Why does my fan growl when I turn the knob all the way down?

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• Why does my fan not run at full speed when I turn the knob all the way up?

  You may need to increase the High Limit trimmer. For more information, see Limits for 120/230 VAC fans in the user manual.

• Why does my fan stop when in Idle mode?

  The idle mode setting may be too low. Turn the Temperature knob fully clockwise. Turn the Idle Speed knob to the minimum fan speed desired. Turn the Temperature knob to the desired temperature.

• How do I ensure my fan never turns off?

  First adjust the OSB trimmer all the way clockwise to ensure it's set to IDLE. Then, if it still shuts off, it's because your idle speed is not high enough. Increase this setting, to ensure fan spins instead of just humming.

• Why does my heater/fan not turn on when I expect it to?

  Verify the temperature sensor is good. Verify the mode is correct. Verify the set point.

• Fans turn off and actuators close when zone temperature rises

  Problem Fans turn off and actuators close when zone temperature rises Possible Cause Tunnel mode is active Possible Solution Set tunnel turn off to "No" for stages you do not want affected by tunnel mode.