Watlow Controls
5
EHG CL User’s Guide
EHG CL Error Codes (cont.)
Display
Description Possible
Cause
Corrective
Action
[Ahi]
Alarm High
Process temp exceeds set point by
value greater than alarm high setting
•
Set HTA value to correct high
temperature alert value
[Alo]
Alarm Low
Process temp below set point by value
greater than alarm low setting
•
Set LTA value to correct Low
temperature alert value
[E91]
Communications Queue
Full
Communications buffer overfl ow
•
Contact Technical Support at
1-507-494-5656
[E10]
EEPROM Error
EEPROM memory space fails CRC
check (checksum for parameter space)
•
Contact Technical Support at
1-507-494-5656
[E11]
CRC Error
Flash memory space fails CRC check
(checksum for program space)
•
Contact Technical Support at
1-507-494-5656
[E12]
CPU Clock Error
Clock frequency is < 5 MHz or > 13.1
MHz
•
Contact Technical Support at
1-507-494-5656
[E13]
Stack Overfl ow
Stack has overfl owed
•
Contact Technical Support at
1-507-494-5656
[E15]
AI Function Error
Analog reference is < 1.82 or > 2.06
volts
•
Contact Technical Support at
1-507-494-5656
[E16]
Process Comparison
Error
Limit and control sensor readings
differ by value greater than process
comparison value
•
Check setting of Proces Com-
parison Value
•
Set Process Comparison Value
to correct value
•
Check wiring of sensors
[E17]
Data Store Error
Data store functions are not set up
•
Check setting of Process Com-
parison Value
•
Check wiring of sensors
[E20]
Base control fi rmware
ID not supported
Base control fi rmware is not compat-
ible with Display Module fi rmware
• Check
fi rmware compatibility
between Base Control and
Display Module. Revision 20.0
and greater for Base Control
and Display Module are com-
patible for EHG2-AAAA-0000.
