30
Problems
Possible causes
You should try this
1. Unit does not work.
• The circuit board may
be defective.
• Unplug the unit. Disconnect the 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
does not work.
have a loose connection.
crimp connections are secured. Check the damper
actuator connections as well.
• The damper actuator may
• Feed 120 V directly to the damper actuator. If the
be defective.
problem persists, replace the damper actuator.
• The circuit board may
• Replace the circuit board if the problem is not
be defective.
solved by the above.
3. The wall control does • TBI mode is activated.
• If the outside temperature is below -15°C (5°F)
not work OR
and the unit has an enthalpic recovery core
the indicators flashes
(energy recovery core), then the TBI mode is
every 8 seconds.
probably activated. (See Section 7.5.)
• The wires may be in
• Ensure that the color coded wires have been
reverse position.
connected 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 wall control may
the unit using another shorter wirer. If the wall
be defective.
control works there, change the wire. If it does
not, change the wall control.
• The circuit board may
• If the second wall control does not solve the
be defective.
problem, then replace the circuit board.
Start-up troubleshooting:
NOTE:
Inspect the unit before proceeding with these steps.
13.0 Troubleshooting
VE0082
B
G
