33
UAB AMALVA we reserve the right to make changes without prior notice.
3.8 T
able
Failures indicated on the control panel, possible reasons and it elimination
Message
LED
Protection tripping description
Possible Failure Cause
Failure Elimination
Red and
green blinking
Depending
on
the
intensity
of
unit
operation,
at
a
cer
-
tain
time
a
periodic
inspection
message
appears
on
the control panel.
After
disconnecting
the
unit
from
power
supply
,
it
is
necessary
to
carry
out
periodic
inspection
of
the
unit,
i.e.
to
check
the
air
filter
clogging
and
the
con
-
dition of the heat exchanger
, the heater and fans.
Red light
If
the
supply
air
temperature
falls
below
the
permitted
value:
+5°C,
unit
will
stop
operating
with
10
min.
delay
.
Malfunction
of
the
heat
exchanger and/or heater
.
Check temperature and season settings. Check
the heat exchanger and heater operation.
Red light
If
the
supply
air
temperature
is
above
the
permitted
val
-
ue: +45°C, unit will stop operating with 10 min. delay
.
Malfunction
of
the
heat
exchanger and/or heater
.
Check
temperature
and
season
settings.
Check
the
heat exchanger and heater operation.
Red and
green blinking
Unit with electric heater has protection from overheat
-
ing at 70°C, which can be activated if the heater blow- cooling is insufficient. Unit operation is not terminated.
Heater
is
disconnected
due
to
low air flow
.
When heater cools down, protection restores auto
-
matically
. It is recommended to increase ventilation
intensity level.
Red light
Unit
with
electric
heater
has
emergency
protection
from
overheating
at
100°C,
which
can
be
activated
in
case of the heater failure. Unit operation is terminated.
Electric
heater
overheating
protection is on.
It is possible to restore emergency overheating pro
-
tection
with
button
“RESET”
(located
on
the
heater),
only
if
before
heater
overheating
cause
has
been
clarified and eliminated.
Red light
In
the
unit
with
water
heater
, when
the
water
tempera
-
ture
falls
below
the
permitted
value
of
+10°C,
the
unit
will stop operating.
Failure
of
the
hot
water
prepa
-
ration
and
supply
function
in
the heating system.
Check
circulation
pump
and
heating
system
condi
-
tion, heating valve actuator perfor-mance.
Red light
In
the
unit
with
plate
heat
exchanger
,
if
the
freezing
protection
of
the
heat
exchanger
is
activated
and
is
not
restored, the unit will stop operating.
Temperature
of
the
air
passing
through
plate
heat
exchanger
,
dropped
lower
allowable
level.
Check
by-pass
damper
condition
and
actuator
per
-
formance.
It
is
recommended
to
decrease
ventila
-
tion level.
Red light
When
there
is
no
signal
from
the
rotor
’s
rotation
sen
-
sor
, if
the
“Winter”
season
is
set,
the
unit
will
stop
op
-
erating in 2 min.
The
belt
is
broken,
failure
of
the
rotor
motor
or
rotor
sensor
.
Check rotor drive and rotation sensor condition.
Red and
green blinking
When
there
is
no
signal
from
the
rotor
’s
rotation
sen
-
sor
, if
the
“Summer”
season
is
set,
the
warning
mes
-
sage
appears
in
2
min.
on
the
control
panel.
The
unit
operation is not terminated.
The
belt
is
broken,
failure
of
the
rotor
motor
or
rotor
sensor
.
Check rotor drive and rotation sensor condition.
Red light
When temperature exceeds the maximum permitted
limits: -30°C...+75°C, the unit stops operating im
-
mediately
.
Supply
air
temperature
sen
-
sor
is
not
connected
or
broken
down.
It
is
necessary
to
check
sensor
connections
or
change the sensor
.
Summary of Contents for Domekt RECU
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