Panasonic CS-ME7CB1P / CS-ME10CB1P / CS-ME12CB1P / CS-ME14CB1P / CS-ME10CD3P / CS-ME14CD3P Simplified Service Manual ▷ View online
9.6.4. Self Diagnosis display
The diagnostic displays that appear when trouble has occurred can be checked using the remote control unit.
When trouble occurs, operation is stopped automatically, and the timer lamp blinks. The diagnosis time has been reduced by
warning the user by means of the blinking of the timer lamp.
When trouble occurs, operation is stopped automatically, and the timer lamp blinks. The diagnosis time has been reduced by
warning the user by means of the blinking of the timer lamp.
·
When trouble occurs, operation is stopped automatically, and the timer
lamp blinks.
lamp blinks.
·
The timer lamp will go off if the power is turned off, but it will start
blinking again if the air conditioner is operated with the trouble left
unremedied.
blinking again if the air conditioner is operated with the trouble left
unremedied.
·
No diagnostic displays will appear when the unit is operated after the
trouble has been remedied. However, the last diagnostic symbol is
stored in the IC´s memory. (This symbol can be cleared.)
trouble has been remedied. However, the last diagnostic symbol is
stored in the IC´s memory. (This symbol can be cleared.)
·
When the air conditioner protection operation is triggered because the
air conditioner is being operated under overload conditions, its heat
radiation is being interfered with or anti-freezing operation is initiated or
because its supply voltage has dropped or its power has been turned
off and then back on during operation, for instance, no diagnostic
displays will appear. However, F99 and other such information are
stored in the IC´s memory: this is normal and not indicative of
malfunctioning.
air conditioner is being operated under overload conditions, its heat
radiation is being interfered with or anti-freezing operation is initiated or
because its supply voltage has dropped or its power has been turned
off and then back on during operation, for instance, no diagnostic
displays will appear. However, F99 and other such information are
stored in the IC´s memory: this is normal and not indicative of
malfunctioning.
·
The diagnostic displays appear automatically when trouble
occurs.
occurs.
1.
Operation is stopped automatically.
2.
The timer lamp of the display unit on the indoor unit blinks.
3.
The timer lamp goes off when the power is turned off.
·
To display the trouble (or protection operation) status stored in
the memory
the memory
1.
Turn on the power.
2.
Open the remote control unit´s door, and press the timer setting
“UP-ARROW” button for 5 seconds.
“UP-ARROW” button for 5 seconds.
3.
Press the “UP-ARROW” button slowly and repeatedly until 4 beeps
are heard continuously from the indoor unit.
are heard continuously from the indoor unit.
4.
The 3-digit alphanumeric display on the remote control unit
indicates the trouble which has occurred.
indicates the trouble which has occurred.
* If the 3-digit alphanumeric display on the remote control unit
and the nature of the trouble match, the operation lamp
(green) will light.
and the nature of the trouble match, the operation lamp
(green) will light.
·
To clear the trouble (or protection operation) status stored in the
memory after remedial action has been taken
memory after remedial action has been taken
1.
Set forced cooling operation by pressing Auto button 5 to 8
seconds.
seconds.
2.
Remove the battery cover from remote control.
3.
The air conditioner can then be forcibly reset by shorting the
RESET terminals toward the main unit. (one short receiving beep)
RESET terminals toward the main unit. (one short receiving beep)
The procedure is applied to all of Cassette, Duct and Wall type models.
·
Concerning emergency operation (which can be performed in
some of the trouble conditions)
some of the trouble conditions)
1.
Using the remote control unit, select COOL or HEAT, and press
the operation OFF/ON button. (4 receiving beeps are heard, and
the timer lamp blinks.)
the operation OFF/ON button. (4 receiving beeps are heard, and
the timer lamp blinks.)
2.
The air conditioner can now be used temporarily until its trouble is
remedied.
remedied.
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CS-ME7CB1P / CS-ME10CB1P / CS-ME12CB1P / CS-ME14CB1P / CS-ME10CD3P / CS-ME14CD3P
9.6.4.1. Error Cord
Symbol
Diagnosis
Diagnosis method
H11
Indoor/Outdoor
abnormal
communication
abnormal
communication
This trouble display appears when indoor/outdoor unit communication fails to be established after 30 or more
seconds.
