Sharp AH-X108 Service Manual ▷ View online
AH/AU-X108E
AY/AE-X108E
AH/AU-X138E
AY/AE-X138E
29
(2) Defrosting conditions
The temperature of the outdoor heat exchanger and
the temperature of the outdoor are detected by 2
sensors, and if it stays in the preset defrost zone for
approximately 120 seconds, defrosting start is
enabled.
If defrosting is enabled when the defrost mask time
ends, defrosting is performed. If defrosting is not
enabled, the machine waits until defrosting is enabled.
Defrost mask times is 20 minutes.
The defrosting zone is decided by outdoor
temperature and outdoor heat exchanger
temperature.
the temperature of the outdoor are detected by 2
sensors, and if it stays in the preset defrost zone for
approximately 120 seconds, defrosting start is
enabled.
If defrosting is enabled when the defrost mask time
ends, defrosting is performed. If defrosting is not
enabled, the machine waits until defrosting is enabled.
Defrost mask times is 20 minutes.
The defrosting zone is decided by outdoor
temperature and outdoor heat exchanger
temperature.
(3) During defrosting
When defrosting begins, the compressor stops.
Approximately 1 minutes later, the compressor
reactivates in the refrigeration cycle, and the outdoor
heat exchanger is defrosted.
Each mode is as follows:
The outdoor fan is stopped
The operating frequency is 90Hz/76Hz [AY-X138E/
AY-X108E]
The indoor fan is stopped
Approximately 1 minutes later, the compressor
reactivates in the refrigeration cycle, and the outdoor
heat exchanger is defrosted.
Each mode is as follows:
The outdoor fan is stopped
The operating frequency is 90Hz/76Hz [AY-X138E/
AY-X108E]
The indoor fan is stopped
(4) Defrost stop
When defrosting time exceeds 12 minutes
When the temperature of the outdoor heat exchanger
rises above approximately 10˚C
Defrost stop is determined by either of the above
conditions, and the compressor is stopped.
At the same time, the outdoor fan go ON. The
compressor is reactivated in the heating cycle 1
minutes after it was stopped, and normal control
resumes.
When the temperature of the outdoor heat exchanger
rises above approximately 10˚C
Defrost stop is determined by either of the above
conditions, and the compressor is stopped.
At the same time, the outdoor fan go ON. The
compressor is reactivated in the heating cycle 1
minutes after it was stopped, and normal control
resumes.
2-2 Frequency control
(1) AC current peak control
This control lowers the compressor frequency if the
AC current exceeds the set values. If the current is
below the set values, the compressor frequency will
not be raised above that frequency, as the maximum
frequency, for 1 minute.
AC current exceeds the set values. If the current is
below the set values, the compressor frequency will
not be raised above that frequency, as the maximum
frequency, for 1 minute.
Model
Set value
AE-X108E
During heating Approximately 8.00 A
AE-X138E
During heating Approximately 10.14 A
AE-X108E, AU-X108E
During cooling Approximately 6.15A
AE-X138E, AU-X138E
During cooling Approximately 7.50 A
(2) Control for prevention of indoor heat exchanger
overheating
If the temperature of the indoor heat exchanger
exceeds the overheating prevention line during
heating due to the operating frequency or the nature
of the operation, the frequency is lowered by
approximately 5 to 10 Hz. After that, the frequency is
lowered by approximately 5 to 10 Hz once every 60
seconds. When the temperature of the indoor heat
exchanger goes below the overheating prevention
line, the frequency is raised by approximately 5 Hz
once every 60 seconds, and normal operation is
restored.
If the frequency is lowered to minimum frequency
without the temperature of the indoor heat exchanger
decreasing and this condition lasts for 1 minute, the
compressor will be stopped.
If the temperature of the indoor heat exchanger
exceeds the overheating prevention line during
heating due to the operating frequency or the nature
of the operation, the frequency is lowered by
approximately 5 to 10 Hz. After that, the frequency is
lowered by approximately 5 to 10 Hz once every 60
seconds. When the temperature of the indoor heat
exchanger goes below the overheating prevention
line, the frequency is raised by approximately 5 Hz
once every 60 seconds, and normal operation is
restored.
