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19
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 thermostat wires, faulty thermostat or transformer/contactor.
REMEDY: Check connections, re-seat connectors. Thermostat may be
defective...remove and replace. Check transformer and/or contactor(s)...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. You should see a
snowflake * designating that the thermostat is calling for cooling.
Note—there is a time delay for the compressor
CAUSE: Thermostat—Loose thermostat wires
REMEDY: Examine the thermostat sub-base for loose thermostat wires.
CAUSE: Condensate Alarm
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. 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: Supply Voltage. 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: Transformer shows open coil circuit failure.
REMEDY: Replace line voltage/low voltage transformer.
CAUSE: Compressor Contactor failure (3 and 5-ton units)
REMEDY: Replace compressor contactor.
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