<Diagnosis checkpoint>
1.
seconds.
<Diagnosis checkpoint>
1.
Measure the voltages of the indoor/outdoor unit communication cables, and check whether the voltage is
being supplied properly to the outdoor unit or whether it is being returned from the outdoor unit to the
indoor units.
being supplied properly to the outdoor unit or whether it is being returned from the outdoor unit to the
indoor units.
H12
Indoor unit capacity
unmatched
unmatched
This trouble display appears when wrong in the total connection capacity and wrong connection in each
capacity.
The trouble is determined within 2 minutes after the power is turned on.
<Diagnosis checkpoint>
1.
capacity.
The trouble is determined within 2 minutes after the power is turned on.
<Diagnosis checkpoint>
1.
Check the total capacity of the units connected and check that the models are compatible for connection.
H14
Intake air temp.
sensor
sensor
This trouble display appears when the intake air temperature has exceeded above 46 °C continuously for 2
minutes or dropped below -54 °C continuously for 5 seconds during operation.
<Diagnosis checkpoint>
1.
minutes or dropped below -54 °C continuously for 5 seconds during operation.
<Diagnosis checkpoint>
1.
This trouble display appears when a temperature which is impossibly high or low from a normal standpoint
has been detected.
has been detected.
Check the sensor, and if open-circuiting (more than 500 k
Ω
) or short-circuiting (less than 6.5 k
Ω
) is not
found, defective contact of the connector is to blame.
H16
Outdoor Current
Transformer
Transformer
When the total current has dropped below the set current level continuously for 20 seconds during operation
beyond the set capacity, operation is stopped. Three minutes later, operation is started up again, and when the
trouble occurs on 4 successive occasions, the trouble display appears (the timer lamp blinks).
<Diagnosis checkpoint>
1.
beyond the set capacity, operation is stopped. Three minutes later, operation is started up again, and when the
trouble occurs on 4 successive occasions, the trouble display appears (the timer lamp blinks).
<Diagnosis checkpoint>
1.
Check the refrigerating cycle: Gas may be leaking (the amount of refrigerant is extremely low).
2.
Check the control P.C. Board: Check for a broken wire (open circuit) in the current transformer. (If an open
circuit is found, replace the control P.C. Board.)
circuit is found, replace the control P.C. Board.)
In the case of a scroll compressor (DC motor), H16 is detected only when the regular compressor is
operating.
operating.
H19
Indoor fan motor
mechanism lock
mechanism lock
·
High-voltage PWM: When a state in which the fan motor speed is not synchronized with the control signal
has been detected on 7 successive occasions:
has been detected on 7 successive occasions:
·
Low-voltage PAM: When the fan lock detection signal has been detected on 7 successive occasions or it
has been detected continuously for 25 seconds or when a state in which the fan motor speed is not
synchronized with the control signal has been detected on 7 successive occasions:
has been detected continuously for 25 seconds or when a state in which the fan motor speed is not
synchronized with the control signal has been detected on 7 successive occasions:
The trouble display appears (the timer lamp blinks).
<Diagnosis checkpoint>
1.
1.
Check the nature of the fan lockup trouble.
2.
Check for disconnections of the fan motor connectors and for defects in contact, in the fan motor and in
the control P.C. Board.
the control P.C. Board.
H21
Indoor float switch
abnormality
abnormality
Error appears when the float switch is open for 150 seconds.
<Diagnosis checkpoint>
1.
<Diagnosis checkpoint>
1.
Drain blockage
2.
Check the conductivity of float switch.
3.
Check that the resistance of the drain motor is about 200
Ω
H23
Indoor heat
exchanger temp.
sensor
exchanger temp.
sensor
This trouble display appears when a temperature of under approximately -40 °C or above approximately 80 °C
has been detected by the heat exchanger temperature sensor continuously for 5 seconds.
(This trouble is not detected during de-icing.)
<Diagnosis checkpoint>
1.
has been detected by the heat exchanger temperature sensor continuously for 5 seconds.
(This trouble is not detected during de-icing.)
<Diagnosis checkpoint>
1.
This trouble display appears when a temperature which is impossibly high or low from a normal standpoint
has been detected.
has been detected.
Check the sensor, and if open-circuiting (more than 500 k
Ω
) or short-circuiting (less than 2.5 k
Ω
) is not
found, defective contact of the connector or a defective control P.C. Board is to blame.
