Watlow PM LEGACY™ Limit Controller • 102 • Appendix
Chapter 9: Appendix
Troubleshooting Alarms, Errors and Control Issues
Indication Description Possible Cause(s) Corrective Action
Alarm won’t
clear or reset
Alarm will not clear or
reset with keypad or
digital input
• Latching is active
• Alarm set to incorrect out-
put
• Alarm is set to incorrect
source
• Sensor input is out of
alarm set point range
• Alarm set point is incorrect
• Alarm is set to incorrect
type
• Digital input function is in-
correct
• Reset alarm when process
is within range or disable
latching
• Set output to correct alarm
source instance
• Set alarm source to correct
input instance
• Correct cause of sensor in-
put out of alarm range
• Set alarm set point to cor-
rect trip point
• Set alarm to correct type:
process, deviation or power
• Set digital input function
and source instance
Alarm won’t
occur
Alarm will not activate
output
• Silencing is active
• Blocking is active
• Alarm is set to incorrect
output
• Alarm is set to incorrect
source
• Alarm set point is incorrect
• Alarm is set to incorrect
type
• Disable silencing, if re-
quired
• Disable blocking, if required
• Set output to correct alarm
source instance
• Set alarm source to correct
input instance
• Set alarm set point to cor-
rect trip point
• Set alarm to correct type:
process, deviation or power
Alarm Error
AL.E1
AL.E2
AL.E3
AL.E4
Alarm state cannot
be determined due to
lack of sensor input
• Sensor improperly wired or
open
• Incorrect setting of sensor
type
• Calibration corrupt
• Correct wiring or replace
sensor
• Match setting to sensor
used
• Check calibration of con-
troller
Alarm Low
AL.L1
AL.L2
AL.L3
AL.L4
Sensor input below
low alarm set point
• Temperature is less than
alarm set point
• Alarm is set to latching and
an alarm occurred in the
past
• Incorrect alarm set point
• Incorrect alarm source
• Check cause of under tem-
perature
• Clear latched alarm
• Establish correct alarm set
point
• Set alarm source to proper
setting
9
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