Troubleshooting - Broan HRVH100S Installation Manual

9. T
ROUBLESHOOTING
If the unit does not work properly, reset the unit by unplugging it for one minute and then replug it. If it is still not working
properly, refer to table below.
If the integrated control LED of the unit is flashing, this means the unit sensors detected a problem. See the table below to know where
the problem occurs on the unit.
LED
COLOR
LED flashes GREEN
LED flashes AMBER
P
ROBLEMS
The error code E1 is
displayed on VT8W or
1 VT7W wall control screen.
There is no outdoor
temperature displayed on
__
VT8W wall control screen
.
2
VT8W or VT7W wall
control screen alternates
3
between normal display
and E3.
Unit does not work.
4
The damper actuator
does not work.
5
The wall control does not
work.
6
E
RROR TYPE
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.
• The unit thermistor is defective
(the integrated control LED of
the unit must flash GREEN).
• The VT8W or VT7W wall control
may be defective.
• The circuit board
may be defective.
• The fuse may be defective.
• The damper actuator or the
integrated damper mechanism
may be defective.
• The circuit board
transformer may be defective.
• The wires may be in reverse
position.
• The wires may be broken.
• The wire in the wall OR the wall
control may be defective.
A
CTION
Replace thermistor
Go to point 5
Y
OU SOULD TRY THIS
• Ensure that the color coded wires have been connected to their
appropriate places.
• Inspect every wire and replace any that is damaged.
• Ensure the wires are correctly connected.
NOTE: At its very start-up or after a power failure, it takes some
minutes before the outdoor temperature appears on
screen. The delay duration depends on which operation
mode the wall control is set. The shortest delay is obtained
when the wall control is set on MIN or MAX in VENT Mode.
• Replace the unit thermistor.
• Replace the VT8W or VT7W wall control.
• Unplug the unit. Disconnect the
main control and the optional
auxiliary control(s) (if need be).
Jump G and B terminals. Plug the
unit back and wait about 10 seconds. If the motors run on high
speed and the damper opens, the circuit board is not defective.
• Check if fuse F1 is blown. In that case, replace fuse F1 as per
product nameplate.
• 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 multimeter and check
for 24 VAC on J12-1 and J12-2 (in electrical compartment). If
there is 24 VAC, replace the entire damper 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.
or the
• 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.
• Ensure that the color coded wires have been connected to their
appropriate places.
• Inspect every wire and replace any that are damaged.
• Remove the wall control and test it right beside the unit using
another shorter wire. If the wall control works there, change the
wire. If it does not, change the wall control.
19
U
NIT STATUS
Unit works but will defrost frequently
Unit does not work
NO C NC I OC OL Y R G B
VE0097