Sensor failure mode - PENN Controls - LIT-12012249 - A421ABT - A421AET - Electronic Temperature Control - A421 Duty‐Cycle/Ventilation Models

A421 Series Electronic Temperature Controls with Cycle Timer Product Bulletin

Product name
A421 Duty‐Cycle/Ventilation Models
Document type
Product Bulletin
Document number
Revision date

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.