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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.
Note—there is a 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 level and empty tank if needed, or (if installed) check
condensate pump and make sure pump is working properly. Confirm that there is no
restriction in the drain line from the pump.
CAUSE: High Pressure Cut-out—Check High Pressure Cut-out Switch.
REMEDY: Press Reset and clear away any air flow obstructions to the condenser
intake or condenser discharge.
CAUSE: 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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