M2B+ Controller
Chapter 6: Troubleshooting
This Troubleshooting section should be used in conjunction with the Troubleshooting section
of the unit that the controller was supplied with. The problems listed below are displayed on
the LCD and the action the user takes will depend on whether the alarm is critical or non-
critical.
Problem Possible Cause Solution
Alarm configuration is set up
incorrectly.
Change the configuration to
Low, High, High/Low, or
Event. See 5-4 on page 33.
Alarm Mode is configured
incorrectly
Change the Mode to either
Absolute or Deviation. See 5-4
on page 33.
Process Temperature Alarm
does not acknowledge when
Process Temperature is lower
than Setpoint
Alarm trip point incorrect set. Change the value of the high
or low tripping point for the
alarm. See 5-4 on page 33.
Alarm configuration is set up
incorrectly.
Change the configuration to
Low, High, High/Low, or
Event. See 5-4 on page 33.
Alarm Mode is configured
incorrectly
Change the Mode to either
Absolute or Deviation. See 5-4
on page 33.
Process Temperature Alarm
does not acknowledge when
Process Temperature is higher
than Setpoint
Alarm trip point incorrect set. Change the value of the high
or low tripping point for the
alarm. See 5-4 on page 33.
Remote input is not enabled.
Remote input is incorrectly
configured.
Change the value for “Remote
Input” in the Secondary Menu
to SETP.
Setpoint will not change with
a change of Remote Analog
Setpoint value, or setpoint
displays 0.
Remote Signal value is
incorrect.
Change the range for “Remote
Signal” to desired setting.
The status of the program has
been stopped.
Either Press the Run/Hold
button on the face of the
controller or change the value
of “Prog Ramp/Soak” in the
Secondary Menu to ON.
The segment setpoint is
incorrect.
Change the value of “Seg #
SetPoint” to desired
temperature.
Ramp/Soak program does not
transition to desired setpoint.
The program time is too short
for the heating/cooling
capacity of the unit.
Change the value of “Seg #
Time” to a longer timer
period.
Last setpoint in Ramp/Soak
program reverts back to first
setpoint
The Program End function is
incorrectly configured.
Change the value of “Prog
End” to HOLD.
Ramp/Soak program never
stops cycling through steps
The Program End function is
incorrectly configured.
Change the value of “Prog
End” from LOOP to desired
action at the end of program.
Chapter 6: Troubleshooting 53 of 65
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