Broan VB0268 Manual De Instalación página 19

9. TROUBLESHOOTING
If the integrated control LED of the unit is flashing, this means the unit sensors detected a problem. See the list below to know what the
problem is:
LED flashes GREEN (double blink).
LED flashes AMBER.
A few diagnosis procedures may require the unit to be in operation while proceeding. Open the unit door and
bypass its magnetic switch by putting the door white magnet on it. Be careful with moving and/or live parts.
P
ROBLEMS
1. The error code E1 is
displayed on the VT8W
or VT7W wall control
screen.
2. There is no outside
__
temperature displayed on
VT8W wall control screen
.
3. VT8W or VT7W wall
control screen alternates
between normal display
and E3 or E4 appears on
screen.
4. On VT8W wall control,
there is an important
difference between
temperature displayed
and real temperature.
5. Unit does not work (LED
does not light up on the
integrated control).
6. The damper actuator
does not work or rotates
continuously.
• Thermistor error.
• Damper error.
P
OSSIBLE CAUSES
• The wires may be in reverse position.
• The wires may be broken.
• The wires may have a bad connection.
• Unit is on error and integrated control
LED flashes (GREEN or AMBER).
• The unit thermistor is defective
(integrated control LED
GREEN).
• VT8W or VT7W wall control needs to
be reset.
• The VT8W or VT7W wall control is
defective.
• Exterior air intake port is blocked.
• The unit thermistor is defective
(integrated control LED
GREEN).
• The unit damper has been blocked
or broken (integrated control LED
flashes AMBER and unit is OFF).
• Motor won't turn.
• The transformer may be defective.
• The circuit board may be defective.
• The unit is unplugged.
• The unit door is opened.
• A fuse is blown.
• Wrong control connections.
• The damper actuator or the integrated
damper port mechanism may be
defective (integrated control LED
flashes AMBER and unit is OFF).
• The circuit board or the transformer
may be defective.(integrated control
LED flashes AMBER and unit is OFF)
!
WARNING
Y
OU SHOULD TRY THIS
• Ensure that the color coded wires have been connected to their appropriate
places.
• Inspect every wire and replace any that are damaged.
• Ensure the wires are correctly connected.
NOTE: At its very start-up or after a power failure, it takes a few minutes before
the outside temperature appears on screen. The delay depends on the
operation mode the wall control is in. The shortest delay is obtained
when the wall control is set on MIN or MAX in VENT Mode.
• Check if unit is operating.
• Replace the unit thermistor.
flashes
• Reset the VT8W or VT7W wall
control by pressing simultaneously
on both keys for 8 second (as shown
at right). Then, unplug the unit for
30 seconds. Plug the unit back.
• If the problem is not solved, replace the wall control.
• Clean the exterior air intake port.
• Replace the unit thermistor.
flashes
• Check for the proper operation of the unit damper; replace if necessary.
• Confirm that the motor is running, if not refer to point 9.
• Check for 24 VAC on J8-1 and J8-2.
• Unplug the unit. Disconnect the main control
and the optional(s) control(s) (if need be).
Jump G and B terminals. Plug the unit back
and wait about 10 seconds. If the motor runs
on high speed and the damper opens, the
circuit board is not defective.
• Plug the unit.
• Close unit door.
• Inspect fuse on circuit board (refer to wiring diagram F1 on page 16).
• Try the integrated control (see Section 4.1 on page 13).
• Unplug the unit. Disconnect the main control and the optional controls(s) (if
need be). Wait 10 seconds and plug the unit back. Check if the damper opens.
If not, use a mulltimeter and check for 24 VAC on J12-1 and J12-2 (in electrical
compartment). If there is 24 VAC, replace the entire port assembly.
NOTE: It is normal to experience a small delay (7-8 seconds) before detecting
the 24 VAC signal at starting-up. This signal will stay during 17-18
seconds before disappearing.
• If there is no 24 VAC, check for 24 VAC between J8-1 and J8-2. If there is 24 VAC
replace the circuit board, and if there is no 24 VAC, change the transformer.
19
Replace the thermistor kit.
Go to point 10.
B 8
OTH DURING SEC
VQ0048A
VT8W
NO C NC I OC OL Y R G B
VE0097
.
VQ0062
VT7W