The **TC4** display on a Samsung washing machine points to **temperature-sensor signal issue**. Treat it as a diagnostic direction rather than a parts order: operating conditions, wiring, sensors, actuators, and control electronics can overlap. 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 **TC4**. Search normalization stores it as **TC4** 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 codeTC4
ApplianceWasher
Quick answer
Temperature-sensor signal issue.
Model compatibility: Samsung can reuse or reformat codes across series and model years, so TC4 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
The **TC4** display on a Samsung washing machine points to **temperature-sensor signal issue**. Treat it as a diagnostic direction rather than a parts order: operating conditions, wiring, sensors, actuators, and control electronics can overlap. 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 **TC4**. Search normalization stores it as **TC4** while preserving the characters a homeowner actually sees.
Signs
Symptoms you may notice
One clue that supports the TC4 diagnosis is that the control may stop or limit operation because a temperature reading is missing or implausible.
One clue that supports the TC4 diagnosis is that heating, cooling, drying, or defrost behavior can become inconsistent.
The TC4 display becomes more meaningful if the display can return at a similar stage each time the affected sensor is checked.
On affected Samsung washing machine models, tC4 appears during the washer stage associated with temperature-sensor signal issue.
When the TC4 condition is present, the cycle may pause, stop, retry, drain, or refuse to advance until the condition is cleared.
Why it happens
Possible causes
varies by model — official regional/current support — Temperature-sensor signal issue
Before you call
Safe checks you can make
These are simple, non-hazardous checks only. If anything is unclear, stop and contact a technician.
To rule out an accessible cause, record when the code appears and whether the appliance had just heated, cooled, or defrosted.
To rule out an accessible cause, confirm vents, doors, filters, and ambient conditions are normal where they affect the sensor reading.
The next non-invasive check is to use the exact model manual before assuming the sensor itself is defective.
With TC4 recorded, record the code and the cycle stage where it appears.
A safe owner-level check is to check owner-accessible water supply, drain hose/filter, load balance, door, detergent, or power only when relevant.
The next non-invasive check is to power-cycle once only where Samsung's guidance recommends it; if the same code returns, move to model-specific diagnosis.
Important safety warning. When working around a washing machine that shows TC4, keep the checks external and non-invasive. Disconnect power and stop use for active leakage near electrical parts, smoke, burning smell, or repeated breaker trips.
Get help
When to request repair service
Once TC4 has returned after the safe checks, Persistent temperature-sensor codes usually require resistance/connection checks at the sensor, harness, and control—work best done with the model-specific service procedure. Preserve any accompanying noise, water level, temperature, or operating-stage details for the technician.
Book your repair
Seeing this code on your Samsung appliance?
Book a specialist visit for a clear estimate and approval before any repair.
A single documented power reset can help after an external condition or power event is corrected. If **TC4** returns at the same stage, repeated resets only erase useful evidence and do not repair the cause.
Do not keep operating the appliance through a hazardous symptom just to see whether **TC4** clears. If there is heat, water, electrical, gas, or food-safety risk, stop and arrange diagnosis.
Treat **TC4** as a starting point, not a replacement instruction. Wiring, feedback signals, operating conditions, and electronic controls can mimic a failed component.
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 TC4** separate from same-looking codes used by other Samsung appliance families.
