Applicable Systems
RTAC 200
Symptoms
CO2 sensor fault. The controller cannot read the CO2 level correctly.
Possible Causes
- CO2 sensor element failure or end of life
- Sensor wiring or communication fault
Troubleshooting Steps
- Step 1: Check the sensor wiring and calibration
Wiring is secure but reading is abnormal - Step 2: Replace or recalibrate the CO2 sensor
Sensor reads correctly after replacement
How to Reset
To reset: Replace or recalibrate the sensor and power-cycle the controller.
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Source: Trane HVAC Service Manual, Trane Inc.
Category: HVAC Residential
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