Comfort Star plus CHH030CD-410 User manual

OWNER'S MANUAL
Heat Pump Split Air Conditioner
ComfortStar AIR CONDITIONERS
Thank you for choosing ComfortStar air conditioner for correct operation,
and keep it carefully for consultation.
please read this owner's manual carefully before operating the unit

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Do not dispose this product as unsorted municipal waste.
Collection of such waste separately for special treatment
is necessary.
CONTENTS
Operation and maintenance
Notices for operation
Notices for use
Names and functions of each part
Operation of wireless remote control
Clean and care
Troubleshooting
Installation service
Notices for installation
Installation dimension diagram
Install indoor unit
Install outdoor unit
Check after installation and test operation
This symbol stands for the items
should be forbidden
This symbol stands for the items
should be followed
Emergency operation
The figures in this manual may be different with the material objects, please refer
to the material objects for reference.
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Models & Speafication
Model Number CHH030CD-410
Application Heat Pump
Power supply 1/208-230V/60 Hz
Rated cooling capacity Btu/h 28000
Rated heating capacity at 47oF Btu/h 28000
Rated heating capacity at 17oF Btu/h 17000
SEER for cooling 16
HSPF for heating 8.2
Refrigerant/charge Lb R410a˖
Compressor Type DC inverter
Compressor Brand Mitsubishi
LRA of compressor A 45
Air Florate CFM 800
Sound Level dB (A) (H/M/L) 52/50/48
Indoor unit
Fan type Cross-flow
Fan speed RPM 1400/1300/1200
Fan motor output W 40
outdoor unit
Fan type Axial-flow
Fan speed RPM 830
Fan motor output W 90
Other
Suitable Area Sq. Ft 500-1000
Max. length of line run Ft 100
Max. elevation between indoor and outdoor Ft 30
Pre-charged Ft 25
Additional Charge for extra feet oz/ft 0.53
Power Wire Gauge 3X AWG 10*
Communication Wire Gauge 3X AWG 16*
MOP (Max. Breaker Size) A 25
Weight of indoor unit Net Weight(LB) 44
Weight of outdoor unit Net Weight (LB) 154
gas 
liquid 
indoor 53.15x12.83x10
outdoor 38.58x31.1x16.8
* All Wires carry line voltage, the wire gauge on this table is factory minumum recommended size,
always refer to the local code for proper wire size
Rated current A 17.17
Line set
Body dimension (In)
A

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ƾ The power supply
must adopt the
special circuit that with air
switch protection and assure
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ƾKeep combustilble
spray away from the
units more than 1m.
ƾ
Don't block the air
intake or outlet vents
of both the outdoor and indoor
units.
It can decrease the air conditioning
capacity or cause a malfunction.
Don’t leave windows
and doors open for
a long time while operating
the air conditioner.
It can decrease the air
conditioning capacity.
It can cause a fire or explosion
Don’t attempt to
repair the air
conditioner by yourself
The wrong repair will lead to
an electric shock or fire, so
you should contact the service
center to repair.
Be sure to pull out
the power plug as
the air conditioner not in use
for a long time.
Otherwise, the accumulated
dusts that may cause over
heating or fire.
Never splice the
power cord or use
an extended cord.
It can cause overheating or
fire.
When having a
burning smell or
smoke, please turn off the
power supply and contact
with the service center.
If the abnormity still exists,
the unit may be damaged,
and may cause electric
shock or fire.
Please read the following carefully before operating
Notices for operation
components would be easily
damaged, when the voltage
is very low, the compressor
vibrates terribly and that the
refrigerant system will be
damaged, the compressor
and electric components
cannot work, the voltage
should be stable; there
shouldn’t be big fluctuation.
When the voltage
is very high, the
it has enough capacity.
The unit will be turned on or
off according to your requirement
automatically, please do not
turn on or turn off the unit
frequently, otherwise disadv-
antage effect may be caused
to the unit.

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Don’t apply the cold wind to
the body for a long time.
It can cause the health problems.
Splashing water on the air
conditioner can cause an electric
shock and malfunction
Don’t place a space heater
near the air conditioner.
Don’t blow the wind to animals
and plants directly. It can cause
a bad influence to them.
Don’t insert your hands or stick into
the air intake or outlet vents.
Don’t use the air conditioner
for other purposes, such as
drying clothes, preserving foods, etc.
To adjust the airflow direction
appropriately. When operating
the unit, to adjust the vertical air flow dire-
ction by use of remote controller.And then,
Swing louver Guide louver
Please don't cut off or damage the
power cords and control cords.
If they are damaged, please ask the qualified
personnel to change them.
Notices for operation
hold two ends of swing louver to adjust the
horizontal airflow.