If the frequency is lowered to minimum frequency
without the temperature of the indoor heat exchanger
decreasing and this condition lasts for 1 minute, the
compressor will be stopped.
Overheating prevention line
Operating frequency
Above
50 to
43 to
Below
50 Hz
43 Hz
37 Hz
37 Hz
During normal operation
54
53
52
51
During full power operation
58
57
56
54
(3) Control for prevention of outdoor heat exchanger
overheating
If the temperature of the outdoor heat exchanger
exceeds approximately 60
If the temperature of the outdoor heat exchanger
exceeds approximately 60
°
C during cooling, the
operating frequency is lowered by approximately 5 to
20 Hz. After that, the frequency is lowered by
approximately 5 to 10 Hz once every 120 seconds.
When the temperature of the outdoor heat exchanger
goes below approximately 57˚C, the frequency is
raised by approximately 5 Hz once every 60 seconds,
and normal operation is restored.
If the frequency is lowered to minimum frequency
without the temperature of the outdoor heat exchanger
decreasing and this condition lasts for 1 minute, the
compressor will be stopped.
20 Hz. After that, the frequency is lowered by
approximately 5 to 10 Hz once every 120 seconds.
When the temperature of the outdoor heat exchanger
goes below approximately 57˚C, the frequency is
raised by approximately 5 Hz once every 60 seconds,
and normal operation is restored.
If the frequency is lowered to minimum frequency
without the temperature of the outdoor heat exchanger
decreasing and this condition lasts for 1 minute, the
compressor will be stopped.
(4) Control for prevention of discharge overheating
If the discharge temperature exceeds approximately
105
105
°
C during compressor operation, the operating
frequency is lowered by approximately 5 Hz. After
that, the frequency is lowered by approximately 5 Hz
once every 60 seconds. When the temperature of the
outdoor heat exchanger goes below approximately
104˚C, the frequency is raised by approximately 5 Hz
once every 60 seconds, and normal operation is
restored.
If the frequency is lowered to minimum frequency
without the discharge temperature decreasing and this
condition lasts for 1 minute, the compressor will be
stopped.
that, the frequency is lowered by approximately 5 Hz
once every 60 seconds. When the temperature of the
outdoor heat exchanger goes below approximately
104˚C, the frequency is raised by approximately 5 Hz
once every 60 seconds, and normal operation is
restored.
If the frequency is lowered to minimum frequency
without the discharge temperature decreasing and this
condition lasts for 1 minute, the compressor will be
stopped.
(5) Control for prevention of indoor heat exchanger
freezing
If the temperature of the indoor heat exchanger goes
below approximately 5
If the temperature of the indoor heat exchanger goes
below approximately 5
°
C during cooling, the operating
frequency is lowered by approximately 5 Hz. After
that, the frequency is lowered by approximately 5 Hz
once every 60 seconds. When the temperature of the
indoor heat exchanger rises above approximately 5
that, the frequency is lowered by approximately 5 Hz
once every 60 seconds. When the temperature of the
indoor heat exchanger rises above approximately 5
°
C,
the frequency is raised by approximately 5 Hz once
every 60 seconds, and normal operation is restored.
If the temperature of the indoor heat exchanger goes
down to approximately 0
every 60 seconds, and normal operation is restored.
If the temperature of the indoor heat exchanger goes
down to approximately 0
°
C and this condition
continues for 4 minutes, the compressor is stopped.
When the temperature rises above approximately 2˚C,
normal operation is restored.
When the temperature rises above approximately 2˚C,
normal operation is restored.
2-3 Overcurrent protection
(1) Compressor lock detection
(1) Compressor lock detection
If the set value (4.37 A: AE-X138E, AU-X138E / 3.83
A: AE-X108E, AU-X108E) of AC current is exceeded
at 10 to 30 Hz when operation begins, operation is
stopped. In this case, the compressor and outdoor fan
does not stop, and 170 seconds after operation is
stopped, another try will be made. Three retries are
allowed. On the fourth retry, a complete stop request
signal is sent to the indoor unit, and the outdoor unit
will remain stopped until reset is performed. At this
time, the 3-minute delay for control of the outdoor unit
will not function; therefore, do not cancel by removing
the plug and cutting the power.
