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 (if equipped) 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.
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 on back of unit). Re-start unit.
CAUSE:
Low Voltage — “LAC” is displayed. Check power supply for voltage outside the
range of 106-126 volts on the 115 Volt units and 187-253 Volts on the 208/230 Volt units.
REMEDY:
Have power checked by electrician and repaired.
CAUSE:
Compressor relay failure.
REMEDY:
Replace power module.
CAUSE:
Compressor Contactor failure (3 and 5-ton units)
REMEDY:
Replace compressor contactor.
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