16
Error Messages and Troubleshooting
Model 101303-50
Symptom
Possible causes
Heater never heats; open
loop errors cannot be
avoided.
Check that heater is sized properly. If so, internal
transformer may have failed. Call factory.
Over-temperature alarm will
not clear.
This alarm limit has a two-degree hysteresis. The
process temperature must fall more than 2 °C below
the alarm set point before it can be cleared with the
reset key. This hysteresis may be overridden by
cycling power to the instrument once the process
temperature has fallen below the alarm limit.
Temperature fluctuates by
more than 1 degree.
Verify the unit has been autotuned in the current
thermal configuration and near the setpoint
temperature. If not do so.
Unit does not control. It
heats regardless of setpoint,
until alarm limit trips.
The solid-state relay may have failed. This is
unlikely unless the output has been shorted and the
semiconductor fuse did not properly function (blow).
Call factory.
Control module does not
display anything, or displays
but is not functioning
properly.
Check that circuit breaker is on, and line voltage is
present.
If so, disconnect power, remove cover, and ensure all
connectors on the back of the control module are
securely in place.
