Microwave shows H1 and cancels sensor cooking programs.

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Overheated cavity due to long cooking,Blocked vents causing high internal temperature,Faulty humidity/temperature sensor,Control board misreading sensor

How to Fix / Troubleshooting

Safety first: Unplug the microwave if there is any sign of smoke or burning smell.

Steps:

Allow cooling: Open the door and let the microwave cool for at least 30 minutes. Ensure vents are not blocked.
Clean interior: Remove heavy grease and food residue from the cavity, especially near the sensor opening.
Test non-sensor modes: Try manual time/power cooking. If only sensor modes fail with H1, the sensor is suspect.

Technician repair:

Test the sensor assembly and replace if readings are out of range.
Check for proper airflow and fan operation.

Repair Difficulty

Medium 3/5

Required Part

Sensor Assembly

Check Price on Amazon

We may earn a commission from links on this page.