Watlow Series 998 - Manual (Page 108)

Error Code E1 and E2 Messages
Four dashes, [----], in the upper display indicate a Series 998 error. The
associated channel goes to 0% output. To view the error code press the
Auto/Man key once. The upper display shows the error code for five sec-
onds before returning to the [----] display.
[E1`1] or [E2`1]: A/D underflow error
The input 1 or 2 A/D circuit is underrange. An open or reversed polarity
sensor is the most likely cause. Check the sensor; if the connection is
good, and functions properly, call the factory. Make sure input settings,
in the Input Menu, match your sensor.
[E1`2] or [E2`2]: Sensor underrange error
The input 1 or 2 sensor generated a value lower than that allowed for the
range of the sensor, or the A/D circuitry malfunctioned. Enter a valid
input. The A/D value is below the range limits, but within the A/D con-
version limits. Make sure input settings, in the Input Menu, match your
sensor.
[E1`3] or [E2`3]: Sensor overrange error
The input 1 or 2 sensor generated a value higher than that allowed for
the range of the sensor, or the A/D circuitry malfunctioned. Enter a valid
input. The A/D value is above the range limits, but within the A/D con-
version limits. Make sure input settings, in the Input Menu, match your
sensor.
[E1`4] or [E2`4]: A/D overflow error
The input 1 or 2 A/D circuit is overrange. An open or reversed polarity
sensor is the most likely cause. Check the sensor; if the connection is
good, and functions properly, call the factory. The A/D input voltage is
too high to convert an A/D signal. Make sure input settings, in the Input
Menu, match your sensor.
[`Er3]: Ambient temperature error
The ambient temperature of the Series 998 has dropped below 32°F/0°C
or risen above 149°F/65°C. A calibration error can also cause the error
code. Try a calibration restore to clear this alarm.
[`Er4]: RAM verification error
An internal RAM failure has occurred. Contact the factory.
[`Er5]: Non-volatile checksum error
Displayed when an EEPROM checksum error has been detected. Turn the
power off then back on again. If the error has not cleared, contact the fac-
tory.
[`Er9]: Configuration error
An incorrect module was installed in the control. Contact the factory.
Error Codes
Tuning, Alarms and Error Codes, Chapter 7 7.6 WATLOW Series 998 User’s Manual
NOTE:
An alarm display
will be masked by
an error condition
or when the con-
trol is in the
Calibration or
Setup menus.