Time/Temperature Control Series 733/734 - Watlow

Error CodesProblem Probable Cause SolutionEr10 -Stack overflow errorMicroprocessor error• Cycle powerTable 2 -ContinuedEr11 -Zone 1 open sensor errorOpen sensor• Check the InP1 parameter.Verify itmatches your sensor.˜NOTE:For Er10 throughEr14, first checkthe sensor andconnections for areversed or opensensor beforetrying the solutionlisted.˜NOTE:Er06 through Er09,and Er11 throughEr14 are selfclearing errors ifthe condition thatcaused the alarmhas been takencare of.Er12 -Zone 1 shorted sensorEr13 -Zone 2 Open sensorEr14 -Zone 2 shorted sensorEr15 -Zone 1 loop error• Incorrect sensor type• Measuring temperatureoutside the sensorrangeOpen sensor• Incorrect sensor type• Measuring temperatureoutside the sensorrange• Reversed sensor leads• Faulty heater or gasvalve• Shorted sensor• Faulty output switchingdevice• Blown fuse to heater• Incorrect Pb1 valuefor thermal system• Check the InP1 parameter.Verify itmatches your sensor.• Check the InP2 parameter.Verify itmatches your sensor.• Check the InP2 parameter.Verify itmatches your sensor.• Check heater or gasvalve• Check sensor• Check output switchingdevice• Check fuse to heater• Auto-tune the controlEr16 -Zone 2 loop errorError Code ActionsSee Er15 ProbableCause above.• Incorrect Pb2 value forthermal systemSee Er15 Solution above.• Auto-tune the control• Error codes will result in these conditons:• The alarm outputs are in their alarm state (de-energized).• The display alternately flashes the process value and error code.• All keys are inactive except for the Temperature key . This key snoozes theerror code and display for 30 seconds.• The above conditions occur regardless of the LOC value, or the presence of theSetup, Service or Calibration Menus.• To clear a corrected error…• Cycle power to the control. OR• Enter the Program mode by pressing the keys simultaneously for3 seconds.• Press the Menu 12 key 12 once.• Press the Time key . The EC (Error Clear) prompt is displayed.• Press the Temperature key , and the error is cleared. Press the Time keytwice, and you're back to the Operation mode [0)º0].14 WATLOW Series 733/734 Program ManualAlarms & Error Codes, Chapter 5