Sometimes the EC can retain an electrical glitch, and the result can be some programming anomalies such as the freezing of the AM/PM adjustment. Be sure the controllers programming dial is in the AUTOMATIC position before performing this reset procedure:
- Press and hold down the
, 
, and 
buttons. - Press and release the RESET button located in the lower wiring compartment.
- Release the , and buttons. The display should now show 12:00 am. All the memory has been cleared and the controller may now be reprogrammed.