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PCA
Instruction 24-9351
7.2 Error Codes
If one of the following messages appear at the bottom of the Sensor Status
Screen, 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.
TL-SENSOR ERROR Room air thermocouple is outside the
range of –20 to 100 °C (–4 to 212 °F)
TA-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 –7.5 to +7.5 mb
(– 3 to +3inches of water column)
LOW BATTERY Battery voltage has dropped below 3.9 volts.
The instrument will shut off when battery
voltage drops below 3.5 volts.
“– – – –” Not calculated (O
2
above 18.8%,
or the temperature is above 1200 °C
(2192 °F), or sensor error
“* * * *” Sensor not installed
“XXXX” Overrange (numeric)
7-2
Troubleshooting