Troubleshooting7.2 Error CodesPCAIf one of the following messages or symbols is displayed, refer to Section7.3 Troubleshooting Guide for information on how to correct the error.O2 - SENSOR ERROR O 2 Sensor not connected, or is expired, orwas exposed to combustion gases duringwarmup.CO - SENSOR ERROR Carbon Monoxide sensor is expired, or wasexposed to Carbon Monoxide duringwarmup.NX - SENSOR ERROR Nitric Oxide sensor is expired, or wasexposed to Nitric Oxide during warm up,or the bias battery is dead.TA-SENSOR ERROR Room air thermocouple is outside therange of –20 to 100 °C (–4 to 212 °F)TS-SENSOR ERROR Flue Gas thermocouple is not connectedor is outside the range of –20 to 1200 °C(–4 to 2192 °F)DRAFT-SENSOR ERROR Outside the range of – 3 to + 3 inches ofwater column (–7.5 to +7.5 mb)LOW BATTERY Battery voltage has dropped below 3.9 volts.The instrument will shut off when batteryvoltage drops below 3.5 volts.BAD CALIBRATION ENTRY An attempt was made to enter a calibrationvalue that was outside the analyzer’s accept-able limits“– – – –” Not calculated (O 2 above 16%, or stacktemperature above 1000 °C (1832 °F)).“* * * *” Sensor not installed or sensor error“XXXX” Overrange (numeric)7-2 Instruction 0024-9219
