 AC** on a Samsung washing machine narrows the problem to **communication / electronic control error**. What you do next depends on whether the code is an issue, a normal status/test message, or a model-dependent interpretation. The exact stage when the code appears can be as important as the characters themselves. Note whether it happens at startup, during fill, heating, cooling, draining, spinning, drying, or after a power event. The recorded display form is **1 AC**. Search normalization stores it as **1AC** while preserving the characters a homeowner actually sees.
Reviewed by Ethan Mercer · Last reviewed August 17, 2026
Written by
Ethan Mercer Appliance Repair Content SpecialistPublished August 17, 2026Updated August 22, 2026Technically reviewed August 17, 2026
Content status:
Verified
Error code1AC
ApplianceWasher
Quick answer
Communication / electronic control error.
Model compatibility: Samsung can reuse or reformat codes across series and model years, so 1AC may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
Seeing **1 AC** on a Samsung washing machine narrows the problem to **communication / electronic control error**. What you do next depends on whether the code is an issue, a normal status/test message, or a model-dependent interpretation. The exact stage when the code appears can be as important as the characters themselves. Note whether it happens at startup, during fill, heating, cooling, draining, spinning, drying, or after a power event. The recorded display form is **1 AC**. Search normalization stores it as **1AC** while preserving the characters a homeowner actually sees.
Signs
Symptoms you may notice
The 1 AC display becomes more meaningful if the appliance may lose communication between control boards, display, inverter, or other electronic modules.
One clue that supports the 1 AC diagnosis is that controls can become unresponsive, a feature can stop, or the code may appear after power-up.
Depending on the exact model, intermittent operation can occur if a connection or power condition is unstable.
One clue that supports the 1 AC diagnosis is that 1 AC appears during the washer stage associated with communication / electronic control error.
Depending on the exact model, the cycle can pause, stop, retry, drain, or refuse to advance until the condition is cleared.
Why it happens
Possible causes
varies by model/region — cross-region baseline — Communication / electronic control error
Before you call
Safe checks you can make
These are simple, non-hazardous checks only. If anything is unclear, stop and contact a technician.
The next non-invasive check is to power the appliance off once using the documented method, then restore power and see whether the code reappears.
To rule out an accessible cause, record whether the issue followed an outage, update, move, or service event.
Before opening any service area, do not reseat internal live connectors unless qualified to follow the exact service procedure.
To rule out an accessible cause, record the code and the cycle stage where it appears.
Before opening any service area, check owner-accessible water supply, drain hose/filter, load balance, door, detergent, or power only when relevant.
Before opening any service area, power-cycle once only where Samsung's guidance recommends it; if the same code reappears, move to model-specific diagnosis.
Important safety warning. Disconnect power and stop use for active leakage near electrical parts, smoke, burning smell, or repeated breaker trips. Do not bypass a safety device merely to see whether 1 AC disappears.
Get help
When to request repair service
A returning communication/electronic-control code can require harness, connector, board power-supply, firmware, or module testing. In a service visit for 1 AC, model-specific testing should follow the communication / electronic control error circuit rather than treating the code as proof of one failed part.
Book your repair
Seeing this code on your Samsung appliance?
Book a specialist visit for a clear estimate and approval before any repair.
One controlled restart is reasonable after correcting an obvious external issue. A recurring **1 AC** display should be treated as diagnostic evidence, not as a reason to keep rebooting the appliance.
Short owner-accessible checks may be reasonable when the appliance is safe. Persistent **1 AC**, worsening performance, or any electrical/water/heat hazard is a reason to stop use.
No. **1 AC** tells you which condition or check the control detected. The same display can result from the named component, its wiring, a connector, a supply/airflow/water condition, or the control that reads it.
The same-looking code can be reused on another Samsung appliance family or reformatted by region/model year. Match the appliance type and exact model before applying a meaning. This page therefore keeps **Washer 1 AC** separate from same-looking codes used by other Samsung appliance families.
