What does it mean when my Whirlpool Hybrid Electric Heat Pump Water Heater displays “-”,”–”,”—” on the user interface?

INDICATES: Unit is doing a system diagnostic.

What To Do: No action is necessary. When first started, the water heater takes about 8 minutes to complete a diagnostic routine. This is a standard procedure to ensure the system is functioning correctly. If the system diagnostic yields any other codes, you should reference the Diagnostic Code section in the manual.