H27
Outdoor air temp.
sensor
sensor
This trouble display appears when a temperature of under approximately -40 °C or above approximately 150
°C has been detected by the outside air temperature sensor for 2 to 5 seconds. (This trouble is not detected
during de-icing.)
<Diagnosis checkpoint>
1.
°C has been detected by the outside air temperature sensor for 2 to 5 seconds. (This trouble is not detected
during de-icing.)
<Diagnosis checkpoint>
1.
This trouble display appears when a temperature which is impossibly high or low from a normal standpoint
has been detected.
has been detected.
Check the sensor, and if open-circuiting (more than 500 k
Ω
or short-circuiting (less than 0.5 k
Ω
) is not
found, defective contact of the connector or a defective control P.C. Board is to blame.
H28
Outdoor heat
exchanger temp.
sensor 1
exchanger temp.
sensor 1
This trouble display appears when a temperature of under approximately -60 °C or above approximately 110
°C has been detected by the heat exchanger temperature sensor for 2 to 5 seconds. (This trouble is not
detected during de-icing.)
<Diagnosis checkpoint>
1.
°C has been detected by the heat exchanger temperature sensor for 2 to 5 seconds. (This trouble is not
detected during de-icing.)
<Diagnosis checkpoint>
1.
This trouble display appears when a temperature which is impossibly high or low from a normal standpoint
has been detected.
has been detected.
Check the sensor, and if open-circuiting (more than 500 k
Ω
) or short-circuiting (less than 0.5 k
Ω
) is not
found, defective contact of the connector or a defective control P.C. Board is to blame.
26
CS-ME7CB1P / CS-ME10CB1P / CS-ME12CB1P / CS-ME14CB1P / CS-ME10CD3P / CS-ME14CD3P
Symbol
Diagnosis
Diagnosis method
H30
Outdoor discharge
pipe temp. sensor
pipe temp. sensor
Disconnected discharge sensor
·
When the condensation temperature is higher than the discharge temperature + (plus) 6 °C, a sensor
disconnection is detected, operation stops, and the trouble display appears (the timer lamp blinks).
disconnection is detected, operation stops, and the trouble display appears (the timer lamp blinks).
<Diagnosis checkpoint>
1.
1.
This trouble display appears when a temperature which is impossibly high or low from a normal standpoint
has been detected.
has been detected.
Check the sensor, and if open-circuiting (more than 500 k
Ω
) or short-circuiting (less than 0.5 k
Ω
) is not
found, defective contact of the connector or a defective control P.C. Board is to blame.
H32
Outdoor heat
exchanger temp.
sensor 2
(discharge pipe
temp.)
exchanger temp.
sensor 2
(discharge pipe
temp.)
This trouble display appears when a temperature of under approximately -60 °C or over approximately 110 °C
has been detected continuously for 2 to 5 seconds by the outlet temperature sensor of the heat exchanger.
<Diagnosis checkpoint>
1.
has been detected continuously for 2 to 5 seconds by the outlet temperature sensor of the heat exchanger.
<Diagnosis checkpoint>
1.
This trouble display appears when a temperature which is impossibly high or low from a normal standpoint
has been detected.
has been detected.
Check the sensor, and if open-circuiting (more than 500 k
Ω
) or short-circuiting (less than 0.5 k
Ω
) is not
found, defective contact of the connector or a defective control P.C. Board is to blame.
H34
Outdoor heat sink
temp. sensor
temp. sensor
This trouble display appears when a temperature of under -43 °C or above 80 °C has been detected by the
outdoor unit radiator fin sensor continuously for 2 seconds.
<Diagnosis checkpoint>
1.
outdoor unit radiator fin sensor continuously for 2 seconds.
<Diagnosis checkpoint>
1.
This trouble display appears when a temperature which is impossibly high or low from a normal standpoint
has been detected.
has been detected.
Check the sensor, and if open-circuiting (more than 500 k
Ω
) or short-circuiting (less than 0.5 k
Ω
) is not
found, defective contact of the connector or a defective control P.C. Board is to blame.
H35
Drainage or drain
pump abnormality
pump abnormality
This error appears if the float switch is open three times for ten seconds or more during a twenty-minute
period.
<Diagnosis checkpoint>
1.
period.
