Symptom
:
In
HEAT
Mode,
indoor
unit
is
blowing
cold
air
instead
of
heating.
Reason
:
Missing
wire
connection,
defective
reversing
valve
actuator.
Solution
:
Otherwise,
assure
that
the
YELLOW
wire
is
attached
to
terminal
#3
on
the
outdoor
unit.
Also
check
that
the
same
yellow
wire
is
either
connected
to
the
#3
terminal
on
the
indoor
unit
(009,
012,
018
models)
or
the
white
plug
at
the
end
of
the
cable
at
the
indoor
side
is
plugged
with
the
matching
white
plug
on
the
indoor
unit
properly
(for
024
models
only).
While
in
Heat
Mode:
Check
for
voltage
between
#3
and
N
terminals
on
115V
models
and
assure
it
reads
115V
or
check
between
#3
and
L2
terminals
on
230V
models
and
assure
it
reads
230V
(at
the
outdoor
unit's
terminal
block).
Symptom
:
Both
indoor
and
outdoor
units
run
but
there
is
no
heating
or
cooling.
Reason
:
Valves
were
not
fully
opened,
like
set
is
kinked,
refrigerant
was
lost.
Solution
:
Assure
that
the
system
was
properly
vacuumed
before
releasing
the
refrigerant.
Assure
both
valves
on
the
outdoor
unit
were
fully
opened.
Assure
there
are
no
refrigerant
leak
at
any
of
the
4
flare
connections
attached
during
installation.
Check
for
pressure
reading
in
cool
mode
to
be
approx
120
PSI
and
both
copper
pipes
to
be
very
cold
and
sweating.
Check
for
pressure
reading
in
heat
mode
to
be
approx
400
PSI
and
both
copper
pipes
to
be
very
hot.
Symptom
:
In
heat
mode
outdoor
unit
runs
but
indoor
unit
fan
does
not
start
blowing.
Reason
:
System
is
in
warm
Start
Mode.
If
extended
this
can
mean
refrigerant
loss.
Solution
:
When
the
compressor
first
starts
in
heat
mode,
indoor
fan
is
delayed
until
the
indoor
coil
surface
gets
hot
enough
to
produce
warm
air
discharge.
The
fan
starts
blowing
once
the
indoor
coil
is
warmed.
This
takes
maximum
1
minute.
If
this
is
extended
further,
than
check
for
operating
pressures
and
assure
the
system
has
no
refrigerant
leaks.
Symptom
:
System
does
not
start
cooling
or
heating
as
soon
as
it
is
started.
Reason
:
System
is
in
protection
time
delay
mode.
Solution
:
When
the
system
is
started,
the
compressor
does
not
start
immediately.
There
is
a
3
minute
time
delay
for
protection.
Symptom
:
Indoor
unit
seems
totally
dead.
No
lights.
Reason
:
Power
connection
from
the
outdoor
unit
is
not
made
properly
or
fuse
was
blown.
Solution
:
Check
for
the
voltage
between
L
and
N
terminals
on
the
indoor
units
terminal
block
(for
115V
systems)
to
read
115
VAC.
Check
for
the
voltage
between
L1
and
L2
terminals
on
the
indoor
units
terminal
block
(for
230V
systems)
to
read
230
VAC.
Check
the
other
end
of
the
same
wires
on
the
outdoor
unit
for
the
same
voltage.
Assure
the
breaker
is
not
tripped.
If
the
voltage
is
present
on
the
indoor
unit,
fuse
may
be
blown
on
the
controller
card
of
the
indoor
unit.
Replace
with
a
5A
fuse.
Or
replace
the
control
card.
Symptom
:
Indoor
unit
fan
runs
continuously
in
cooling
mode.
Reason
:
This
is
a
normal
and
required
condition
programmed
by
the
internal
software.
Solution
:
Indoor
fan
must
run
continually
in
cooling
mode
to
be
able
to
sample
the
air
temperature
and
call
for
the
compressor
to
cycle
on
when
needed.
This
is
normal.
Indoor
fan
motor
operates
on
only
a
few
pennies
a
day,
so
it
will
not
waste
any
significant
amount
of
energy,
plus
it
will
provide
a
positive
air
circulation
for
better
comfort.
Symptom
:
Indoor
unit
fan
comes
on
and
off
briefly
in
heat
mode.
Reason
:
This
is
a
normal
and
required
condition
programmed
by
the
internal
software.
Solution
:
Indoor
fan
must
runs
once
in
a
while
to
sample
the
air
temperature
and
call
for
the
compressor
to
cycle
on
when
needed.
This
is
normal.
Unlike
the
cooling
mode,
indoor
fan
does
not
run
continually
in
cooling
mode
to
prevent
cols
air
draft.
The
temperature
swings
in
the
space
between
the
on
and
off
modes
will
be
slightly
higher
than
the
cooling
mode.
