5-4
TroubleshootingCT Hoods and DD Ventilation
Downdraft
Symptom Diagnostic Test Resolution
Periscope does not go up No power to the unit
Plug in power cord or reset power supply
breaker
“Up/Down” LED does not
illuminate on touch control
Check continuity of communication cable
and replace if bad
Replace Touch Control
Gear Motor defective Replace Gear Motor
Defective Crank Assembly Check U-Clamps for tightness
If stripped replace Crank Assembly
Check for 120 VAC from yellow
to white at Control Board while
pressing “Up/Down” on touch
control
If “Up/Down” LED is illuminated but no
voltage change Control Board
Periscope begins to move but will
not continue to top or bottom of
cycle
Defective Front Cam Switch Replace Cam Switch
Defective Crank Assembly Check U-Clamps for tightness
If stripped replace Crank Assembly
Gear Motor defective Replace Gear Motor
Periscope does not go down No power to the unit
Plug in power cord or reset power supply
breaker
Gear Motor defective Replace Gear Motor
Defective Crank Assembly Check U-Clamps for tightness
If stripped replace Crank Assembly
Periscope installed incorrectly Reinstall Periscope
Check for 120 VAC from yellow
to white at Control Board while
pressing “Up/Down” on touch
control
If “Up/Down” LED is illuminated but no
voltage change Control Board
Blower does not run No power to the unit
Plug in power cord or reset power supply
breaker
Remote blower improperly wired Check Wiring Section
LED on touch control for selected
speed is not illuminated
Check continuity of communication cable
and replace if bad
Replace Touch Control
Defective blower motor Replace motor
Verify Rear Cam Switch is
dropping into Cam valley at top of
periscope movement
Replace Gear Motor assembly w/switches
Rear Cam Switch not providing
120 VAC to orange wire w/
periscope at top of movement and
switch in valley
Replace Rear Cam switch
120 VAC not present from Orange
to White at Control Board w/
periscope up
Replace Control Board
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