<Diagnosis checkpoint>
1.
Drain blockage
2.
Check the conductivity of float switch.
3.
Check that the resistance of the drain motor is about 200
Ω
H36
Outdoor gas pipe
temp. sensor
temp. sensor
This trouble display appears when a temperature of under approximately -45 °C or above approximately 149
°C has been detected by the outdoor unit gas side pipe temperature sensor continuously for 2 to 5 seconds.
<Diagnosis checkpoint>
1.
°C has been detected by the outdoor unit gas side pipe temperature sensor continuously for 2 to 5 seconds.
<Diagnosis checkpoint>
1.
This trouble display appears when a temperature which is impossibly high or low from a normal standpoint
has been detected.
has been detected.
Check the sensor, and if open-circuiting (more than 500 k
Ω
) or short-circuiting (less than 0.5 k
Ω
) is not
found, defective contact of the connector or a defective control P.C. Board is to blame.
H37
Outdoor liquid pipe
temp. sensor
temp. sensor
This trouble display appears when a temperature of under -45 °C or above 149 °C has been detected by the
outdoor unit liquid side pipe temperature sensor continuously for 2 seconds.
<Diagnosis checkpoint>
1.
outdoor unit liquid side pipe temperature sensor continuously for 2 seconds.
<Diagnosis checkpoint>
1.
This trouble display appears when a temperature which is impossibly high or low from a normal standpoint
has been detected.
has been detected.
Check the sensor, and if open-circuiting (more than 500 k
Ω
) or short-circuiting (less than 0.5 k
Ω
) is not
found, defective contact of the connector or a defective control P.C. Board is to blame.
H39
Abnormal indoor
operating unit or
standby units
operating unit or
standby units
This display appears in rooms other than one in which indoor freezing trouble has occurred when the pipes
have been connected incorrectly, when an outdoor expansion valve is defective or when an expansion valve
connector has become disconnected.
have been connected incorrectly, when an outdoor expansion valve is defective or when an expansion valve
connector has become disconnected.
H41
Abnormal wiring or
piping connection
piping connection
CU-2E only
This display appears when this kind of trouble is detected 3 minutes after a forced cooling operation was
conducted for one room during the initial operation after the power was turned on. It appears when:
This display appears when this kind of trouble is detected 3 minutes after a forced cooling operation was
conducted for one room during the initial operation after the power was turned on. It appears when:
·
The indoor unit pipe temperature in a room without the capacity supply available at an outside air
temperature above 5 °C has dropped by more than 20 °C to 5 °C or lower 3 minutes after the compressor
started up.
temperature above 5 °C has dropped by more than 20 °C to 5 °C or lower 3 minutes after the compressor
started up.
·
The outdoor unit gas pipe temperature in a room without the capacity supply available has dropped by
more than 5 °C to 5 °C or lower 3 minutes after the compressor started up.
more than 5 °C to 5 °C or lower 3 minutes after the compressor started up.
H97
Outdoor fan motor
mechanism lock
mechanism lock
When the fan motor speed detected when its maximum output is demanded is below 30 rpm continuously for
15 seconds, the fan motor stops for 3 minutes and then restarted.
When this happens on 16 occasions (the trouble display is cleared when the value is normal for 5 minutes),
the H97 diagnostic symbol is stored in the memory, and the fan motor stops.
<Diagnosis checkpoint>
1.
15 seconds, the fan motor stops for 3 minutes and then restarted.
When this happens on 16 occasions (the trouble display is cleared when the value is normal for 5 minutes),
the H97 diagnostic symbol is stored in the memory, and the fan motor stops.
<Diagnosis checkpoint>
1.
Check the nature of the fan lockup trouble.
2.
Check for disconnections of the fan motor connectors and for defects in contact, in the fan motor and in
the control P.C. Board.
the control P.C. Board.
H98
Indoor high pressure
protection
protection
The restriction on the compressor frequency is started when the temperature of the indoor unit heat exchanger
source is between 50 °C and 52 °C, the compressor stops at a temperature from 62 °C to 65 °C, it is restarted
3 minutes later at below 62 °C to 65 °C, and the restriction on the compressor frequency is released at a
temperature between 48 °C and 50 °C. (No trouble display appears.)
