Microwave Medium Severity
F1 Appliance Error Code

Jenn-Air Microwave F1 Error: Temp Sensor Open

What Does Jenn-Air Microwave Error Code F1 Mean? Error code F1 on a Jenn-Air microwave indicates the cavity temperature sensor has an open circuit. This sensor is used for convection cooking modes and sensor-based auto programs. It monitors the air temperature inside the cavity to regulate cooking. Common Causes The sensor endures high temperatures during […]

By Sarah Mitchell Appliance Safety Researcher & Technical Editor

Quick Assessment

Answer to continue safely

Is it safe to keep using?

Maybe. Basic microwave heating typically still works. Convection and sensor functions will be unavailable until the sensor is replaced.

Can I reset the code?

Yes. A power cycle clears the error display. If the sensor is failed, the error returns when convection or sensor mode is attempted.

When to stop immediately?

Stop if you notice: Basic microwave heating also fails, Sparking inside the cavity.

Symptoms You May Notice

Convection mode will not activate

The convection bake or roast function refuses to start because temperature cannot be monitored.

Sensor cooking programs fail

Auto-sensor functions like reheat and popcorn do not work correctly.

Microwave stops mid-cycle

The unit halts during convection or combination cooking modes.

Possible Causes

1

Failed cavity temperature sensor

The thermistor sensor inside the microwave cavity has broken or failed from heat exposure.

Requires Professional
2

Sensor wiring issue

The wire connecting the sensor to the control board is damaged or disconnected.

Requires Professional

Safe Checks You Can Do

These checks are safe for homeowners. No disassembly required. Do not remove panels or access internal components.
  1. 1

    Power cycle the microwave

    Turn off the breaker for 5 minutes and restore power.

    Basic microwave heating may still work. Only convection and sensor functions are affected.

  2. 2

    Test basic microwave mode

    Heat a cup of water for 1 minute using manual power mode (not sensor mode).

    If manual microwave works, the magnetron is fine — only the sensor has failed.

When to Call a Professional

Contact a qualified technician if:

  • Sensor shows open circuit resistance
  • Wiring has visible damage
  • Sensor connector is corroded

Need Professional Help?

Find qualified technicians in your area for proper diagnostics and repair.

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More Microwave Error Codes

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F9 F6 F4 SE PF F8 F7 F3 F5 F2