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PROBLEM
Damper does not move
Economizer operation is limited
to minimum position
Economizer position is less
than minimum position
Economizer does not return
to minimum position
Damper does not close on
power loss
LEGEND
CCN — Carrier Comfort Network
IAQ
— Indoor Air Quality
Economizer Troubleshooting
POSSIBLE CAUSE
Indoor Fan is off
Actuator is unplugged at motor or at
economizer board
Unit is not configured for economizer
Outdoor air temperature is above economizer
high temperature lockout
Outdoor air temperature is below economizer
low temperature lockout
Communication loss to economizer board
Damper is jammed
Minimum position is set incorrectly
Outdoor-air temperature is above economizer
high temperature lockout
Outdoor-air temperature is below economizer
low temperature lockout
Outdoor-air thermistor is faulty
Low suction pressure problem with a compressor
IAQ is controlling minimum damper position
Unit is in Unoccupied mode
Unit is operating under free cooling
Damper is jammed
7
REMEDY
Check proper thermostat connection
Unit is not configured for continuous fan
operation and the thermostat is not calling for
heating or cooling
Unit is in Unoccupied mode and there is no
call for heating or cooling
Blown fuse (FU1, FU2)
Tripped circuit breaker (CB1, CB2, CB3)
No power to the unit
Unit is off via CCN command
Fan feedback is open and should be closed,
check for Fan Feedback alarm T409
Check wiring connections
Configure unit for economizer per the
instructions
Adjust the high temperature lockout setting
if it is incorrect, otherwise, economizer is
operating correctly
Adjust the low temperature lockout setting
if it is incorrect, otherwise, economizer is
operating correctly
Check wiring connections
Identify the obstruction and safely remove
Adjust minimum position setting
Adjust the high temperature lockout setting
if it is incorrect, otherwise, economizer is
operating correctly
Adjust the low temperature lockout setting
if it is incorrect, otherwise, economizer is
operating correctly
Replace outdoor air thermistor
Economizer is operating correctly, identify
compressor problem
Adjust the IAQ settings if incorrect,
otherwise the economizer is operating correctly
Adjust unit occupied schedule if incorrect,
otherwise, economizer is operating correctly
Economizer is operating correctly
Identify the obstruction and safely remove
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