A: AE-X108E, AU-X108E) of AC current is exceeded
at 10 to 30 Hz when operation begins, operation is
stopped. In this case, the compressor and outdoor fan
does not stop, and 170 seconds after operation is
stopped, another try will be made. Three retries are
allowed. On the fourth retry, a complete stop request
signal is sent to the indoor unit, and the outdoor unit
will remain stopped until reset is performed. At this
time, the 3-minute delay for control of the outdoor unit
will not function; therefore, do not cancel by removing
the plug and cutting the power.
AH/AU-X108E
AY/AE-X108E
AH/AU-X138E
AY/AE-X138E
30
(2) DC overcurrent detection, AC overcurrent detection
To protect against overcurrent due to sudden
changes in load, the compressor is stopped if the set
value (29 A: AE-X138E, AU-X138E / 24 A: AE-
X108E, AU-X108E) DC is exceeded in the DC
section, or the set value (15 A: AE-X138E, AU-
X138E / 11 A: AE-X108E, AU-X108E)AC is
exceeded in the AC section. In this case, the outdoor
fan does not stop, and 170 seconds after operation is
stopped, another try will be made. Three retries are
allowed. On the fourth retry, a complete stop request
signal is sent to the indoor unit, and the outdoor unit
will remain stopped until reset is performed. At this
time, the 3-minute delay for control of the outdoor unit
will not function; therefore, do not cancel by removing
the plug and cutting the power.
changes in load, the compressor is stopped if the set
value (29 A: AE-X138E, AU-X138E / 24 A: AE-
X108E, AU-X108E) DC is exceeded in the DC
section, or the set value (15 A: AE-X138E, AU-
X138E / 11 A: AE-X108E, AU-X108E)AC is
exceeded in the AC section. In this case, the outdoor
fan does not stop, and 170 seconds after operation is
stopped, another try will be made. Three retries are
allowed. On the fourth retry, a complete stop request
signal is sent to the indoor unit, and the outdoor unit
will remain stopped until reset is performed. At this
time, the 3-minute delay for control of the outdoor unit
will not function; therefore, do not cancel by removing
the plug and cutting the power.
2-4 Compressor protector control
If the temperature of the compressor chamber
exceeds 114
exceeds 114
°
C, the compressor is stopped. In this
case, the outdoor fan does not stop, and when the
compressor chamber temperature decreases to
100
compressor chamber temperature decreases to
100
°
C three minutes after operation is stopped,
another try will be made. Three retries are allowed.
On the fourth retry, a complete stop request signal is
sent to the indoor unit, and the outdoor unit will
On the fourth retry, a complete stop request signal is
sent to the indoor unit, and the outdoor unit will
remain stopped until reset is performed. At this time,
the 3-minute delay for control of the outdoor unit will
not function; therefore, do not cancel by removing the
plug and cutting the power.
the 3-minute delay for control of the outdoor unit will
not function; therefore, do not cancel by removing the
plug and cutting the power.
2-5 Power transistor module protector
If the temperature of the chips in the power transistor
module exceeds 110
module exceeds 110
°
C, the compressor is stopped.
In this case, the outdoor fan does not stop, and when
the temperature of the chips in the power transistor
module decreases to 110
the temperature of the chips in the power transistor
module decreases to 110
°
C 170 seconds after
operation is stopped, another try will be made. Three
retries are allowed. On the fourth retry, a complete
stop request signal is sent to the indoor unit, and the
outdoor unit will remain stopped until reset is
performed. At this time, the 3-minute delay for control
of the outdoor unit will not function; therefore, do not
cancel by removing the plug and cutting the power.
retries are allowed. On the fourth retry, a complete
stop request signal is sent to the indoor unit, and the
outdoor unit will remain stopped until reset is
performed. At this time, the 3-minute delay for control
of the outdoor unit will not function; therefore, do not
cancel by removing the plug and cutting the power.
2-6 Serial signals
(1) Serial signals consist of all 96-bit signals.
(2) If the outdoor unit does not receive a serial signal, it
(1) Serial signals consist of all 96-bit signals.
(2) If the outdoor unit does not receive a serial signal, it
will stop approximately 30 seconds later. Note that this
is true only of normal operation; in test mode, it does
not stop and operation takes place based on the test
mode commands.
is true only of normal operation; in test mode, it does
not stop and operation takes place based on the test
mode commands.