3
Working principle and special functions for cooling
Principle:
Air conditioner absorbs heat in the room and transmit to outdoor and discharged, so that
indoor ambient temperature decreased, its cooling capacity will increase or decrease by
outdoor ambient temperature.
Anti-freezing function
If the unit is running in COOL mode and in low termperature, there will be frost formed on
the heat exchanger, when indoor heat exchanger temperature decreased below 0 , the
indoor unit microcomputer will stop compressor running and protect the unit.
Working principle and special functions for heating
Principle:
*Air conditioner absorbs heat from outdoor and transmits to indoor, in this way to increase
room temperature. This is the heat pump heating principle, its heating capacity will be
reduced due to outdoor temperature decrease.
*If outdoor temperature becomes very low, please operate with other heating equipments.
Defrosting:
*When outdoor temperature is low but high humidity, after a long while running, frost will
form on outdoor unit, that will effect the heating effect, at this time, the auto defrosting
function will act, the heat running will stop for 8-10mins.
*During the auto defrosting, the fan motors of indoor unit and outdoor unit will stop.
*During the defrosting, the indoor indicator flashes, the outdoor unit may emit vapor.
This is due to the defrosting, it isn't malfunction.
*After defrosting finished,the heating will recover automatically.
Anti-cool wind function:
In Heat mode, the following three kinds of status, if indoor heat exchanger hasn't achieve
certain temperature that indoor fan motor will not start, in this way to prevent blowing cool
wind (within 3mins):
The climate type of this unit is according to the nameplate.
Installation must be performed in accordance with the NEC/CEC by authorized person only．
Notices for use
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˄˅
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(3)
(6)
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Names and functions of each part
Indoor unit
Air in
Air out
Front panel
Filter
Guide louver
Wall pipe
Bind tape
Connection wire
Drainage pipe
Remote control
Outdoor unit
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ń
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Air out
Air in

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AUTO
COOL
DRY
FAN
HEAT (Note:no for coolling
FAN FAN speed button
Press this button once, fan speed will change
as below: Auto
Low speed Middle speed
High speed
Note:Under the Dry mode, the fan speed isn't
Ɣ
Simpleness swing mode is defaulted for wireless
remote control, in this mode, press this button,
(ˇ/ˉ)
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Names and functions of remote control buttons
Note: Be sure that there are no obstructions between receiver and remote control; Don't drop
or throw the remote control; Don't let any liquid in the remote control and put the remote control
directly under the sunlight or any place where is very hot
.
Signal transmitter
Remote control
ON/OFF
ON/OFF button
Press this button, the unit will be started or stopped,
which can clear the timer or sleeping function of
last time.
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only unit)
.PMET button
(ˇ/ˉ)
When press +button , the setting temp. will b e
increased by 1 ,When press -button,the
setting temp. will be decreased by 1
The temp. will be changed quickly
the button continuously and setting temp. range
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by pressing
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Operation of remote control
Swing up and down button
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below.
Press this button, the running mode will change as
Mode button
MODE
FAN
AUTO
OPER
HEALTH
AIR
FILTER
TURBO
ON/OFF
X-FAN
HOUR
HUMIDITY
ON/OFF
MODE
FAN
X-FAN
TURBO
TEMP TIMER
SLEEP LIGHT
could turn on or turn off the Up and down
swing function.
When unit is turned off, synchronously press
"+" and Up and down swing buttons, it could
be switched between the simpleness swing
mode and stationary swing mode, at this time,
blinks 2 seconds.
In Stationary swing mode, press this button,the
angle for Up and down swing as show in below:
When up and down swing louver is working,
when turn off the unit, the siwng louver will
Ɣ
immediately stop at current position.
shows up and down swing louver swings back
and forth as show in the above figure.
adjustable, low fan speed is imperative,
but when operating this button, the wireless
remote control will send this signal.
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60.8 F-86 F.

