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www.welbilt.com 800-225-9916 59
Evaporator Troubleshooting Chart:
Problem
Possible Cause
Corrective Action
Fan(s) will not operate.
Main switch open
Close switch
Blown fuse(s)
Replace fuse(s). Check for
short circuits or overload
conditions.
Defective motor
Replace motor.
Defective timer or defrost
thermostat
Replace defective component.
Unit in defrost cycle
Wait for completion of cycle.
Walk-in temperature too high.
Thermostat set too high
Adjust thermostat.
Superheat too high
Adjust thermal expansion valve.
System low on refrigerant
Locate and repair leak, recover,
evacuate and recharge.
Coil iced up
Manually defrost coil. Check
defrost controls.
Ice accumulating on ceiling
around evaporator and/or on fan
guards, venturi, or blades.
Defrost duration is too long
Adjust defrost termination
thermostat (if adjustable).
Fan delay not delaying fans
after defrost period
Replace defective defrost
thermostat.
Defective defrost thermostat or
timer
Replace defective component.
Too many defrost cycles per
day
Reduce number of defrost
cycles per day.
Frost on coil after defrost cycle.
Coil temperature not getting
above freezing point during
defrost
Check heater operation
Not enough defrost cycles per
day
Adjust timer for more defrost
cycles per day
Defrost cycle too short
Adjust timer for longer cycle,
check defrost thermostat
mounting
Defective timer or defrost
thermostat
Replace defective component.
Ice accumulating in drain pan.
Defective heater
Replace heater.
Unit not pitched properly
Check and adjust.
Drain line plugged
Clean drain line.
Defective drain line heater
Replace heater.
Defective timer or thermostat
Replace defective component.
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