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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 (on models with LCDI), and reset LCDI. Check external power
supply making sure that the disconnect is ON. Check for blown fuses or tripped
circuit breakers. Reset or replace if needed.
CAUSE: Loose display cable
REMEDY: Re-seat display cable at display and power module.
CAUSE: Phase Monitor Fault (3-Phase Models)
REMEDY: Check Phase Monitor, and correct power problem
PROBLEM: EVAPORATOR FAN RUNS BUT
COMPRESSOR AND CONDENSER FAN DO NOT START
CAUSE: SET POINT — setting may be too high for cooling or too low for heating.
REMEDY: Make sure set-point is adjusted accordingly. You should see a red dot to
the right of the temperature display indicating compressor ON.
Note—there is a time delay for the compressor
CAUSE: Loose Display Cable
REMEDY: Examine the control unit for loose wires. Tighten any loose connections.
CAUSE: Condition Alarm—"CON".
REMEDY: Check condensate tank and empty tank or 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" Check High Pressure Cut-out Switch.
REMEDY: Press Reset and clear away any obstructions to the condenser intake or
condenser discharge.
CAUSE: Compressor contactor open or burned
REMEDY: Replace contactor
CAUSE: Defective Power Module
REMEDY: Replace Power Module
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