Safety: Unplug the Argo unit before accessing the control panel or internal boards.

Steps:

Access control panel: Remove the top or front bezel to expose the display/control PCB. Take care not to damage the plastic clips.
Check ribbon cable: Locate the multi-wire or flat ribbon cable connecting the display board to the main PCB. Ensure both ends are fully seated and locked.
Inspect for damage: Look for kinks, cuts, or burn marks on the cable. If any conductor appears broken, replace the Argo display-to-main PCB harness.
Clean connectors: If there is visible oxidation, gently clean the connector contacts with electronic contact cleaner and allow to dry completely.
Board substitution (if available): If you have access to a known-good display board or main PCB from the same model, swap one at a time to identify the faulty board.
Replace defective board: Install a new Argo display PCB or Argo main control PCB as indicated by testing. Ensure all stand-offs and insulators are in place.
Reassemble and test: Refit the panel, restore power, and verify that E6 no longer appears and all buttons respond correctly.

Display shows E6 and the unit will not start or stops unexpectedly.

Possible Causes