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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.
PROBLEM: NO DISPLAY ON THERMOSTAT
CAUSE: Faulty thermostat or faulty transformer
REMEDY: Thermostat may be defective...remove and replace. Transformer
may be defective...remove and replace.
PROBLEM: EVAPORATOR FAN RUNS BUT COMPRESSOR AND
CONDENSER FAN DO NOT START
CAUSE: Thermostat — setting may be too high.
REMEDY: Make sure set-point is lower than room temperature. You should
see a snowflake ”Ä” designating that the thermostat is calling for cooling.
Note—there is a 4 minute time delay for the compressor
CAUSE: Thermostat—Loose wiring
REMEDY: Examine the control unit for loose wires. Tighten any loose
connections.
CAUSE: Condensate Alarm—Check for Condensate Alarm Light.
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—Check High Pressure Cut-out Switch.
Press Reset and clear away any obstructions to the condenser intake or
condenser discharge.
CAUSE: Low Voltage — Check power supply for voltage outside the range
of 106-126 volts on the 115 Volt unit and 187-253 Volts on the 208/230 Volt
unit.
REMEDY: Have power checked by electrician and repaired.
CAUSE: Compressor contactor open or burned.
REMEDY: Replace contactor
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