Hobart dishwasher displays E10; communication error between user interface and main control.

Safety first: Disconnect power before removing the control panel or accessing electronics.

• Inspect UI connections: Remove the front control panel and locate the ribbon cable or harness connecting the user interface to the main board. Ensure it is fully seated and not pinched or damaged.
• Check for corrosion: Look for corrosion on connector pins caused by steam or chemical exposure. Clean lightly with contact cleaner if needed.
• Secure grounding: Verify that the dishwasher chassis is properly grounded and that ground wires are tight. Poor grounding can cause communication errors.
• Test after reseating: Reassemble, restore power, and test operation. If E10 returns, either the UI board or main control board may be defective.
• Professional diagnosis: Component-level diagnosis of communication faults typically requires Hobart service tools and should be performed by a technician.