Microwave displays E07 and will not start; sometimes accompanied by a relay click and immediate stop.

Safety first: Unplug the microwave. Internal control board work should be done only by those comfortable with electronics.

User-level checks:

• 1. Power cycle: Unplug for 10 minutes, then plug back in and test. If E07 appears immediately when starting any cycle, the control board is likely at fault.
• 2. Listen for relay clicks: When pressing START, listen for a click from inside the control area. A rapid click followed by E07 suggests a relay or its driver is failing.

Advanced checks (technician-level):

• 3. Inspect control board: Remove the control panel and examine the main PCB for burnt spots around the power relays.
• 4. Test relays: Using a multimeter, check coil resistance and continuity across the relay contacts when energized (requires safe test setup).

Recommendation: In most cases, the entire control board is replaced rather than individual relays, unless you have soldering skills and can source the exact relay.