Microwave display shows an internal temperature or sensor error; cooking modes that rely on humidity or temperature sensing fail or abort.

Safety: Unplug the microwave before cleaning inside or accessing any internal components.

User-level steps:

• 1. Clean the cavity thoroughly: Wipe down the interior walls, ceiling, and especially the area where the humidity or temperature sensor is located (often behind a small grill or cover). Use a mild detergent and a soft cloth; avoid abrasive pads.
• 2. Dry the cavity: After cleaning, leave the door open for at least 30 minutes to allow moisture to evaporate. Excess moisture can cause false sensor readings.
• 3. Reset the unit: Unplug the microwave for 5 minutes, then plug it back in to clear any stored sensor error state.
• 4. Test manual modes: Try basic timed microwave heating. If manual modes work but sensor-based auto programs fail, the sensor or its circuit is likely faulty.

Technician-level steps:

• 5. Inspect sensor harness: With the cover removed, locate the humidity or cavity temperature sensor and check that its connector is fully seated on the control PCB.
• 6. Test sensor resistance: For NTC temperature sensors, measure resistance at room temperature and compare to Sage specifications. Replace if out of range.
• 7. Replace sensor: If cleaning and harness checks do not resolve the error, replace the humidity or temperature sensor with a Sage-compatible part.

If the error persists after cleaning and reset, a sensor or control board replacement by a professional is usually required.