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HEALTH function:there is no this function
for this unit. If press this key, the main unit
will click, but it also runs under original status.
wireless remote control, fan speed automatically
rotates, when repress this button, the fan speed
will run at previous setting fan speed.
HEALTH SAVE
HEALTH SAVE
FAN
AUTO
OPER
HEALTH
AIR
FILTER
TURBO
ON/OFF
X-FAN
HOUR
HUMIDITY
ON/OFF
MODE
FAN
X-FAN
TURBO
TEMP TIMER
SLEEP LIGHT
Operation of remote control
TIMER
Ɣ
NOTE: This Remote control is universal, it could be used formany units, some buttons
of this control which are not available to this unit will not be described below.
On the status of the unit on, press this
button to set timer off. On the status of
the unit off, press this button to set timer
off. Press this key once, words Hour on(off)
will appear and flicker. In which case, press
+/- button to adjust time (press+/- button
the setting time range is from 0.5 to 24 hr. ;
continuously to change timing value quickly ),
then remote controller will send out the signal
immediately and hour on/off will stop flickering.
If the time of that no press timer button
under flickering status is above 5s,the timer
setting will quit. If the timer has been set,
press this button once again to quit it.
press this key once again to fix the time,
Ɣ
ƔSave energy function: this unit has no this
function, press this button, the mian unit will
click, "SE" will be displayed on the LCD of
Remote control
TURBO Turbo button
Set turbo on or off(the characters of turbo
will appear or disappear ) by pressing this
Ɣ
key under cooling or heating mode.Once
energized, the unit will be defaulted to be
turbo off. This function can not be set under
of turbo won't appear.
auto, dehumidify or fan mode, and characters
button
Timer button
Names and functions of remote control buttons
,EFTANDRIGHTSWINGBUTTON
There is no this function for this unit. If press
this key, the main unit will click, but it also
runs under original status.
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1 , 2 hours later setting temp.
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NOTE: This remote control is universal, it could be used formany units, some
buttons of this control which are not available to this unit will not be
described below.
Names and functions of remote control buttons
Operation of remote control
X-FAN button
Set X-FAN on (the characters of X-FAN will
appear)or off (the characters of X-FAN
disappear ) by pressing this key under
cool or dehumidify mode. Once energized,
the unit will be defaulted to be X-FAN off.
This function can not be set under auto,
fan or heat mode, and the characters of
X-FAN won't appear.Note:X-FAN (or BLOW
Press this button to select LIGHT on or off
in the displayer. When the LIGHT on is
set,the icon will be displayed and the
indicator light in the displayer will be on.
When the LIGHT off is set, the icon will
be displayed and the indicator light in the
displayer will be off.
Light button
LIGHT
Press this button, enter into SLEEP state,
when repressed, it will quit. The sleep function
and FAN mode.
will be canceled with the stop of the unit.
There is no SLEEP function under AUTO
is the icon for sleep
function.
SLEEP Sleep button
At COOL, X-FAN mode: the SLEEP mode runs
after 1hour, the setting temp. will be increased
by 1 , 2 hour later, setting temp. will be
increased by 2 and then will run at this
setting temperature.
after 1hour, the setting temp will be
At HEAT mode: the SLEEP mode runs
decreased by
, then it will run
at setting temperature.
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will be decreased by
2
Remote control
X-FAN
FAN
AUTO
OPER
HEALTH
AIR
FILTER
TURBO
ON/OFF
X-FAN
HOUR
HUMIDITY
ON/OFF
MODE
FAN
X-FAN
TURBO
TEMP TIMER
SLEEP LIGHT
TEMP Temp. display button
There is no this function for this unit. If press
this key, the main unit will click, but it also
runs under original status.
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same function,different name)

