Carbolite 3216OT - Manual (Page 6)

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2.4 Over-Temperature Alarm
If an over-temperature condition occurs, the OP2 indicator flashes, and an alarm message
2FSH also flashes, alternating with the setpoint. Power to the heating elements is
disconnected.
2.5 Resetting the Over-Temperature Alarm
To acknowledge the alarm press Scroll and Page together.
If the alarm is acknowledged while there is still an over-temperature condition, the OP2
indicator stops flashing but continues to glow. The 2FSH alarm continues to flash until the
over-temperature condition is cleared (by the temperature falling), when normal operation
resumes.
If the alarm is acknowledged when the temperature has dropped (or after the over-
temperature setpoint has been raised) such that the over-temperature condition no longer
exists, then the furnace or oven immediately resumes normal operation.
2.6 Sensor Break
The over-temperature cut-out system also operates if the over-temperature control
thermocouple breaks or becomes disconnected. The message S.br flashes instead of
2FSH.
3 Audible Alarm
If an audible alarm is supplied for use with the over-temperature controller, then it is
normally configured to sound on over-temperature condition, and to stop sounding when the
alarm is acknowledged as given in section
‘2.5 Resetting the Over-Temperature Alarm’.
Note that the alarm may sound during controller start-up.
It is not possible to cover in this manual other possible alarm features which may be
included by customer special order.