<Diagnosis checkpoint>
1.
source is between 50 °C and 52 °C, the compressor stops at a temperature from 62 °C to 65 °C, it is restarted
3 minutes later at below 62 °C to 65 °C, and the restriction on the compressor frequency is released at a
temperature between 48 °C and 50 °C. (No trouble display appears.)
<Diagnosis checkpoint>
1.
Check the indoor unit heat exchanger temperature sensor (check for changes in its characteristics and
check its resistance): Symptoms include no hot start when operation is started, a failure of the thermostat
to turn on (no outdoor unit operation). And frequent repetition of stopping and startup.
check its resistance): Symptoms include no hot start when operation is started, a failure of the thermostat
to turn on (no outdoor unit operation). And frequent repetition of stopping and startup.
2.
Check also for short circuits indoors and clogging of the air filters.
27
CS-ME7CB1P / CS-ME10CB1P / CS-ME12CB1P / CS-ME14CB1P / CS-ME10CD3P / CS-ME14CD3P
Symbol
Diagnosis
Diagnosis method
H99
Indoor operating unit
freezing
freezing
The restriction on the compressor frequency is started when the indoor unit heat exchanger temperature is
between 8 °C and 12 °C. Operation stops if a temperature below 0 °C continues for 6 minutes. Three minutes
later, operation is started up at a temperature from 3 °C to 8 °C. The restriction on the compressor frequency
is released at a temperature between 13 °C and 14 °C.
<Diagnosis checkpoint>
1.
between 8 °C and 12 °C. Operation stops if a temperature below 0 °C continues for 6 minutes. Three minutes
later, operation is started up at a temperature from 3 °C to 8 °C. The restriction on the compressor frequency
is released at a temperature between 13 °C and 14 °C.
<Diagnosis checkpoint>
1.
A cooling or dry mode operation conducted at a low outside air temperature is mainly to blame:
this is not indicative of any malfunctioning.
this is not indicative of any malfunctioning.
If the outside air temperature rises during automatic operation in the winter months, the dry mode
operation is selected. The H99 diagnostic display also appears at such a time.
operation is selected. The H99 diagnostic display also appears at such a time.
2.
Check the refrigerating cycle: Gas may be leaking (the amount of refrigerant is low) or a pipe may be
broken, etc.
broken, etc.
3.
Check also for short circuits indoors and clogging of the air filters.
F11
4-way valve switching
failure
failure
When a difference of 0 °C to 5 °C has been detected between the outdoor unit heat exchanger temperature
and liquid side pipe temperature on 5 occasions, the trouble display appears.
<Diagnosis checkpoint>
1.
and liquid side pipe temperature on 5 occasions, the trouble display appears.
<Diagnosis checkpoint>
1.
Check the 4-way valve coil: Check that no power is supplied to the coil during cooling and dry mode
operations, and that power is supplied during heating operations. Inspect the coil for broken wires (open
circuits).
operations, and that power is supplied during heating operations. Inspect the coil for broken wires (open
circuits).
2.
If the coil is trouble-free, the switching action of the 4-way valve may be defective.
F17
Indoor standby units
freezing
freezing
When the difference of an intake temperature (room temperature sensor) and the indoor unit heat exchanger
temperature (piping sensor) is higher than 10 °C or an indoor unit heat exchanger temperature of below -1 °C
has been detected continuously for 5 minutes, operation stops. Three minutes later, it is started up, and the
trouble display appears when this has occurred on 3 consecutive occasions.
<Diagnosis checkpoint>
1.
temperature (piping sensor) is higher than 10 °C or an indoor unit heat exchanger temperature of below -1 °C
has been detected continuously for 5 minutes, operation stops. Three minutes later, it is started up, and the
trouble display appears when this has occurred on 3 consecutive occasions.
<Diagnosis checkpoint>
1.
Check the refrigerating cycle: Expansion valve leakage
2.
Check the indoor unit pipe temperature sensor (check for changes in its characteristics and check its
resistance).
resistance).
F90
PFC circuit protection When a DC voltage over 393V to 424V has been detected on 16 occasions, this trouble display appears.
<Diagnosis checkpoint>
1.
1.
To check whether the shutting valve has been left close by mistake, operation is performed for one to
several minutes after the compressor has started up, F93 is stored in the memory as the symptom, and
operation stops.
several minutes after the compressor has started up, F93 is stored in the memory as the symptom, and
operation stops.
