E4 - Microwave Oven Relay 4903 Error (F1)

What does E4 mean?

This error indicates a problem with the microwave oven's internal relay, specifically Relay 4903. This relay is crucial for the proper operation of the microwave functions.

• Malfunctioning Relay 4903 on the Microwave Appliance Manager.
• Faulty interlock switches (door switches).
• Loose wire connections to Relay 4903.
• Faulty Microwave Appliance Manager.

Click steps to track your progress.

1. 1

   Turn off the oven power at the circuit breaker, wait 10 seconds, then turn it back on.

2. 2

   Place a microwave-safe cup of water in the microwave cavity to provide a load.

3. 3

   Ensure the oven door interlock switches are working correctly: when the door is open, the microwave light should be on; when closed, the light should be off.

4. 4

   Start a microwave cooking function and allow it to run for 1 minute to check if the error reappears.

5. 5

   Enter Diagnostics mode by pressing CANCEL>CANCEL>START, then press the 3 or 6 keypad to scroll to the Faults screen and verify the E4 error code.

6. 6

   If the error persists after these checks, the Microwave Appliance Manager may need professional inspection.