What Er20 Means
Er20 traces to the cooktop's touch controller itself — the capacitive touch interface board used to set power levels and select zones.
Common Causes of Er20
- The touch controller board has failed
- Moisture or a grease film interfering with the touch interface
- A loose connector between the touch controller and the power unit
🔧 One Safe Check You Can Try
Wipe the touch surface clean of any moisture, grease film, or spilled food that could be confusing the controller, then cycle power at the breaker.
⚠ Why You Shouldn't Go Further Than That
- Wipe down the surface without cutting power first and you're working right next to live control circuitry.
- It's easy to confuse this with a full power-unit failure and end up replacing the wrong, costlier part.
- A static discharge from bare hands during handling can damage the touch controller's circuit board.
- Put the control panel back together with a connector even slightly off and other zones or functions can stop responding entirely.
- The touch sensors are set at a fixed gap behind the glass, and once the panel has been apart they rarely return to that exact spacing, leaving keys that read unevenly.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.