Troubleshooting | 5-9
Alarm and Warning Messages
ALARMS
ALARM DESCRIPTION Possible Causes
Cell T/C Failure Thermocouple is not connected or is open Bad T/C, Bad connection
Cold Junction Compensator
Failure
The PCB temperature sensor has failed Bad Electronics
Cell Temperature Control A critical overtemperature condition has
occurred
Shorted, open, or Bad
T/C or Failed Temperature
Control Circuit.
Unit must be reset to clear
this alarm
Cell Over Temp Cell temperature is 4 degrees or higher
above the setpoint
Bad Thermocouple, Failed
temperature control circuit
Cell Under Temp Cell temperature is 4 degrees or lower
below the setpoint
Faulty heater, faulty heater
connection, Faulty T/C,
Faulty T/C connection,
Low Power.
Only after warm-up is
complete
Cell Temp Rise Failure Cell heater failed to heat the cell Bad Cell furnace heater,
Bad heater connection,
Shorted T/C, Bad T/C con-
nection.
Unit must be reset to clear
this alarm
Over Temp Relay Tripped The cell over-temperature relay has tripped Open Thermocouple, Over
Temperature condition,
Failed Temperature control
circuit.
Must cycle power to reset
the relay
RTD Failure The Box Temp RTD Failed Open or Shorted RTD
Box Temp High Box temperature is 4 degrees or higher
above the setpoint
Failed temperature control
circuit
Box Temp Low Box temperature is 4 degrees or lower
below the setpoint
Faulty heater, faulty heater
connection, Faulty RTD,
Faulty RTD connection,
Low Power.
Only after warm-up time
expires
Box Temp Rise Failure Box temperature failed to heat Bad box heater(s), Bad
heater connection, Bad
RTD, Bad RTD connection
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