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The temperature of the reactor (or column heater) jumps up and down. Sometimes the temperature display shows “EE1” What is wrong?

April 26, 2017column display heater jumps reactor shows temperature wrong

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The temperature of the reactor (or column heater) jumps up and down. Sometimes the temperature display shows “EE1” What is wrong?

1 Answer

0

10 Posted

These symptoms mean that the electronics has a bad or even broken connection to the temperature sensor. Usually this results from a bad cable harness between the temperature control module and the main printed circuit board. The quick fix is to remove the cable harness (take notes!), re-crimp the slip-on terminals, and re-install it. The replacement part is 1500-0707 for the older boards (rev.B) or 1500-0711 for the newer (rev.D). Less common causes include: 1) the reactor or heater is unplugged, 2) the sensor has a broken wire, 3) a bad printed circuit board, 4) a bad temperature controller, 5) a bad plug on the back of the temperature controller.