PO error keeps coming up.

I have attached a tech sheet for your model number

Hello
See the complete diagnostic manual link below. The ( PO) Error is a power out message.Press the ‘measured fill’ button on the front panel for 2-3 seconds. It is right below the word ‘confirm’ on the display. It makes you confirm that you know the power went out so you don’t eat any refrozen food. I would then run the unit through diagnostics. Matt Ace technician

To ENTER SERVICE DIAGNOSTICS Mode:
Press SW1 and SW2 simultaneously for 3 seconds. Release both buttons when you hear the CHIME
indicator. Unit must not be in Lockout prior to entering SERVICE DIAGNOSTIC MODE.
The display will show 01 to indicate the control is in step 1 of the diagnostics routine.

To EXIT SERVICE DIAGNOSTICS Mode: do one of the following 3 options:
• Press SW1 and SW2 simultaneously for 3 seconds.
• Disconnect the product from power.
• Allow 20 minutes to pass.
• Following the exit of the diagnostic mode, the controls will then resume normal operation