What Does Monogram Microwave Error Code 18 Mean?
The error code 18 (sometimes displayed as “Power Watch”) on a Monogram microwave indicates an electronic control issue. This error signals that the microwave’s control board has detected an internal electronic fault that prevents normal operation. Unlike PF or 888 which are informational, error 18 indicates a hardware problem requiring professional service.
Common Causes of Error Code 18
- Main control board failure – A failed capacitor, relay, or processor component on the main control board.
- Power surge damage – Voltage spikes damaging the control board’s electronic circuits.
- Overheating of control electronics – Inadequate ventilation causing the control board to overheat.
How to Troubleshoot Error Code 18
- Reset the microwave – Unplug for 5 minutes (longer than a standard reset), then restore power. A temporary electronic glitch may clear.
- Check ventilation – Ensure the microwave vents are clear and the installation has adequate air clearance.
When to Call a Professional
Error code 18 typically requires professional diagnosis of the control board. Contact our Monogram microwave repair team at 844-752-7887 for expert diagnosis and control board replacement using factory-certified Monogram parts.