Oven does not heat at all in any mode; display works, interior light may work, but no heating elements energize.

Danger: The power board carries live mains voltage. Only proceed if you are competent with electrical safety. Always disconnect power at the breaker and verify with a meter.

• 1. Rule out elements and sensor: If none of the heating elements work but the fan and display do, the common supply from the power board is suspect.
• 2. Access the power PCB: Remove the oven from the cabinet and take off the top or rear cover to locate the main power/control board (often near the top front in Panasonic ovens).
• 3. Visual inspection: Look for burnt areas, cracked solder joints around large relays, or blown fuses on the board.
• 4. Check line fuse: With the board removed and power disconnected, test any onboard fuses for continuity. Replace only with the same rating and type.
• 5. Inspect heater relay: If you see heat discoloration or cracked solder around the heater relay, reflowing solder may temporarily restore function, but relay replacement or full board replacement is recommended.
• 6. Functional test (advanced): With the oven reassembled and safely powered, a technician can measure voltage at the heater outputs when a heating mode is selected. No output despite a call for heat confirms a board/relay fault.

Because of shock and fire risk, full power board replacement or relay replacement should generally be done by a Panasonic-authorized technician.