Function
NO
Description
Detection
time
time
Restart
condition
condition
Restart
times
times
Indoor Outdoor
Operation
Self diagnostic
display
display
Indoor
fan lock
fan lock
Indoor fan
rpm error
rpm error
Indoor
freezing
guard
freezing
guard
Indoor
overheating
control
overheating
control
DC
overcurrent
or overheat
of the IPM
overcurrent
or overheat
of the IPM
1
2
3
4
Stops operation if no revolution pulse
signal is input from the indoor fan motor
for one minute.
signal is input from the indoor fan motor
for one minute.
Stops operation if the revolution pulse
signal from the indoor fan indicates low
rpm (approximately 300 rpm or less).
signal from the indoor fan indicates low
rpm (approximately 300 rpm or less).
Lowers the operating frequency if the
temperature of the indoor heat exchanger
goes below 5
temperature of the indoor heat exchanger
goes below 5
°
C during cooling. Stops the
compressor if the temperature stays
below 0
below 0
°
C for 4 minutes.
Stops the compressor if a current of
approximately 29A/24A
[AY-X138E/AY-X108E] or more flows in the
power transistor module. Also stops the
compressor if the temperature of the power
transistor module is exceeds 110
approximately 29A/24A
[AY-X138E/AY-X108E] or more flows in the
power transistor module. Also stops the
compressor if the temperature of the power
transistor module is exceeds 110
°
C.
Lowers the operating frequency if the
temperature of the indoor heat exchanger
rises above the overheating temperature
during heating. Stops the compressor if the
temperature stays above the overheating
temperature for 1 minute at minimum
frequency.
Set values for overheating temperature
temperature of the indoor heat exchanger
rises above the overheating temperature
during heating. Stops the compressor if the
temperature stays above the overheating
temperature for 1 minute at minimum
frequency.
Set values for overheating temperature
During normal operation: 51
°
C to 54
°
C
During full power operation: 54
°
C to
58
°
C
Operation OFF
When indoor
fan is revolving
fan is revolving
During cooling
and dry
and dry
During heating
During
compressor
operation
compressor
operation
Automatically restarts when
the exchange temperature
rises above the freezing
prevention temperature
(above 2
the exchange temperature
rises above the freezing
prevention temperature
(above 2
°
C)
Automatically restarts when
the exchange temperature
goes below the overheating
temperature.
the exchange temperature
goes below the overheating
temperature.
Automatically restarts after
safety time (170 seconds)
safety time (170 seconds)
No limit
Yes
No
No limit
No
No
No limit
No
No
4 times
Yes
Yes
FUNCTION AND OPERATION OF PROTECTIVE PROCEDURES
AH/AU-X108E
AY/AE-X108E
AH/AU-X138E
AY/AE-X138E
31
Function
NO
Description
Detection
time
time
Restart
condition
condition
Restart
times
times
Indoor Outdoor
Operation
Self diagnostic
display
display
AC
overcurrent
overcurrent
Compressor
lock
lock
Compressor
overheating
control
overheating
control
5
6
7
Lowers the operating frequency if the
temperature of the compressor chamber
thermistor (TH1) rises above 105
temperature of the compressor chamber
thermistor (TH1) rises above 105
°
C.
Stops the compressor if the thermistor
stays above 104
stays above 104
°
C for 4 minutes, or 1
minute at minimum frequency or less.
Lowers the operating frequency if the
compressor AC current exceeds
Peak control level
[10.1/8.0A (heating), 7.5/6.15A (cooling)]
[AY-X138E/AY-X108E]
Stops the compressor if the current
exceeds peak control level at 40 Hz or less.
Stops the compressor if the compressor
AC current exceeds 15A.
compressor AC current exceeds
Peak control level
[10.1/8.0A (heating), 7.5/6.15A (cooling)]
[AY-X138E/AY-X108E]
Stops the compressor if the current
exceeds peak control level at 40 Hz or less.
Stops the compressor if the compressor
AC current exceeds 15A.
During
compressor
operation
compressor
operation
Immediately
after
compressor
activation.
after
compressor
activation.
