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2727
For the Installer
Is there a �mer icon displayed
on the wall control?
Disconnect the 6-pin
green connector
(auxiliary controls) from
the unit.
Is problem solved?
Check the OL and OC
terminals, make sure
that there is no short
circuit at the auxiliary
wall controls and at
the unit.
Plug back the 6-pin
green connector.
YES
YES
Disconnect the 4-pin
green connector (main
control) from the unit,
unplug the unit, wait
1 minute and plug unit
back.
Is the problem solved?
YES
Test the main
wall control close
to the machine
using a shorter
wire. Is the
problem solved?
NO
Replace the
electronic board.
NO
Unit is always running in
high speed
NO
Replace the
wall control
wire.
YES
Replace the
wall control.
NO
If the outdoor temperature is colder than -25°C,
this is normal, no ac�on has to be taken. If this
situa�on happens too o�en, make sure that the
unit is set in extended defrost and well balanced.
Also make sure that the outdoor exhaust hood is
not obstructed.
There is a snowflake icon on the wall control
screen.
The unit’s LED flashes RED, 2 blinks per second.
(Unit is in protec�on mode)
Unplug unit, wait 1 minute and plug it back.
Wait un�l the boo�ng sequence is over.
Is the unit’s LED lit?
Make sure that the wall outlet
where the unit is plugged is
powered (120 VAC).
Is there 120 VAC
between J10-1 and
both sides of the fuse?
Is there 9.5 VAC between
J8-4 and J8-5 on the
transformer (yellow wires)?
Replace the
electronic board.
Unit does not work
(no wall control display- no
error code)
Unplug the product
from the outlet.
Discon�nue using the
unit and contact
technical support.
NO
NO
YES
YES
Replace the
transformer.
NO
Test the main wall control close to
the unit using a shorter wire. Is
the problem solved?
Replace the wall
control wire.
YES
YES
Test a new wall control
using the house wire.
Is the problem solved?
NO
Replace the
wall control.
Replace the
electronic
board.
YES NO
Is J10 well connected to the
electronic board?
YES
Restore
connec�on.
NO
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