Specifications

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