Sensor failure mode - PENN Controls - LIT-12012249 - A421ABT - A421AET - Electronic Temperature Control - A421 Series Electronic Temperature Control

A421 Series Electronic Temperature Controls with Cycle Timer Product Bulletin
Product
Controls > Electromechanical Temperature Controls > A421 Series Electronic Temperature Control
Document type
Product Bulletin
Document number
LIT-12012249
Revision date
09/01/2023

The sensor failure mode defines how the A421 control operates the equipment if a sensor or sensor-wiring failure occurs. You can set the control to run the equipment continuously or to shut it down. When a failure is detected, SF flashes alternately with OP on the LCD if the sensor circuit is open, or SF and SH if the sensor circuit is shorted.