74 OCH0006F08/13/2024
CEILAIR
®
CW & DX IOM
4.2 TROUBLESHOOTING
Symptom Probable Cause Recommendation
Compressor Short
Cycles
a. Low line voltage causing compressor
to overheat.
Check power source for cause of low line
voltage.
b. Dirty or iced over evaporator coil. Defrost and/or clean coil.
c. Reduced airflow (when applicable). Check filter and belt tension.
d. Lack of refrigerant. Check for leak. Repair and recharge
system.
e. Short cycling of conditioned air. 1. Supply and/or return grilles are
incorrectly oriented. Reorient.
2. Supply and return grilles are too close
together. Move farther apart.
3. Insufficient heat load. Add temporary
heat load to compensate.
f. Thermostat is improperly located. Check for supply registers that may be too
close to thermostat. Relocate if necessary.
Heater Inoperative a. Fuses blown/circuit breaker tripped. Check for short circuit; replace fuses/
reset circuit breaker.
b. Thermostat set too low. Increase temperature setpoint.
c. Overheat switch open due to
insufficient airflow across heater
elements.
Check for dirty filters or obstructions that
may reduce airflow. Correct or replace as
needed.
d. Fuse link blown. Replace fuse link (see item immediately
above).
e. Heater element burned out. Check continuity with an ohmmeter.
Replace heater element.
Humidifier
Inoperative
Note: See humidifier
manual for additional
help.
a. Water supply has been turned off or
not connected.
Connect and/or turn on water supply.
b. Humidifier switch is in “Off” position. Turn switch to “Auto/On” position.
c. Electrical connections are loose. Tighten electrical connections.
d. Humidifier fuses are blown. Check for overcurrent by the humidifier
electrodes. Drain water from tank and
refill. Replace fuses.
e. Relative humidity is above setpoint. Adjust humidistat set point.
f. Yellow status LED is flashing. Consult humidifier manual.
g. Water conductivity is too low. Add a teaspoon of table salt to the water
through the top of the cylinder. Typically
only required on initial start-up.
Table 14. Troubleshooting Table, Continued
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