15
Error Messages and Troubleshooting
Model 101303-50
Error Messages and Troubleshooting
Error messages
The control module is capable of displaying a number of errors and alarm
conditions. These messages are described below. For more details, consult the
Watlow
®
Series 96 Manual.
Message
Meaning and Corrective Action
flashing in upper
display
Recorded process temperature has exceeded alarm
limit (over-temperature setpoint). Check value of
alarm limit and integrity of sensor. When the process
temperature falls more than 2 °C below the alarm
limit, clear the error by pressing the reset key.
Alternatively, this alarm may be cleared by cycling
power to the instrument once the process temperature
has fallen below the alarm limit.
flashing in upper
display
Open loop error. The controller has been outputting
100% power but its sensor temperature is not
changing. Verify that the sensor is located properly
and that the heater is connected and functioning
properly. This error is cleared by cycling power to
the unit.
This error indicates a thermal system
malfunction -- do not ignore it!
flashing in upper
display
System is autotuning (this only occurs when initiated
manually by the user). No action is necessary,
although autotuning sequence may be terminated by
setting
parameter to
in main menu.
,
,
, or
in upper display
Sensor errors. Verify sensor connections and
continuity. Unit will continue to display error
condition until power is cycled or error is cleared by
pressing the infinity key
through
in
upper display
Internal module errors, not normally seen. Cycle
power to unit, and if problem persists call factory.
Troubleshooting
Below are some tips to resolve problems not identified by the standard error
messages:
Symptom
Possible causes
Displayed temperature goes
down when heaters turn on.
Thermocouple leads reversed. Shut off power
immediately and check wiring of sensor.
Circuit Breaker trips
Check that heater is sized properly. The Model
101303-50 will not deliver more than 15 Amps.
Check that the heater power is not shorted to ground
anywhere in the system.
