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9. TROUBLESHOOTING
ATTENTION!
● Before and during maintenance and repairs,
the unit must be disconnected from the power
supply, which must be locked, and the service
switch in 0 position (off).
● Do not perform repairs if you aren’t sure or don’t
know the exact procedure; contact a specialised
service!
● Malfunctions are usually signalled with a mes
-
sage on the display. See table below.
TECHNICAL DATA
Description
Unit's be
-
haviour
Likely problem
Solution
4 – Supply fan error Unit is not
working
Overheated fan or defect on
thermal contact of inlet fan
Determine the cause of the overheating (de
-
fective bearing, short-circuit...) or replace
the
fan
.
5 – Exhaust fan
error
Unit is not
working
Overheated fan or defect on
thermal contact of inlet fan
Determine the cause of the overheating (de
-
fective bearing, short-circuit...) or replace
the
fan.
6 - Inlet filter
clogged
Unit is ven
-
tilating
Clogged filter
If the unit does not have a pressure sensor for
the filter, RESET the clogged filter according to
the manual.
7 – Exhaust filter
clogged
Unit is ven
-
tilating
Clogged filter
Check the condition of the filter, or replace it. If
the unit does not have a pressure sensor for the
filter, RESET the clogged filter according to the
manual.
8 - Failure in pre-
heating 1
Unit is ven
-
tilating
Preheated electric exchang
-
er or damaged sensor Open
exchanger’s thermostat
Check that air can flow freely through the unit,
the electric heat exchanger might not be
cooling sufficiently. Check the safety
thermostat on the electric heater for damage.
9 - Failure in ex
-
changer 1
Unit is ven
-
tilating
Post heater 1
electric
exchanger or damaged
sensor
or o
pen exchanger’s
thermostat
.
Check that air can flow freely through the unit,
the electric heat exchanger might not be
cooling sufficiently. Check the safety
thermostat on the electric heater for damage.
10 - Failure in ex
-
changer 2
Unit is ven
-
tilating
Post heater 2 electric
exchanger or damaged
sensor or open exchanger’s
thermostat.
Check that air can flow freely through the unit,
the
electric heat exchanger
might
not
be
cooling sufficiently. Check the safety
thermostat on the electric
heater
for damage.
11 - Failure in pre
-
heating 2
Unit is ven
-
tilating
Preheated electric exchang
-
er or damaged sensor Open
exchanger’s thermostat
Check that air can flow freely through the unit,
the electric heat exchanger might not be
cooling sufficiently. Check the safety
thermostat on the electric heater for damage.