During
compressor
operation
compressor
operation
During
compressor
operation
compressor
operation
Automatically restarts after
safety time (170 seconds)
safety time (170 seconds)
Automatically restarts after
safety time (170 seconds)
safety time (170 seconds)
Automatically restarts after
safety time (170 seconds)
safety time (170 seconds)
No limit
No
No
No limit
Yes
No limit
Yes
No limit
No
No
Compressor
high
temperature
error
high
temperature
error
8
Stops the compressor if the compressor
chamber thermistor is above 114
chamber thermistor is above 114
°
C.
(Or when TH1 shorts)
During
operation
operation
Outdoor
overheating
control
overheating
control
9
Automatically restarts after
safety time ( (170 seconds)
safety time ( (170 seconds)
When
compressor
is activated
compressor
is activated
Outdoor
thermistor
short
thermistor
short
10
Stops the compressor if an outdoor
thermistor (excluding TH1) shorts.
(Except for the AU-X138E, AU-X108E)
thermistor (excluding TH1) shorts.
(Except for the AU-X138E, AU-X108E)
Automatically restarts after
safety time ( (170 seconds)
safety time ( (170 seconds)
4 times
Yes
Yes
4 times
Yes
Yes
4 times
Yes
Yes
4 times
Yes
Yes
When
compressor
is activated
compressor
is activated
Outdoor
thermistor
short
thermistor
short
11
Stops the compressor if the circuit of an
outdoor thermistor breaks.
(Except for the AU-X138E, AU-X108E)
outdoor thermistor breaks.
(Except for the AU-X138E, AU-X108E)
Automatically restarts after
safety time ( (170 seconds)
safety time ( (170 seconds)
4 times
Yes
Yes
4 times
Yes
Yes
During
compressor
operation
compressor
operation
AC
abnormal
current error
abnormal
current error
12
Stops the compressor if if the operating
frequency is above 70 Hz and the
compressor current is below 1.1 A/0.85 A.
[AE-X138E/AE-X108E]
frequency is above 70 Hz and the
compressor current is below 1.1 A/0.85 A.
[AE-X138E/AE-X108E]
Automatically restarts after
safety time ( (170 seconds)
safety time ( (170 seconds)
4 times
Yes
Yes
During
operation
operation
Serial
signal error
signal error
Four-way
valve error
valve error
13
14
Restarts after reception of
serial signal.
serial signal.
Automatically restarts after
safety time (170sec.)
safety time (170sec.)
During
operation
operation
4 minutes after
compressor
activation
compressor
activation
Stops the compressor if the outdoor unit
does not receive a serial signal from the
indoor unit for 30 seconds.
does not receive a serial signal from the
indoor unit for 30 seconds.
When the rise and fall in the detected
temperature of the outdoor heat
exchanger thermistor (TH2) do not agree
with the operating cycle.
temperature of the outdoor heat
exchanger thermistor (TH2) do not agree
with the operating cycle.
Turns the compressor relay off if the
indoor unit does not receive a serial
signal from the outdoor unit for 8 minutes.
indoor unit does not receive a serial
signal from the outdoor unit for 8 minutes.
Stops the compressor if the compressor
AC current exceeds 3.37/2.83A
[AY-X138E/AY-X108E]
immediately after activating the compressor
(at 17 to 30 Hz).
AC current exceeds 3.37/2.83A
[AY-X138E/AY-X108E]
immediately after activating the compressor
(at 17 to 30 Hz).
Lowers the operating frequency if the
temperature of the outdoor heat exchanger
rises above 57
temperature of the outdoor heat exchanger
rises above 57
°
C during cooling. Stops the
compressor if the temperature stays above
57
57
°
C for 4 minutes, or 1 minute at
minimum frequency or less.
Automatically restarts less
than 8 minutes after operation
stops.
than 8 minutes after operation
stops.
