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Table 23 — EconoMi$er Service Analysis
LEGEND
IFM — Indoor-Fan Motor
PROBLEM
CAUSE
REMEDY
Damper does
not open.
Indoor (evaporator)
fan is off.
Check to ensure that 24 vac is present at Terminal C1 (common power) on the IFC
(indoor [evaporator] fan contactor) or that 24 vac is present at the IFO (indoor [evaporator]
fan on) terminal. Check whether 24 vac is present at PL (plug) 6-1 (red wire) and/or
PL6-3 (black wire). If 24 vac is not present, check wiring (see unit label diagram).
Check proper thermostat connection to G on the connection board.
No power to EconoMi$er
controller.
Check to ensure that 24 vac is present across terminals 24 VAC and 24 v COM on the
EconoMi$er control. If 24 vac is not present, check wiring (see unit label diagram).
If 24 vac is present, status light should be on constantly.
No power to
G terminal.
If IFM is on, check to ensure 24 vac is present on G terminal of the EconoMi$er
controller. If 24 vac is not present, check wiring (see unit label diagram).
Controller fault.
If STATUS light is flashing one flash, the EconoMi$er controller is experiencing a fault
condition. Cycle power to the controller. If condition continues, replace the EconoMi$er
controller.
Thermostat fault.
If STATUS light is flashing two flashes, the EconoMi$er controller senses the thermostat is
wired incorrectly. Check wiring between the thermostat and the connection board in
the electrical panel. The fault condition is caused by Y2 being energized before Y1.
Actuator fault.
Check the wiring between the EconoMi$er controller and the actuator. Hold CONFIG
button between three and ten seconds to verify the actuator’s operation. (This process
takes three minutes to complete.)
EconoMi$er
operation
limited to minimum
position.
Minimum position
set incorrectly.
Verify that the MIN POS (%) is set greater than zero. Adjust MIN POS (%) to 100% to
verify operation, and then set to correct setting.
EconoMi$er changeover
set point set too high or
too low.
Set at correct value. See Table 2.
Supply air temperature
sensor faulty.
If STATUS light is flashing four flashes, the supply air temperature sensor is faulty.
Check wiring or replace sensor.
OAT sensor faulty.
If STATUS light is flashing five flashes, the OAT (outdoor-air temperature) sensor is faulty.
Check wiring or replace sensor.
Damper position
less than
minimum position
set point.
Supply air low limit
strategy controlling.
The supply air temperature is less than 45 F, causing the minimum position to decrease.
Refer to the Start-Up instructions. Verify correct setting of MIN POS (%). If correct,
EconoMi$er is operating correctly.
Damper does not
return to minimum
position.
CO
2
ventilation
strategy controlling.
If a CO
2
sensor is being used, and the damper position is greater than
minimum position, the ventilation control strategy is controlling. Refer to
the Start-Up instructions. EconoMi$er is operating correctly.
Damper does not
close on power
loss.
Damper travel is
restricted.
Check to ensure the damper is not blocked.
