Oven
E4
The E4 error code on a Samsung oven indicates a problem with the oven temperature sensor or its circuit — it’s a moderately serious fault that will prevent the oven from heating safely until it’s resolved.
What does this error mean?
The E4 code tells you that the oven’s control board has detected an abnormal reading from the temperature sensor (also called a thermistor or oven sensor probe). Either the sensor is reading a temperature that’s implausibly high, the sensor has failed entirely, or the wiring connecting it to the control board is damaged. The oven locks out heating as a safety precaution to prevent overheating or a fire.
Est. repair cost
£15–£35 DIY sensor replacement; £80–£150 professional repair; £150–£300 if control board replacement is needed
🔍 Likely causes
🛠️ Step-by-step fix
Reset the oven first: switch it off at the wall socket (or trip the circuit breaker), wait 5 minutes, then restore power. If E4 clears and doesn’t return, it was a temporary glitch.
Check the oven sensor probe: it’s usually a thin metal rod mounted on the back wall inside the oven cavity. Inspect it visually for cracks, burns, or heavy grease deposits. Clean gently with a damp cloth if soiled.
Test the sensor resistance: if you have a multimeter, unplug the oven, locate the sensor connector (behind the back panel inside the cavity), and measure resistance across the two sensor terminals. A healthy Samsung oven sensor typically reads around 1,080–1,100 ohms at room temperature. A reading far outside this range confirms a failed sensor.
Replace the temperature sensor: Samsung oven sensors are widely available online for £15–£35. Note your exact model number (inside the oven door frame), order the correct part, unplug the oven, unscrew the old sensor, unplug its connector, and fit the new one in reverse order. This is a safe DIY task.
Inspect the wiring: with the oven unplugged, trace the sensor cable from the probe to where it connects at the back. Look for any melted insulation, loose connectors, or visibly broken wires. Re-seat any loose connectors firmly.
If the sensor tests fine and wiring looks intact, the fault is likely the control board (PCB) — do not attempt to repair the PCB yourself; call a qualified appliance engineer.
📞 When to call a professional
Call an appliance engineer if replacing the temperature sensor doesn’t clear the E4 code, or if you find burnt or melted wiring inside the oven cavity. When you call, tell them you have a Samsung oven showing error code E4 and that you’ve already replaced or tested the sensor — this will save diagnostic time and cost. Also call a professional if you’re not comfortable removing internal oven panels or working near electrical components.
⚖️ Repair or replace?
A sensor replacement carried out by an engineer typically costs £80–£150 including parts and labour. A control board replacement is more expensive at £150–£300. If your Samsung oven is more than 8–10 years old and the repair quote exceeds £150, it’s worth comparing against a new mid-range built-in oven (£300–£600), particularly if other components are ageing. For ovens under 6 years old, repair almost always makes financial sense.