Troubleshooting
7.2 Error Codes
PCA
If one of the following messages or symbols is displayed, refer to Section
7.3 Troubleshooting Guide
for information on how to correct the error.
O2 - SENSOR ERROR
O
2
Sensor not connected, or is expired, or
was exposed to combustion gases during
warmup.
CO - SENSOR ERROR
Carbon Monoxide sensor is expired, or was
exposed to Carbon Monoxide during
warmup.
NX - SENSOR ERROR
Nitric Oxide sensor is expired, or was
exposed to Nitric Oxide during warm up,
or the bias battery is dead.
TA-SENSOR
ERROR
Room air thermocouple is outside the
range of –20 to 100 °C (–4 to 212 °F)
TS-SENSOR
ERROR
Flue Gas thermocouple is not connected
or is outside the range of –20 to 1200 °C
(–4 to 2192 °F)
DRAFT-SENSOR
ERROR
Outside the range of – 3 to + 3 inches of
water column (–7.5 to +7.5 mb)
LOW BATTERY
Battery voltage has dropped below 3.9 volts.
The instrument will shut off when battery
voltage drops below 3.5 volts.
BAD
CALIBRATION
ENTRY
An attempt was made to enter a calibration
value that was outside the analyzer’s accept-
able limits
“– – – –”
Not calculated (O
2
above 16%, or stack
temperature above 1000 °C (1832 °F)).
“*
*
*
*”
Sensor not installed or sensor error
“XXXX”
Overrange (numeric)
7-2
Instruction 0024-9219
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