18
7. T
ROUBLESHOOTING
(
CONT
’
D
)
P
ROBLEMS
P
OSSIBLE
CAUSES
Y
OU
SOULD
TRY
THIS
6
The motor does not work.
• The fuse may be defective.
• The circuit board or transformer may
be defective.
• The motor may be defective.
• The motor or capacitor may be
defective.
• Check if fuse F1 is blown. In that case, replace fuse F1 as
per product nameplate.
NOTE: Refer to Section 5
Wiring diagram
.
• Press on TURBO key on main wall control until the unit turns
on high speed (the tornado icon will appear on LCD screen).
Using a multimeter, check the voltage on J4-1 and J4-2. If
both readings are 120 VAC, the circuit board is not defective.
If the reading is not 120 VAC, change the transformer. If no
voltage is present, change the circuit board.
• If the voltage reading is 120 VAC on J4 or J5, change the
defective motor.
• Using a multimeter, check the ohms value on motor
connector. For BLUE and BLACK motor wires, the right
value is ± 43 ohms. For BLUE and BROWN motor wires,
the right value is ± 48 ohms. For BROWN and BLACK motor
wires, the right value is ± 91 ohms. If the ohms values are
the same, the motor is not defective. Replace the motor
capacitor.
7
The defrost cycle does
not work (the fresh air
duct is frozen) OR the
fresh air distributed is very
cold.
• Ice deposits may be hindering the
damper operation.
• The damper rod or the port damper
itself may be broken.
• The damper actuator or circuit board
may be defective.
• Remove the ice.
• Inspect these parts and replace if necessary.
• See point 3.
8
The integrated defrost
control push button does
not work.
• The 30-second boot sequence is not
completed.
• See Section 4.1
Booting Sequence
.
If the problem is still not solved, call the nearest approved Service Center. Also, you can reach our Technical Support.
Broan-NuTone LLC
• Technical Support
Telephone: 1-800-637-1453
Fax: 1-262-673-8709
