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2VV.
Creating innovative solutions for you and your business since 1995.
ver.5 05-05-20
9. REMOVING FAULTS
ATTENTION!
● Before starting the maintenance and repair
works, the unit must be disconnected from the
power source and the supply voltage must be
locked, service switch must be in the position 0
(off).
● Do not start repairs, if you are not sure of or
familiar with the exact procedure. Contact the
specialised service!!!
TECHNICAL DATA
● A fault is usually indicated by a message on the
display, see the table below.
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
engine.
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
engine.
6 – Inlet filter
clogged
Unit is venti-
lating
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.
7 – Exhaust filter
clogged
Unit is venti-
lating
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 venti-
lating
Overheated electric ex-
changer or damaged sensor
Open the exchanger ther-
mostat.
Check that air can flow freely through the unit,
electric heat exchanger is not cooling sufficient
-
ly. Check the safety thermostat on the electric
preheating for damages.
9 - Failure in ex-
changer 1
Unit is venti-
lating
Overheated electric ex-
changer or damaged sensor
Open the exchanger ther-
mostat.
Check that air can flow freely through the unit,
electric heat exchanger is not cooling sufficient
-
ly. Check the safety thermostat on the electric
reheating for damages.
10 - Failure in
exchanger 2
Unit is venti-
lating
Overheated electric ex-
changer or damaged sensor
Open the exchanger ther-
mostat.
Check that air can flow freely through the unit,
electric heat exchanger is not cooling sufficient
-
ly. Check the safety thermostat on the electric
reheating for damages.
11 - Failure in
preheating 1
Unit is venti-
lating
Overheated electric ex-
changer or damaged sensor
Open the exchanger ther-
mostat.
Check that air can flow freely through the unit,
electric heat exchanger is not cooling sufficient
-
ly. Check the safety thermostat on the electric
preheating for damages.