CT Error (via PC Command Center) - Zone temperature not maintained

What does CT Error mean?

A Comfort Trend (CT) error is a transparent error detected by the slave thermostat, indicating difficulty in maintaining the desired temperature conditions in its zone. The thermostat does not display this error directly; it must be accessed and cleared using the PC Command Center software. It signifies that the zone temperature is not improving or is worsening over time.

• Insufficient airflow into the zone due to damper settings or ductwork issues.
• Incorrect configuration of the slave thermostat's Damper Maximum Open Position setting for pressure dependent zones.
• Incorrect configuration of the slave thermostat's Airflow Set Point for pressure independent zones.
• Loose connections, poorly insulated ductwork, or issues with the bypass controller.
• Supply-air fan not producing adequate air volume or static pressure.
• Supply air temperature being incorrect (too high during cooling, too low during heating).

Click steps to track your progress.

1. 1

   Check and adjust the Damper Maximum Open Position (rotary switch position 5) or balancing dampers for pressure-dependent zones. Set to 15 for full open.

2. 2

   Verify and adjust the Airflow Set Point for pressure-independent zones to a higher value, ensuring Damper Maximum Open Position is set to 15 and no balancing dampers reduce airflow.

3. 3

   Inspect the ductwork to the zone for loose connections or poor insulation that could reduce air volume or affect temperatures.

4. 4

   For VVT systems, check the bypass controller configuration to ensure it's not causing low system static pressure.

5. 5

   Verify the performance of the supply-air fan to ensure it produces adequate supply air and static pressure.

6. 6

   Check the temperature of the airflow into the zone; if it's outside design conditions, inspect the main equipment operation.