Navigating the Basic and Advanced menus - PENN Controls - A421ABD - A421AED - Electronic Temperature Control - A421 Off‐Cycle Defrost Model

A421 Series Electronic Temperature Controls with Off-Cycle Defrost Installation Guide

Product name
A421 Off‐Cycle Defrost Model
Document type
Installation Guide
Document revision
Revision date

About this task

The A421 Control buttons and display operate the same way in the Basic and Advanced menus. The parameter code flashes on and off in any parameter code screen.


  1. To navigate through all of the parameter code screens, press Down or Up.
  2. To exit either menu and return to the Main screen, press Down and Up simultaneously.
  3. While in any parameter value screen, the parameter value flashes on and off.
  4. To scroll through all of the available parameter values for the associated parameter code, press Down or Up.
  5. With the preferred parameter value displayed, press MENU to save the value and go to the next parameter code screen.
    Note: If you do not press MENU to save a new value, the control reverts to the last saved value. After 30 seconds of inactivity, while in any screen, the control reverts to the Main screen.