2.
Check the inverter circuit (for open circuits) in the control P.C. Board: Check the IPM base current (6
locations) within 3 minutes after the power has been turned back on. As the symptom, F93 is stored in the
memory 30 seconds after the compressor has started up, and operation stops. The trouble display
appears after 4 restarts.
locations) within 3 minutes after the power has been turned back on. As the symptom, F93 is stored in the
memory 30 seconds after the compressor has started up, and operation stops. The trouble display
appears after 4 restarts.
3.
Check for broken wires (open circuits) in the compressor winding: Approximately 1 ohm under normal
conditions for each phase (same symptom as in 2.)
conditions for each phase (same symptom as in 2.)
4.
Check the power supply voltage has been fluctuating or not.
F91
Refrigeration cycle
abnormality
abnormality
When the compressor frequency is above 55 Hz and the current drops below the prescribed level continuously
for 7 minutes, operation stops, and it is restarted 3 minutes later.
When the compressor discharge temperature has exceeded the setting and the expansion valve has remained
fully open for 80 seconds, operation stops, and it is restarted 3 minutes later.
When the stopping described above has occurred on 4 occasions, operation stops, and the trouble display
appears.
<Diagnosis checkpoint>
1.
for 7 minutes, operation stops, and it is restarted 3 minutes later.
When the compressor discharge temperature has exceeded the setting and the expansion valve has remained
fully open for 80 seconds, operation stops, and it is restarted 3 minutes later.
When the stopping described above has occurred on 4 occasions, operation stops, and the trouble display
appears.
<Diagnosis checkpoint>
1.
Check the refrigerating cycle: Gas may be leaking (more than one-half of the volume of the gas has gone).
The diagnostic displays resulting from a gas leak generally change in the following sequence depending
on the extent of the gas leak: H99
The diagnostic displays resulting from a gas leak generally change in the following sequence depending
on the extent of the gas leak: H99
→
F97
→
F91
→
H16.
The range of this trouble (F91) is limited. (Compressor protection at the start of the season)
F93
Compressor
abnormal revolution
abnormal revolution
When a state in which the rotation of the compressor is not synchronized with the control signal has been
detected on 8 successive occasions, operation stops, and the trouble display appears.
<Diagnosis checkpoint>
1.
detected on 8 successive occasions, operation stops, and the trouble display appears.
<Diagnosis checkpoint>
1.
To check whether the shutting valve has been left close by mistake, operation is performed for one to
several minutes after the compressor has started up, F93 is stored in the memory as the symptom, and
operation stops.
several minutes after the compressor has started up, F93 is stored in the memory as the symptom, and
operation stops.
2.
Check the inverter circuit (for open circuits) in the control P.C. Board: Check the IPM base current (6
locations) within 3 minutes after the power has been turned back on. As the symptom, F93 is stored in the
memory 30 seconds after the compressor has started up, and operation stops. The trouble display
appears after 4 restarts.
locations) within 3 minutes after the power has been turned back on. As the symptom, F93 is stored in the
memory 30 seconds after the compressor has started up, and operation stops. The trouble display
appears after 4 restarts.
3.
Check for broken wires (open circuits) in the compressor winding: Approximately 1 ohm under normal
conditions for each phase (same symptom as in 2.)
conditions for each phase (same symptom as in 2.)
F95
Outdoor high
pressure protection
pressure protection
CU-2E only
When the temperature of the outdoor unit heat exchanger temperature sensor exceeds 62 °C, the F95
diagnostic symbol is stored in the memory, and operation stops. 13 minutes later, operation is restarted at a
temperature below 48 °C. This trouble display appears when this happens on 4 occasions in a 20-minute
period.
<Diagnosis checkpoint>
1.
When the temperature of the outdoor unit heat exchanger temperature sensor exceeds 62 °C, the F95
diagnostic symbol is stored in the memory, and operation stops. 13 minutes later, operation is restarted at a
temperature below 48 °C. This trouble display appears when this happens on 4 occasions in a 20-minute
period.
<Diagnosis checkpoint>
1.
Check the outdoor unit heat exchanger temperature sensor (check for changes in its characteristics and
check its resistance).
check its resistance).
2.
Check whether something is interfering with the dissipation of the heat outdoors.
28
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