E12 is displayed and the unit will not respond to temperature changes or shows incorrect temperatures.

Safety first: Disconnect from mains before opening the control panel or housing.

• Identify ambient sensor: On some Salter models, a small NTC sensor is mounted near the control PCB to monitor ambient temperature. Locate this sensor (often a small bead or epoxy‑coated component on two thin wires).
• Check mounting: Ensure the sensor is not dangling loose or touching hot metal parts. Reposition it in its original clip or bracket if necessary.
• Test sensor: Measure resistance at room temperature; compare with expected values from the service data (often similar to the cabinet NTC). Replace if open, shorted, or far out of range.
• Inspect wiring and connector: Ensure the sensor leads are intact and the connector is firmly seated on the PCB.
• PCB fault: If a known‑good sensor still results in E12, the ADC or related circuitry on the main PCB is likely defective, requiring PCB replacement.