Samsung Air Conditioner Error Code E307

E307 indicates a PWM discharge temperature sensor error in the outdoor unit. The control board has detected that the sensor signal voltage is either above 4.95V (indicating an open circuit, reading below -30°C) or below 0.5V (indicating a short circuit, reading above 151°C). Neither condition is a real temperature, so the system shuts down to protect the compressor. This fault only activates when outdoor ambient temperature is above -10°C.

No. The unit will typically shut itself down when E307 is active precisely because the discharge temperature sensor is what protects the compressor from overheating. Operating the system without a functioning discharge temperature sensor risks compressor damage, which is one of the most expensive repairs on an air conditioner. The unit should remain off until the sensor fault is resolved.

A power reset may temporarily clear the code from the display, but if the underlying sensor fault still exists, the error will return quickly once the unit attempts to operate and the outdoor temperature is above -10°C. A reset alone is not a fix. The sensor connector, sensor resistance, and wiring must be inspected and the root cause corrected before the unit will operate normally.

If the sensor connector has simply come loose from the outdoor PCB, a knowledgeable DIYer comfortable working inside an outdoor unit can reseat it and clear the fault. However, if the sensor or wiring needs to be replaced, or if resistance measurements are required to confirm the diagnosis, a qualified HVAC technician is the safer choice. Working inside the outdoor unit involves exposure to high-voltage components and refrigerant lines.

If the fix is simply reseating a loose connector, there may be little cost beyond a service call fee, typically in the range of $75 to $150. Replacing the discharge temperature sensor itself is generally an inexpensive part, but with labor the total repair cost commonly falls between $100 and $300. If the outdoor PCB is also damaged, costs can increase significantly depending on the unit model.