Watlow F4T - Page 37

Watlow F4T Install & Troubleshooting • 34 • Chapter 5 Troubleshooting
Indication Description Possible Cause(s) Corrective Action
Alarm Low 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
temperature
• Clear latched alarm
• Establish correct alarm
set point
• Set alarm source to
proper setting
Alarm High Sensor input above
high alarm set point
• Temperature is greater
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 over
temperature
• Clear latched alarm
• Establish correct alarm
set point
• Set alarm source to
proper setting
Error Input Sensor does not
provide a valid sig-
nal to controller
• Sensor improperly wired
or open
• Incorrect setting of sen-
sor type
• Calibration corrupt
• Correct wiring or re-
place sensor
• Match setting to sensor
used
• Check calibration of
controller
Limit won’t
clear or reset
Limit will not clear
or reset with key-
pad or digital input
• Sensor input is out of
limit set point range
• Limit set point is incor-
rect
• Digital input function is
incorrect
• Correct cause of sensor
input out of limit range
• Set limit set point to
correct trip point
• Set digital input func-
tion and source instance
Limit Error Limit state cannot
be determined due
to lack of sensor
input, limit will trip
• Sensor improperly wired
or open
• Incorrect setting of sen-
sor type
• Calibration corrupt
• Correct wiring or re-
place sensor
• Match setting to sensor
used
• Check calibration of
controller
Limit Low Sensor input below
low limit set point
• Temperature is less than
limit set point
• Limit outputs latch and
require reset
• Incorrect alarm set point
• Check cause of under
temperature
• Clear limit
• Establish correct limit
set point
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