6-6 | Thermox TM2000 Oxygen Analyzer
Temp Rise Failure
This indicates that the sensor has failed to increase a minimum of 10° C in
a 60-second time frame during start-up. Once the system reaches the op-
erating temperature set point, this message will appear only if the sensor
falls below the set point by 15° C and fails to recover within 60 seconds.
The problems that can cause this error are as follows:
AC line power problem at the sensor
Open furnace
Over-temperature protection circuit trip on the sensor board
Sensor board failure
Loss of furnace drive signal from control unit
Thermocouple failed (shorted or opened)
Interconnecting wiring problem
Polarity of thermocouple is incorrect
T/C (Thermocouple) Circuit Failure
This message appears when the control unit recognizes a sudden drop in
temperature (greater than 100° C). The thermocouple circuit failure mes-
sage can be the result of one of the following problems:
Shorted thermocouple
Faulty interconnecting wiring
Control unit display module failure
Sensor board failure
If this message is soon followed by a “Thermocouple Failure” message, see
that message for troubleshooting instructions.
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