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Test Control Board
Remove cover screws
Remove the 2 screws holding cover on control box.
Lift off the cover.
The Fuse
Check the fuse. If the fuse has blown, the control board
has failed and the entire control board must be replaced.
Fan Motor Resistances
The blue wire is neutral.
White-Blue, Low speed = 14.5 Ohms
Red-Blue, Medium speed = 12.5 Ohms
Gray-Blue, High speed = 10 Ohms
Black-Blue, Boost = 6.5 Ohms
Halogen Lights
Voltage from the board to the primary of the
transformer varies depending on the light setting.
The dimmer for the halogen lights is a pulse width
modulated 120 VAC signal at 30 kHz.
Check the voltage on the primary transformer (the two
terminals on the bottom of the PCB, just left of center).
Voltages on the secondary side of the transformer
should be 1/10th of these values.
Fuse
6
Light Setting
#1
#2
#3
#4 (Brightest)
VAC
65
90
105
120
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