Guide for operation-general operation
ƾ
cheduled timer on or timer off.
ON/OFF
MODE
FAN
X-FAN
TURBO SLEEP LIGHT
TEMP TIMER
ON/OFF
MODE
FAN
X-FAN
TURBO SLEEP LIGHT
TEMP TIMER
1.Press ON/OFF button to start the unit after powering
the main unit on.(Note: Power the unit on every time,
the big -guide louver and small-guide louver will be
closed firstly.)
2.Press MODE button to select desired running mode.
3.Press +/ - button to set the desired temperature.
(It is unnecessary to set the temperature at AUTO mode)
4. Press FAN button to set fan speed, the AUTO FAN,
LOW, MID or HIGH could be selected.
5. Press button to set swing mode.
1.Press SLEEP button, set the sleep mode.
2.Press TIMER button, then press +/- button, to set the
3. Press light button to control displayer light on or off.
4. Press X-FAN button to set X-FAN function on or off.
5. Press turbo button to set this function on or off.
Guide for operation-optional operation
Introduction for special function
This function indicates that moisture on evaporator of indoor unit will be blowed after the unit
About X-FAN function
is stopped to avoid mould.
1. Having set X-FAN function on: After turning off the unit by pressing ON/OFF button
indoor fan will continue running for about 10 min. at low speed. In this period,
press X-FAN button to stop indoor fan directly.
2. Having set X-FAN function off: After turning off the unit by pressing ON/OFF button,
the complete unit will be off directly.
Operation of remote control
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Slightly to press the place with , along the arrowhead direction to push the back cover of wireless
remote control. (As show in figure)
Take out the old batteries. (As show in figure)
Insert two new AAA1.5V dry batteries, and pay attention to the polarity.
(As show in figure)
Attach the back cover of wireless remote control. (As show in figure)
When changing the batteries, do not use the old or different batteries,
If the wireless remote control will not be used for a long time, please
otherwise, it can cause the malfunction of the wireless remote control.
take them out, and don't let the leakage liquid damage the wireless
remote control.
The operation should be in its receiving range.
It should be placed at where is 1m away from the TV set or stereo sound sets.
If the wireless remote control can not operate normally, please take them out,
after 30s later and reinsert, if they cannot normally run, please change them. Sketch map for
changing batteries
127( Fig.1
Fig.2
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About lock
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will be displayed on it, in which case, press any button, the mark will
When AUTO RUN mode is selected, the setting temperature will not be displayed on the
LCD, the unit will be in accordance with the room temp. automatically to select the suitable
running method and to make ambient comfortable.
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If start this function, the unit will run at super-high fan speed to cool or heat quickly so that
the ambient temp. approachs the preset temp. as soon as possible.
Press +and - buttons simultaneously to lock or unlock the keyboard. If the remote controller
is locked, the icon
flicker for three times. If the keyboard is unlocked, the mark will disappear.
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Under status of unit off, press MODE and - buttons simultaneously to switchćDQG
It indicates: after starting this function by remote controller and the unit has been under
defrost status, If turn off the unit by remote controller, the unit will not stop defrosting until
it is finished; if change setting mode by remote controller, the function ,which is set last
time, won't be carried out until defrosting finished.
Operation of this function on or off: If remote controller is under off status, press mode button
and X-FAN button simultaneously in order to enter or cancel this new function. If the unit is under
defrost mode, dual eight position on remote controller will display H1.If switch to heat mode,
the position will display H1, which flickers for 5s, in which case, press +/- button, H1 will
disappear and setting temp. be displayed.
After remote controller is powered on , the new defrost function will be defaulted to be
closed.
Operation of remote control
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Emergency Operation
Emergency Operation
When the wireless remote control is lost or damaged, please use the manual switch, at
this time, it is running in Auto Run mode that will not change the temperature setting
value and fan speed.
The manual switch can be operated as follow:
At operation: When the unit stopped running,
press ON/OFF button, unit will enter into AUTO
RUN mode. The microcomputer will accord to
the room temperature to select the (COOL,
HEAT, FAN) mode automatically, to obtain the
comfortable effect.
At stopping:When the unit is running, press the
ON/OFF button of the manual switch, the unit
will stop work.
Manual Switch
AUTO/STOP

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Clean with a soft brush, water and neutral dete-
rgent and then dry it.(Note: Before cleaning the
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unit, please take down the displayer box firstly,
then to wash the panel, if the unit has displayer
on the front panel. Never use the water above
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to wash the panel, or it could cause
deformation or discoloration.)
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Check before use
Be sure that nothing obstructs the air outlet and intake
vents.
Check that whether ground wire is properly connected
or not.
Check that whether the batteries of air conditioner are
changed or not.
Check that whether the installation stand of the outdoor
unit is damaged or not. If damaged, please contact the dealer.
Maintain after use
Turn main power off.
Clean the filter and indoor and outdoor units' bodies.
Repaint the rubiginous place on the outdoor unit to prevent it from spreading.
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Clean and care
Take down the air filter
Cleaning
Reinsert the filters
Reinsert the filters along with the arrow head, then cover
the surface panel and clasp it.
To clean the dust adhering to the filters, you can either
use a vacuum cleaner, or wash them with warm water
(the water with the neutral detergent should below 45 ć
When the filters are very dirty (such as oil stain), and
dry it in the shade.
NOTE: Never use water above 45 ćto wash, or it can
cause deformation or discoloration. Never partch it by
fire, or can cause a fire or deformation.
At the slot of surface panel to open an angle, pull the
air filter downward and take it out.

