I have been encountering the error "Column temp h/w fault (5)" on a 2695 Alliance. I tried to ignore the alert and run a diagnostic test on the column heater. 5 seconds into the diagnostic test for the column heater, the test is interrupted by the error message.

The help manual suggests that this error means one of the following:

  • Broken communication to the heater
  • Circulating fan failure
  • Internal temperature exceeded the limit
  • I unplugged and re-plugged the column heater –not a connection problem.

    The internal fuse etc was checked and it looked fine too.

    When I try to switch off the heater and run the method, the same error message pops up.

    The column heater doesn't have a on/off switch, so there is no way to isolate the component or work without it.

    Please provide suggestions on how I can resolve this.

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