Watlow Series 998 - Manual (Page 109)

Error Code Actions
Error codes [`Er3], [`Er4], [`Er5] or [`Er9] will result in these con-
ditions
• The control is in Auto operation with both control outputs off.
• The alarm outputs are in their alarm state (de-energerzed with the indi-
cator light on).
• The lower display is blank.
• The upper display indicates the error code.
• All keys are inactive.
• [`Er5] resets all Setup Menu prompts to their default values.
• The above conditions occur regardless of the value of [FAIL] or the
presence of the Setup or Factory menus
Cycle power to the control. If the error is still present contact the factory.
Percent Output Level with [FAIL] not set to [bPLS]
Heat Cool
[FAIL] set 1% to 100% [FAIL] setting 0%
[FAIL] set -100% to -1% 0% [FAIL] setting
Error Codes
WATLOW Series 998 User’s Manual 7.7 Tuning, Alarms and Error Codes, Chapter 7
Error codes other than [`Er3], [`Er4], [`Er5] or [`Er9] will result in
these conditions:
• If [FAIL] is set to [bPLS] (Global Menu)...
...and the control was in auto operation when the error occurred, it goes
into manual (% power) operation. If the output power is less than 75%
(±5%) power, and there was a change in power (< 5%) within the last
two minutes, the 998 switches into manual operation at the last auto-
matic power level (bumpless transfer). If the control was in manual
operation, it remains there. (Press the Auto/Man key å once to see
the error code.) The error code is shown in the upper display for five
seconds and the lower display shows the % power. After five seconds
the upper display reverts to the [----] display.
If the control was operating with stable output values when the error
occurred, it continues to operate at those levels on a % power basis. If
output values were not stable,or the percent output was greater than
75%, the control outputs go to 0% power (off).
• If [FAIL] is not set to [bPLS] (Global Menu)...
...and the control was in auto operation when the error occurred, it goes
into manual (% power) operation. The power level is determined by the
[FAIL] value (-100 to 100%). See the table.