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0621 TH-6621
OPERATING ISSUE
CAUSES
RECOMMENDATIONS
The unit continually ices up.
NOTE: Some ice buildup
on the evaporator coil
is normal, but airflow
should not be blocked.
No warm air is blowing out of the back
of the unit.
Air filter is dirty and airflow is obstructed.
Dirty evaporator coil.
Ambient temperature may be too low. Raise
temperature with supplementary source.
Clean filter. Unit should have a minimum of 10"
clearance all around it.
Clean coil.
Unit moves some water, but not as
much as expected.
Air filter is dirty or airflow obstructed.
Evaporator coil dirty.
Restrictive or kinked exhaust ducting
(if used).
Unit should have a minimum of 10" clearance
all around it. Clean air filter and ensure
adequate airflow/space around unit.
Clean coil.
Straighten out ducting.
Fan does not run. Compressor
runs briefly, but cycles on/off.
Loose connection in fan circuit.
Fan obstructed and not turning.
Defective fan.
Defective control board.
Check connections.
Remove obstruction.
Replace fan.
Replace control board.
TROUBLESHOOTING CONTINUED
1-800-295-5510
uline.com
