12
Diagnostic Error Codes
Several different error codes may be displayed 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. Below is a list of the error codes. If there
are any error codes other than the one listed below, 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 6 - Diagnostic Error Codes
Error
Description
Cause/Corrective Action
Pr Off
Brown Out Indication
The Pr Off code will be indicated on the display if the chiller is running and main power is discontinued or
drops more than 10% below the normal operating voltage, the unit will shut down and the Pr OFF fault will
be indicated 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 change or 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
The Err 125 fault code will be indicated on the digital displays if the jumper is loose or missing on the
control circuit board.
126
Pump overload on chiller
The Err 126 fault code will be indicated on the digital displays if 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.
127
Compressor overload on chiller
The Err 127 fault code will be indicated on the digital display if the internal compressor motor winding
thermostat or the external compressor motor overload has tripped. This fault will also shut off the pump.
The internal compressor motor winding thermostat will automatically reset when the temperature drops
back into the normal operating range. The external compressor motor overload must be manually reset.
The compressor motor overload is located inside the electrical enclosure. Once the internal compressor
motor winding thermostat resets and/or the external compressor overload has been reset, press the
Alarm Reset button to reset the fault.
128
Chiller high temperature safety
The Err 128 fault code will be indicated on the digital displays if the chiller has been shut off due to the
high temperature safety. This safety will shut off both the pump and compressor. This safety is triggered
if the To Process temperature rises more than 10°F (5.5°C) above the maximum operating temperature for
that particular chiller. The maximum operating temperature for each chiller is noted on the nameplate.
The To Process temperature must be over the limit for three minutes before this safety will be triggered,
and the fault is defeated for a period of thirty minutes from the time the Start button is pressed or the Set
Point temperature is changed. Pressing the Alarm Reset button will reset this fault.
129
Input Contact Chatter
