VE0067
OL
OC
VE0082
B
G
9.0 Troubleshooting
Start-up troubleshooting:
NOTE:
Inspect the unit before proceeding with these steps.
25
Problems
Possible causes
You should try this
1. Unit does not work.
• The circuit board may
• Unplug the unit. Disconnect the
be defective.
main control and the optional(s)
control(s) (if need be). Jump B and
G terminals. Plug the unit. If the
motor runs on high speed and the
damper opens, the circuit board is
not defective.
2. The damper actuator
• The 9-pin connector may
• Unplug the unit and check to make sure all the crimp
does not work.
have a loose connection.
connections are secured. Check the damper actuator connections
as well.
• The damper actuator may
• Feed 120 V directly to the damper actuator. If the problem
be defective.
persists, replace the damper actuator.
• The circuit board may
• Replace the circuit board if the problem is not solved
be defective.
by the above.
3. The wall control does
• TBI mode is activated.
• If the outside temperature is below -15°C (5°F) and the unit
not work OR
has an enthalpic recovery core (energy recovery core),
the indicators flashes
then the TBI mode is probably activated. (See section 7.5.)
every 8 seconds.
• The wires may be in
• Ensure that the color coded wires have been connected to
reverse position.
to their appropriate places.
• Erratic operation of the
• Unplug the unit. Wait 30 seconds. Plug it back in.
control every 8 seconds.
• 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.
• The wire in the wall OR
• Remove the wall control and test it right beside the unit using
the wall control may
another shorter wirer. If the wall control works there, change
be defective.
the wire. If it does not, change the wall control.
• The circuit board may
• If the second wall control does not solve the problem, then
be defective.
replace the circuit board.
4. The 20-minute push-button
• The switch
• Unplug the unit. Disconnect the
or the 20/40/60-minute
may be defective.
main control and the optional(s)
push-button timer does
control(s) (if need be). Jump the OL
not workOR its indicator
and OC terminals. Plug the unit. If the
light does not stay on
unit switches to high speed, replace
the switch.