Automatically restarts
when thermistor (TH1)
temperature falls below
100
when thermistor (TH1)
temperature falls below
100
°
C (approximately 30
minutes)
AH/AU-X108E
AY/AE-X108E
AH/AU-X138E
AY/AE-X138E
32
: Blinks at 2-second intervals
: OFF
: ON
: Blinks 3 times at 0.2-second intervals
Indoor and outdoor unit
completely stopped
Indoor unit
operating
Outdoor unit
completely stopped
Display by indoor unit operation lamp
Displayed in a pattern which comes on at the same
time as the timer lamp
4 seconds off
What to check, procedure
Display by
outdoor
unit lamp
LED 1
Diagnosis
Solution
Condition
of indoor
and
outdoor
unit
Normal
Once
Twice
3 times
4 times
5 times
6 times
7 times
Compressor lock error
DC overcurrent error
AC overcurrent error
Normal
Serial short
Serial open
Does compressor active ? Does it go off immediately after active ?
1. Check the circuit in the power transistor module.
2. Is the outdoor fan revolving ?
1. Is the discharge outlet of the outdoor unit clogged ?
1. Check the wiring between units.
1. Check the wiring between units.
1. Check the wiring between units.
2. Check the fuse in the outdoor unit.
3. Indoor control board.
4. Outdoor control board.
1. Measure the resistance of thermistor TH2 on the outdoor unit
(see Figure 2).
1. Replace power transistor
module
1. Clear the discharge outlet.
8 times
4-way valve abnormal
(AE-X138E and
AE-X108E only)
1. Measure the resistance of indoor heat exchanger thermistor TH2.
2. Is the switching transistor of 4 way valve functioning normally ?
3. Is the 4 way valve functioning normally ?
1. Rewire.
1. Rewire.
Indoor fan out of order
1. Is the fan motor locked ?
2. Is the wiring connector firmly fitted ?
3. Is the speed signal applied to the motor ?
Overheat of the comp-
ressor error
(protector operating) or
outdoor compressor
thermistor TH1 short
Outdoor power supply
does't turn on.
Wiring mistake.
1. Rewire.
2.
Replace the fuse, replace the
outdoor board assembly.
3. Replace the board.
4. Replace the board.
1. Replace fan motor
2. Reattach.
3.
Replace the indoor control board
assembly.
1.
Replace indoor heat exchanger
thermistor.
2.
Replace outdoor units control board.
3.
Replace the 4 way valve.
1.
Replace the outdoor control board
assembly
(Current transformer wire break.)
1. Reattach.
2.
Replace the outdoor thermistor
assembly.
1.
Replace the outdoor thermistor
assembly.
1.
Clear the discharge outlet.
2.
Assure power supply voltage.
3.
Refill to rated amount.
4.
Replace the outdoor ther-mistor
assembly.
5.
Replace the indoor control
board
assembly or only TH2
.
1. Apply an external shock to the
compressor.
2. Replace the compressor.
1. Can voltage be detected at the current transformer on the outdoor
unit control board?
1. Are the connectors of the outdoor unit thermistors well attached ?
2. Measure the resistance of thermistors TH1 and TH2 on the
outdoor unit (see Figure 2).
1. Is the discharge outlet of the outdoor unit clogged ?
2. Is the power supply voltage at least 198 V at full power operation ?
3. Check for refrigerant leaks at the tubing connections.
4. Measure the resistance of compressor thermistor TH1 on the
outdoor unit (see Figure 2).
5. Measure the resistance of heat exchanger pipe thermistor TH2 on
the indoor unit (see Figure 1).
AC abnormal current
error
Open circuit of the
thermistor error
Short circuit of the
thermistor error
BREAK
DOWN
DIAGNOSIS
PROCEDURE
Self-diagnostic
procedure
using
display
mode
If
the
timer
lamp
blinks
during
operation,
the
problem
can
be
diagnosed
using
the
following
table.
N
o
te
:
1
.
N
o
rm
a
l
:
O
n
ly
t
h
e
t
im
e
r
la
m
p
b
lin
k
s
.
E
rr
o
r
:
D
is
p
la
y
e
d
b
y
b
lin
k
in
g
o
f
ru
n
l
a
m
p
(
a
b
o
v
e
t
a
b
le
).
2
.
If th
e power
plug is r
e
m
o
v
e
d
f
ro
m
t
h
e
o
u
tl
et
o
r t
he br
eak
e
r i
s
sw
itc
he
d t
o "O
F
F
", the
s
elf-
dia
gn
os
ti
c
me
mory will
be erased
.
3
.
E
x
a
m
p
le
o
f
o
u
td
o
o
r
u
n
it
L
E
D
1
b
lin
k
in
g
:
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