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CO Life Left Monthsmaintenance

Edwards EST EST4: CO Life Left Months

Edwards EST EST4·0 views·0 field notes

What This Code Means

The Carbon Monoxide sensing element in a detector is nearing the end of its expected life.

Common Causes

  • 1Natural expiration of the CO sensor
  • 2End of 6-10 year service life

Resolution Steps

Replace the CO detector or the CO sensor module as the device is no longer capable of reliable detection.

Manual References(2)

Field Notes

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Related Codes

Insufficient voltageThe power supply voltage has dropped below the minimum operating threshold.Maintenance Not CleanAn addressable smoke detector has reached a contamination level of 80% or greater and is at high risk of false alarm.Low impedanceThe circuit resistance is lower than expected but not a direct short.Load deficiencyThe power supply has detected that the batteries cannot support the required system load.High impedanceThe circuit resistance is higher than the main impedance setting, indicating a poor connection.

Related Questions

What are the battery sizing requirements for the EST4, and what is the replacement procedure?How many addressable devices can an EST3 node support, and what cards provide the SLC loops?How do I decode an EST3 trouble address like '03030681'?
All EST4 trouble codesEST4 panel page