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Table 9 – Controller Control Fault Logic
Fault
Alarm
Indication
Compressor
Shutdown
Pump
Shut Off
Alarm
Reset
Required
1
Manual
Reset
Required
2
Remote
Alarm
Activated
3
No Flow
LED
Yes
Yes
No
No
Yes
High Refrigerant Pressure
LED
Yes
Yes
Yes
Yes
Yes
Low Refrigerant Pressure
LED
Yes
No
Yes
No
Yes
Freezestat
LED
Yes
No
Yes
No
Yes
Low Oil Pressure
LED
Yes
Yes
Yes
Yes
Yes
Over Set Point
LED
No
No
No
No
Yes
Under Set Point
LED
Yes
No
Yes
No
Yes
Low Water Level
LED
No
No
No
No
No
High Water Temperature
LED
No
No
No
No
No
Probe Fault
LED
Yes
Yes
Yes
No
Yes
Low Power
Pr OFF
Yes
Yes
Yes
No
Yes
Pump Overload
Err 126
Yes
Yes
Yes
Yes
Yes
Compressor Overload
Err 127
Yes
Yes
Yes
No
Yes
High Temperature Safety
Err 128
Yes
Yes
Yes
No
Yes
1
Alarm Reset button or Stop button on control panel must be pressed.
2
Safety control must be manually reset before the controller can be reset.
3
Activates the alarm horn (if included) and closes the alarm contact (if included).
Diagnostic Error Codes
Several different error codes may show on the digital readouts labeled To Process and Set Point. Most of the
possible error codes indicate some type of failure in the microprocessor controller. If any error codes other than
the ones listed below occur, try to reset the unit by shutting the power off and then turning it back on. If this does
not work, make a note of the error code and contact our Customer Service Department for further assistance.
Table 10 - Diagnostic Error Codes
Error
Code
Description
Cause/Corrective Action
Pr Off
Brown Out Indication
Indicates the chiller is running and main power is disconnected or drops more
than 10% below the normal operating voltage, the unit will shut down and the
Pr OFF fault will show on the digital displays. Pressing the Power button will
clear this fault condition.
101
EEPROM Failure
Controller requires servicing. Contact Manufacturer for repair or replacement.
102
A/D Converter Failure
Controller requires servicing. Contact Manufacturer for repair or replacement.
103
Controller serial bus failure
Controller requires servicing. Contact Manufacturer for repair or replacement.
105
CJC Error
Controller requires servicing. Contact Manufacturer for repair or replacement.
109
Unused memory byte changed
Controller requires servicing. Contact Manufacturer for repair or replacement.
110
Device or communication configuration invalid
Controller requires servicing. Contact Manufacturer for repair or replacement.
111
Fixed parameter associated with range invalid
Controller requires servicing. Contact Manufacturer for repair or replacement.
112
Setpoint out of temperature range
Controller requires servicing. Contact Manufacturer for repair or replacement.
113
RAM hardware failure
Controller requires servicing. Contact Manufacturer for repair or replacement.
114
Invalid device configuration
Controller requires servicing. Contact Manufacturer for repair or replacement.
117
Invalid program counter
Controller requires servicing. Contact Manufacturer for repair or replacement.
118
Infinite software loop detect
Controller requires servicing. Contact Manufacturer for repair or replacement.
119
Data direction register failure
Controller requires servicing. Contact Manufacturer for repair or replacement.
120
Communication data register failure
Controller requires servicing. Contact Manufacturer for repair or replacement.
121
Timer data register failure
Controller requires servicing. Contact Manufacturer for repair or replacement.
122
Hardware watchdog data register failure
Controller requires servicing. Contact Manufacturer for repair or replacement.
123
Option data register failure
Controller requires servicing. Contact Manufacturer for repair or replacement.
125
Jumper for temperature controller missing
Indicates the jumper is loose or missing on the control circuit board.
126
Pump overload on chiller
Indicates the pump overload has tripped. In order to reset this fault; press the
Alarm Reset button after resetting the pump overload inside the electrical
enclosure.
