15
9.0
TROUBLESHOOTING
Note: Be sure to unplug and inspect the unit before proceeding with these steps.
Start with point 1,then point 2 and so on.
Start-up troubleshooting:
Problems Possible causes You should try this
1. Unit doesn't work. • Erratic operation of the electronic circuit. • Unplug the unit. Wait for 30 seconds. Plug it back in.
• The breaker in the electrical • Reset breaker. If it trips again, unplug the unit and call
panel may be tripped. an electrician.
• The door switch may be defective. • Using a multimeter, check for power across the switch (the
door switch must be pushed in for this test). If there is no
power, replace the switch.
• The circuit board may be defective. • Jump BLACK and GREEN terminals and check if the motor
runs on high speed (or jump BLACK and RED terminals and
check if the motor runs on low speed) and the damper opens,
the circuit board is not defective. (The door switch must be
pushed in for this test). Replace the board if no voltage is
detected.
• The fan motor may be defective. • Unplug the unit and disconnect the fan motor (4 wires). Supply 120V
directly to the GREY and ORANGE wires of the fan motor.
Replace the motor if not working.
• The 9-pin connector may have • Unplug the unit and check to make sure all the crimp connections
a loose connection. are sound.
Check the fan motor and the damper actuator connections as well.
2. The damper actuator • The 9-pin connector may have • Unplug the unit and check to make sure all the crimp connections
doesn't work. a loose connection. are secured. Check the damper actuator connections as well.
• The damper actuator may be defective. • Feed 120V directly to the damper actuator. If the problem persists,
replace that damper actuator.
• The circuit board may be defective. • Replace the circuit board if the problem is not solved by the above.
3. The wall control will • The wire in the wall OR the • Remove the wall control and test it right beside the unit using
not function. wall control may be defective. another shorter wire. If the wall control works there, change the
wire. If it doesn’t, change the wall control.
• The wires may be in reverse position. • Ensure that the color coded wires have been connected to
their appropriate places.
• The wires may be broken. • Inspect every wire and replace any that are damaged.
• There may be a short-circuit. • With the help of a multimeter, check for continuity.
4. The 20-minute • Switch may be defective. • Jump the OL and OC terminals. If the unit switches to high speed
push-button switch then the wires are not the problem. Replace the push button.
doesn't work OR its • The wires may be defective or • Ensure that the color coded wires have been connected to their
indicator light may not be connected properly. appropriate places.
doesn't stay on.
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