Installation Guide

25
8. TROUBLESHOOTING
If the unit does not work properly, reset the unit by unplugging and then replug it. If it is still not working properly, refer to the
table below.
If the LED of the unit is flashing, this means the unit sensors have detected a problem. See the table below to know where the problem
occurs on the unit.
LED SIGNAL
ON UNIT
ERROR CODE ON
CONTROL SCREEN
ERROR TYPE ACTION UNIT STATUS
LED flashes
GREEN
(double blink
every
2 seconds).
E21 Cold side thermistor
error.
• Ensure J12 connector is properly connected
and its wires are not damaged. If they are
correct:
• Replace the damper system assembly.
Unit works but will
defrost frequently.
LED flashes
GREEN
(2 blinks per
second; faster
blink).
E22 Warm side
thermistor error.
• Ensure J20 connector is properly connected
and its wires are not damaged. If they are
correct:
• Replace the warm side thermistor.
Unit does not work.
LED flashes
AMBER.
E23 Damper system
error.
• Go to point 6 in next table. Unit does not work.
LED flashes
RED
(one blink
every
2 seconds).
E25 and E26
alternately
Open door while the
unit is in function or
magnetic switch bad
contact.
• Reset the VT9W wall control by pressing on
MODE and %HUM keys for 10 seconds.
• Check if the unit door is properly closed and for
the door magnet to be properly seated onto the
door. If not, correct the situation, close the door
and reset the VT9W wall control by pressing
on MODE and %HUM keys for 10 seconds.
• Ensure J11 connector is properly connected
and its wires are not damaged. If not, correct the
situation, close the door and reset the VT9W
wall control by pressing on MODE and %HUM
keys for 10 seconds.
• Using a flat blade screwdriver, jump J11, reset
the VT9W wall control by pressing on MODE
and %HUM keys for 10 seconds and set the
unit on CONT.
If the LED is still flashing, go to point 8 in next
table for motor diagnosis.
Unit does not work.
E25 Supply motor error. • Go to point 8 in next table.
E26 Exhaust motor error. • Go to point 8 in next table.
LED flashes
RED
(2 blinks per
second; faster
blink).
Unit is on protection
mode.
• If outside temperature is colder than -25°C, it
could be normal for the unit to enter in
protection mode. There is no action to be taken.
• If the snowflake icon appears frequently, the
airflows of the unit may be not balanced or the
damper system may be damaged. See point 7
in next table.
Unit perform a special
defrost and go back to
its previous mode when
completed.
WARNING
Risk of electric shocks. Electronic board connections must be checked by qualified personnel only.
!