5-5
Troubleshooting CT Hoods and DD Ventilation
Low-Profi le
Symptom Possible Cause Action Required
Fan does not operate with
switch on.
No power to the unit Plug in power cord or reset power supply breaker
Defective Control Board
Check for Voltage at CN1 terminals on Cntl Brd
Defective Fan Motor Check Continuity of Fan Motor - Replace if defective.
Defective Wiring Replace Wire Harness
Fan runs but does not move
enough air.
Improper Installation
Verify that duct was properly sized and no obstructions
are present
Verify tape was removed from damper during installation
Verify a compatible Wolf blower is installed
Verify adequate make-up air present
Filters are soiled Clean or Replace Filters
Defective Control Board Verify correct voltage output at control board
Defective Motor Verify correct amperage draw
Lights do not work. Defective Bulb Check bulb for continuity and place if defective
Replace bulb with known good bulb
Defective Fuse Check fuse for continuity and place if defective
Replace fuse with known good bulb
Defective Control Board
Verify voltage output at board and replace board if
voltage not present
Fan cycles on and off. Motor overheating
Check for obstructions in ducting or fan blade
obstructions
Defective Control Board
Verify if voltage at Control Board is cycling at same rate -
replace if it is cycling.
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