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9. TROUBLESHOOTING (
P
ROBLEMS
The error code E1 is
1
displayed on VT8W or
VT7W wall control screen.
There is no outdoor
temperature displayed on
2
__
VT8W wall control screen
.
VT8W or VT7W wall
control screen alternates
3
between normal display
and E3.
The main wall control
4
does not work.
Unit does not work (LED
5
not lit on power up).
The auxiliary control does
6
not work.
'
)
CONT
D
P
OSSIBLE CAUSES
• Unit not compatible with control.
• The wires may be in reverse position.
• The wires may be misconnected.
• The wires may be broken.
• The unit is in error.
• RED wire in control cable damaged
or misconnected.
• The VT8W or VT7W wall control
may be defective.
ERV100S unit only:
• Unit integrated control set to low
or high speed (AMBER or GREEN
continuous LED).
All units:
• 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.
• Unit is unplugged.
• No power to power outlet.
• The fuse may be defective.
• J10, J9, or J8 connector(s) may be
unplugged.
• The transformer may be defective
(no 9.5 VAC between J8-4 and J8-5).
• The PCB may be defective.
• The wires may be in reverse postion.
• The wires may be misconnected.
• The wires may be broken.
• The auxiliary control may be
defective.
Y
OU SHOULD TRY THIS
• 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 is damaged. If wires
are hidden into walls, test the control using a shorter wire.
NOTE: At its very start-up or after a power failure, it takes some
minutes before the outdoor temperature appears on
screen. The shortest delay is obtained when the wall
control is set on MIN or MAX in VENT Mode.
• Check the unit LED to see if it is flashing; if so, refer to the
previous table.
• Ensure the RED wire is not damaged and properly connected.
• Replace the VT8W or VT7W wall control.
• 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.
• Make sure the unit is plugged.
• Test the power outlet with another electrical device (e.g.: a
lamp). If it does not work, call an electrician.
• Check if fuse F1 (located on the PCB) is blown. In that case,
replace fuse F1 as per product nameplate.
• Check the connection of J10, J9, and J8 connector(s).
• With unit powered and J9 connected, check if there is about
9.5 VAC between transformer connector J8-4 and J8-5
(YELLOW wires). If no, change the transformer.
• Unplug the unit. Disconnect
the main control and the
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.
• 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 is damaged. If wires
are hidden into walls, test the control using a shorter wire.
• Jump
the
OL
terminals. If the unit switch
to high speed, remove the
auxiliary control and test it
right beside the unit using another shorter wire. If it works
here, change the wire. If it doesn't, change the auxiliary
control.
23
NO C NC I OC OL Y R G B
VE0097
and
OC
NO C NC I OC OL Y R G B
VE0098
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