110
RTAA-IOM-3
Table 18
Diagnostics and Troubleshooting Chart
In the table below, a “LATCHING” diagnostic is a condition which shall cause the machine or a portion of the machine as
noted to shut down and shall require a manual reset to restore operation. A diagnostic that is non-latching shall reset
automatically when the condition causing the diagnostic goes away. A non-latching diagnostic shall shut down the machine
or a part of the machine if so indicated. If a diagnostic is informative only, no machine or circuit action is taken except to load a
diagnostic code into the last diagnostic register.
Diagnostic Types (And Action)
MMR = Machine Shutdown, Manual Reset
MAR = Machine Shutdown, Auto Reset
CMR = Circuit Shutdown, Manual Reset
CAR = Circuit Shutdown, Auto Reset
IFW = Information/Warning
DIAG.
ACTIVE
CODE DIAGNOSTIC DESCRIPTION TYPE MODES CAUSE
87 External Chilled Water IFW All a. Not “Enabled”: No Diagnostics Setpoint
b. “Enabled”: Out-of-Range Low, set diagnostic.
Out-of-Range Hi, no diagnostic.
89 External Current Limit IFW All a. Not “Enabled”: No Diagnostics Setpoint
b. “Enabled”: Out-of-Range Low, set diagnostic.
Out-of-Range Hi, no diagnostic.
8A Chilled Water Flow MMR Any Circuit a. The entering evaporator water fell (Ent. Wtr. Temp.)
Energized below the leaving evap. water temp. by more than
2 F for 100 F-seconds.
b. Causes to trip this diagnostic loss of chilled water
flow or a calibration shift in the evap. water temp.
sensors.
8E Evap. Entering Water Temp. Sensor MMR All Open or Short
8F Cond. Rfgt. Temp. Sensor - Ckt 1 CMR All Open or Short
90 Cord. Rfgt. Temp. Sensor - Ckt 2 CMR All Open or Short
93 Evap. Rfgt. Temp. Sensor - Ckt 1 CMR All Open or Short
94 Evap. Rfgt. Temp. Sensor - Ckt 2 CMR All Open or Short
9A Cord. Entering Wtr. Temp. Sensor IFW All Shorted condenser temperature sensor
(no diagnostic on open circuit).
9b Cond. Leaving Wtr. Temp. IFW All Shorted condenser temperature sensor
Sensor (no diagnostic on open circuit).
AO Zone Temperature Sensor IFW All Open or Short
a. Use end of range value (whatever value the open or
short gives).
(Zone Reset Selected) b. Clear diag. when the resistance returns to normal
range.
c. If Shorted, go into the ice making mode if
“Ice Machine Control” is enabled.
Zone Temperature Sensor None All a. If Open, do normal chiller control .
(Zone Reset Not Selected) b. If Shorted, go into the ice making mode if “Ice
Machine Control” is enabled.
A1 Outdoor Air Temp. Sensor IFW All Open or Short
(Either Outdoor Air Reset a. Use end of range value (whatever
or Low Ambient Lockout value the open or short).
Selected) b. Clear diag. when the resistance returns to
normal range.
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