Slimline
www.whisperkool.com | Page 23
TROUBLESHOOTING GUIDE
Ice is forming on the evaporator coil
Possible Cause
Solution
Evaporator coil is dirty
Clean coil with a vacuum. If coil is very dirty, use a spray bottle with
a small amount of liquid dish detergent or coil cleaner. Spray coil, let
sit for five minutes, then flush with fresh water.
There is something blocking the supply and/or return air
Remove blockage
One or both evaporator fans are not turning on
Call a service tech to troubleshoot
The temperature of the room to which the unit is exhausting has
dropped below 50°F
Raise the temperature of the exhaust room
The unit has not gone through an Anti-Frost Cycle yet
Check for ice in the depth of the coil. Melt with a blow drier until coil
is warm to the touch. Soak up water with a towel.
If unit continues to ice
Observe ice formation pattern. If only part way up the coil face, unit
could be low on refrigerant. If so, call Customer Service at 1-800-343-
9463.
Unit does not run/power up
Possible Cause
Solution
Unit is not plugged in
Make sure the unit is plugged into an outlet
Power switch not on
Turn unit on by pressing the power button on the control
Line voltage rating is incorrect for the system
Check line voltage to make sure it is 110V-120V
Room temperature equals the setpoint on the controller
Lower setpoint
Thermostat not calling for cooling
Lower setpoint
Faulty thermostat or wiring
Call Customer Service at 1-800-343-9463
Cellar temperature is too warm
Possible Cause
Solution
The temperature of the room to which the unit is exhausting
exceeds 85°F
Intake temperature must drop below 85°F
The unit is undersized for the room
Order correctly sized unit
There is something blocking the supply and/or return air on
evaporator or condenser side of the unit
Remove airflow obstruction
Unit is mounted too low in the room
Relocate unit so the distance from the ceiling and top of the unit is
no more than 18 inches
One or more of the fans is not turning on
Call Customer Service at 1-800-343-9463
Compressor is not turning on
Call Customer Service at 1-800-343-9463
Compressor keeps cycling on overload
Make sure all fans are working and there is no airflow obstruction
Poor seal around door
Make sure there are no air gaps around the door. If door seal is
damaged, replace it.
Setpoint too high
Lower the setpoint
Evaporator coil is frosted or iced up
Observe ice formation pattern. If only part way up the coil face, the
unit could be low on refrigerant. If so, contact your installing techni-
cian to assist with troubleshooting.
System runs constantly
Possible Cause
Solution
Leaky door seal or poorly insulated cellar
Fix leaky door seal and insulate cellar in accordance with this manual
(page 8)
