Specifications

10
TROUBLESHOOTING
Refer to the Controls, Start-Up, Operation, Service
and Troubleshooting Instructions for more information on
the following topics: Service Test, Diagnostic Alarm Codes
and Possible Causes, Economizer Troubleshooting, and
Economizer Adjustment. See Table 6 for general economizer
service analysis.
Table 6 — Economizer Service Analysis
LEGEND
PROBLEM POSSIBLE CAUSE REMEDY
Damper Does Not Move. Indoor Fan is off. 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.
Actuator is unplugged at motor or at
economizer board.
Check wiring connections.
Unit is not configured for economizer. Configure unit for economizer per the
instructions.
Outdoor air temperature is above economizer
high temperature lockout.
Adjust the high temperature lockout setting
if it is incorrect, otherwise, economizer is
operating correctly.
Outdoor air temperature is below economizer
low temperature lockout.
Adjust the low temperature lockout setting
if it is incorrect, otherwise, economizer is
operating correctly.
Communication loss to economizer board. Check wiring connections.
Damper is jammed. Identify the obstruction and safely remove.
Economizer Operation is Limited
to Minimum Position.
Minimum position is set incorrectly. Adjust minimum position setting.
Outdoor-air temperature is aboveeconomizer
high temperature lockout.
Adjust the high temperature lockout setting
if it is incorrect, otherwise, economizer is
operating correctly.
Outdoor-air temperature is below economizer
low temperature lockout.
Adjust the low temperature lockout setting
if it is incorrect, otherwise, economizer is
operating correctly.
Outdoor-air thermistor is faulty. Replace outdoor air thermistor.
Low suction pressure problem with a compressor. Economizer is operating correctly, identify
compressor problem.
Economizer Position is Less
than Minimum Position.
IAQ is controlling minimum damper position. Adjust the IAQ settings if incorrect,
otherwise the economizer is operating correctly.
Unit is in Unoccupied mode. Adjust unit occupied schedule if incorrect,
otherwise, economizer is operating correctly.
Economizer Does Not Return
to Minimum Position.
Unit is operating under free cooling. Economizer is operating correctly.
Outdoor Damper Not Fully Closed at
0% Commanded Position or Not Fully
Open at 100%.
Economizer actuator is out of calibration. Enter Service Test mode and run the Calibrate
Economizer (
Service Test → INDP → E.CAL )
procedure.
Damper Does Not Close on
Power Loss.
Damper is jammed. Identify the obstruction and safely remove.
CCN — Carrier Comfort Network
IAQ — Indoor Air Quality