Troubleshooting - Broan HRV90T Installation Manual

10. T
ROUBLESHOOTING
If the unit does not work properly, reset the unit by unplugging it for one minute and then replug it. If it 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 Signal
LED flashes GREEN
LED flashes AMBER
Problems
1 The error code E1 is
displayed on VT8W or
VT7W wall control screen.
2 There is no outside
temperature displayed on
__
VT8W wall control screen
.
3 The VT8W or VT7W wall
control screen alternates
between normal display
and E3.
4 On VT8W wall control, there
is an important difference
between temperature
displayed and
real temperature.
5 Unit does not work.
6 The wall control does not
work.
Error Type
Thermistor error
Damper error
Possible 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 unit thermistor is defective.
• The unit damper has been blocked or
broken.
• The circuit board may be defective.
• The fuse may be defective.
• Unit integrated control set to low or high
speed (AMBER or GREEN
continuous LED).
• Unit not compatible with control.
• The wires may be in reverse position.
• The wires may be misconnected.
• The wires may be broken.
• Defective wall control.
Action
Replace damper system.
Go to point 6
You should try this
• Ensure that the color 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
some minutes before the outside temperature
appears on screen. The shortest delay is
obtained when the wall control is set on MIN or
MAX in VENT Mode.
• Replace the unit damper system.
• Replace the VT8W or VT7W wall control.
• Replace the unit thermistor.
• Check for the proper operation of the unit damper;
replace if necessary.
• 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 motors run on high speed and the damper
opens, the circuit board is not defective.
• Check if fuse F1 (located on PCB) is blown. In that case,
replace fuse F1 as per wiring diagram specifications.
• Press on the integrated push button until the LED
turns off.
• Check table on page 2 for control compatibility.
• Ensure that the color coded wires have been
connected to their appropriate places.
• Ensure the wires are correctly connected.
• Inspect every wire and replace any that are damaged.
• Replace the wall control.
19
Unit Status
Unit works but will defrost frequently
Unit does not work
NO C NC I OC OL Y R G B
VE0097