Microwave displays H98 and does not heat; fan and light may still operate.

Critical safety warning: High-voltage components (magnetron, inverter, transformer, capacitor) can retain lethal charge. Do not attempt internal high-voltage repairs unless you are trained and have proper tools.

• Basic reset: Unplug the Viking microwave for 10–15 minutes, then restore power and test. If H98 returns immediately, internal HV components are suspect.
• Check ventilation and load: Ensure vents are clear and you are using a proper microwave-safe load (e.g., a cup of water) when testing. Running empty can damage the magnetron.
• Visual inspection: With power disconnected and cabinet removed, visually inspect the inverter board and magnetron for burn marks, cracked ceramic insulators, or melted connectors.
• Professional diagnosis: Because of the danger, have a Viking-qualified technician test the magnetron, inverter, and HV transformer/capacitor.
• Component replacement: Common repairs include replacing the Viking inverter board and/or magnetron. Always use OEM-rated parts and ensure all grounds and shields are reinstalled.