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TROUBLESHOOTING GUIDE
The following steps and procedures are recommended for correcting the problems
indicated. In the event that the problem can not be corrected, service may be required.
SERVICE SHOULD BE PERFORMED BY A QUALIFIED AIR
CONDITIONING SERVICE TECHNICIAN
PROBLEM: UNIT DOES NOT POWER UP
CAUSE: Power interruption
REMEDY: Check LCDI and reset. Check external power supply making sure that the
disconnect is ON. Check for blown fuses or tripped circuit breakers. Reset or replace
(as needed).
PROBLEM: NO DISPLAY ON THERMOSTAT AFTER POWER "ON"
CAUSE: Loose display cable, faulty thermostat or faulty power module
REMEDY: Check display cable, re-seat connectors. Thermostat may be
defective...remove and replace. Power module may be defective...remove and replace.
PROBLEM: EVAPORATOR FAN RUNS BUT COMPRESSOR DOES NOT
START
CAUSE: Thermostat — set point is too high.
REMEDY: Make sure set-point is lower than room temperature. Look for a red dot to
the right of the temperature displayed for cooling.
Note—there is a time delay for the compressor
CAUSE: Thermostat—Loose display cable
REMEDY: Examine the thermostat for a loose cable connection. Re-seat the display
cable from thermostat to power module.
CAUSE: Condensate Alarm—"CON" is displayed.
REMEDY: Check condensate pump and make sure pump is working properly and that
there is no kink in the drain line from the pump.
CAUSE: High Pressure Cut-Out—"CON" is displayed. Inadequate/turned off condenser
water supply.
REMEDY: Verify condenser water supply. Check High Pressure Cut-Out Switch.
Press Reset (RED Button in recessed cubby). Re-start unit.
CAUSE: Low Voltage — "LAC" is displayed. Check power supply for voltage outside
the range of 106-126 volts.
REMEDY: Have power checked by electrician and repaired.
CAUSE: Compressor relay failure...fan relay failure
REMEDY: Replace power module.
17
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