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TROUBLESHOOTING
Problem/Symptom
No power
Unit doesn't turn on with
airflow
Unit doesn't turn off with no
airflow
Ozone LED light is not turning
on
Germicidal LED light is not
turning on
Ozone LED light is blinking
10 • Pentair® ComAir 20T Installation and Operation Guide
Possible Cause
• No power to system
• Fuse blown
• No airflow present
• Airflow sensitivity needs adjustments
• Unit is on
• Airflow sensitivity needs adjustment
• No airflow present
• Blue shutdown LED illuminated
• Yellow shutdown LED illuminated
• Red shutdown LED illuminated
• If there is a problem with the ozone
lamp the ozone LED will not
illuminate and the service light will
begin to blink
• No airflow present
• Blue shutdown LED illuminated
• Yellow shutdown LED illuminated
• Red shutdown LED illuminated
• If there is a problem with the germicidal
lamp, the germicidal LED light will not
illuminate and the service light will
begin to blink.
• The control board will occasionally turn
off the ozone lamp to reduce the ozone
output. When this happens, the ozone
LED light will blink.
Solution
• Check main power to system
• Check fuse, replace if blown
• Check the unit to ensure it is supplying airflow
• Adjust the airflow sensitivity jumper to be more sensitive
• Check the unit to ensure the airflow is off
• Adjust the airflow sensitivity jumper to be less sensitivity
• Check the HVAC system to ensure it is supplying airflow
• Control board is shutting down the ozone lamp
• Lamp filaments are damaged, replace the ozone lamp
• High ambient temperature
• Replace the ozone lamp
• Check the HVAC system to ensure it is supplying airflow
• Control board is shutting down the germicidal lamp
• Lamp filaments are damaged, replace the germicidal lamp
• High ambient temperature
• Replace the germicidal lamp
• This is normal; there is no problem.
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