Specifications
Control 38
Regular Checks
Check of Operating Mode
In
the
event
of
an
alarm,
The background light of LCD
will
flash
and
an
alarm
message
will
be
displayed.
Check
the
alarm
indicator
r
egularly
to
make
sur
e
that
the
heat
pump
works
pr
o
perly
.
Y
ou
would
not
always
notice
if
ther
e
is
something
wrong,
as
the
auxiliary
heater
would
star
t
automatically
(pr
ovided,
of
course,
operating
mode
AUTO
was
selected).
For
mor
e
information,
please
r
efer
to
the
chapter
ALARM MESSAGES
on
p.
40.
Checking the Water Level of the Heating System
The
pr
essur
e
of
the
heating
system
should
be
checked
once
monthly
.
The
pr
essu
r
e,
shown
on
the
external
pr
essur
e
gauge,
should
be
1-1,5
bar
.
If
the
value
is
below
0.8
bar
with
cold
water
in
the
heating
system,
mor
e
water
must
be
added
(applies
to
a
closed
expansion
vessel).
T
o
find
out
wher
e
the
pr
essur
e
gauge
is
located.
Y
ou
can
use
or
dinary
tap
water
for
filling
the
heating
system.
In
some
rar
e
cases the
water
quality
would
be
unsuitable
for
this
purpose
(corr
osive
or
calcar
eous
water).
In
case
of
doubt,
we
would
r
ecommend
that
you
call
your
installation
contractor
.
Don’t
use
any
water
tr
eatment
additives
for
the
heating
system!