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Table 17 — EconoMi$er Troubleshooting
LEGEND
Table 18 — MoistureMiser Dehumidification Subcooler Service Analysis
PROBLEM POTENTIAL CAUSE REMEDY
Damper Does Not
Open
Indoor (Evaporator) Fan is
Off
Check to ensure that 24 vac is present at Terminal C1 (Common Power)
on the IFC (Indoor [Evaporator] Fan Contactor) or that 24 vac is present at
the IFO (Indoor [Evaporator] Fan On) terminal. Check whether 24 vac is
present at PL6-1 (red wire) and/or PL6-3 (black wire). If 24 vac is
not present, check wiring (see unit label diagram).
Check proper thermostat connection to G on the connection board.
No Power to EconoMi$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$er controller senses that
the thermostat is wired incorrectly. Check wiring between the thermostat
and the connection board in the electrical panel. The fault condition is
caused by Y2 being energized before Y1.
Actuator Fault Check the wiring between the EconoMi$er controller and the actuator.
Hold CONFIG button between 3 and 10 seconds to verify the
actuator’s operation. (This process takes 3 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 5.
Discharge Air
Thermistor Faulty
If STATUS light is flashing 4 flashes, Discharge Air Thermistor is
faulty. Check wiring or replace sensor.
Outdoor Air Temperature
Sensor Faulty
If STATUS light is flashing 5 flashes, 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 be decreased. 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.
IFM —
Indoor Fan Motor
PL —
Plug
PROBLEM CAUSE REMEDY
Subcooler will not energize
No power to subcooler
control transformer.
Check power source. Ensure all wire connections
are tight.
No power from subcooler
control transformer to liquid line three way valve.
1. Fuse open; check fuse. Ensure continuity of wiring.
2. Subcooler control low pressure switch open.
Cycle unit off and allow low-pressure switch
to reset. Replace switch if it will not close.
3. Transformer bad; check transformer.
Liquid line three-way valve
will not operate.
1. Solenoid coil defective; replace.
2. Solenoid valve stuck closed; replace.
Subcooler will not deenergize
Liquid Line three-way valve
will not close.
Valve is stuck open; replace.
Low system capacity
Low refrigerant charge or
frosted coil.
1. Check charge amount. See system charging
section.
2. Evaporator coil frosted; check and replace
subcooler control low pressure switch if necessary.