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roub eshootin
The unit can not run.
Break off
Cooling(Heating) efficiency is not good.
Wireless remote control is not available.
If water leakage in the room.
If water leakage in outdoor unit.
Noise from indoor unit emitted.
Phenomenon Troubleshooting
Has the power been shut down?
Is voltage higher or lower?
(Tested by professionals)
Is the Timer correctly used?
Is the circuit protection device tripped off or not?
Is Temp. setting suitable?
Were inlet and outlet vents obstructed?
Are the windows and doors closed?
Did Fan speed set at low speed?
Is there any heat sources in the room?
The unit is interfered by abnormal or frequent
functions switchover occasionally the controller
cannot operate. At this time, you need to pull
out of the plug, and reinsert it.
Is it in its receiving range? Or obstructed?
To check the voltage in wireless remote control
inside is charged, otherwise to replace the
batteries.
Whether the wireless remote control is damaged.
The air humidity is on the high side.
Condensing water over flowed.
The connection position of indoor unit drainage
pipe is loosed.
When the unit is running in COOL mode, the
pipe and connection of pipe would be condensed
due to the water cooled down.
When the unit is running in Auto Defrosting mode,
the ice thawed and flowed out.
When the unit is running in HEAT mode, the
water adhered on heat exchanger dripped off.
The sound of fan or compressor relay is switching
on or off.
When the defrosting is started or stop running,
it will sound. That is due to the refrigerant flowed
to the reverse direction.
Does power plug come loose from the socket?
Is there too much dusts accumulated and
obstructed the filter?

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Troubleshooting
Malfunction Display of
nixie tube
Display of
indoor unit
Instruction
DC bus overvoltage protection PH E5 The current of DC bus is heavier than the limit current. If the malfunction occurs for 6 times
within one hour, it can not resume normal. The malfunction can only be removed after
de-energizing the unit and the re-energizing it.
Overheating protection P8 E5 The temperature of radiator is too high. It is necessary to stop the unit for cooling. If the
malfunction occurs for 6 times within one hour, it can not resume normal. The malfunction
can only be removed after de-energizing the unit and the re-energizing it.
Circuit malfunction Pc E5 The offset voltage is higher than the limit value. If the malfunction occurs for 6 times within
one hour, it can not resume normal. The malfunction can only be removed after
de-energizing the unit and the energizing it.
Module temperature sensor
malfunction
P7 E5 The module temperature sensor and the voltage-dividing resistance is short circuit or open
circuit. If the malfunction occurs for 6 times within one hour, it can not resume normal. The
malfunction can only be removed after de-energizing the unit and the re-energizing it.
Compressor overcurrent
protection
P5 E5 The instantaneous current of compressor exceeds limit value. If the malfunction occurs for 6
times within one hour, it can not resume normal. The malfunction can only be removed after
de-energizing the unit and the re-energizing it.
DC bus low voltage protection PL E5 The DC bus voltage is lower than limit value. If the malfunction occurs for 6 times within one
hour, it can not resume normal. The malfunction can only be removed after de-energizing
the unit and the re-energizing it.
Compressor startup failure Lc E5 The compressor can start but not operate. If the malfunction occurs for 6 times within one
hour, it can not resume normal. The malfunction can only be removed after de-energizing
the unit and the re-energizing it.
PFC module abnormal Hc E5 PFC module abnormality protection is detected. If the malfunction occurs for 6 times within
one hour, it can not resume normal. The malfunction can only be removed after
de-energizing the unit and the re-energizing it.
Drive chip reset P0 E5 The drive is interfered, causing restart of the procedure.
Compressor motor
desynchronizing protection
H7 E5 The rotor position can not be detected during operation. Or the actual rotational speed is
greatly different from the set rotational speed. If the malfunction occurs for 6 times within one
hour, it can not resume normal. The malfunction can only be removed after de-energizing
the unit and the re-energizing it.
Compressor lack of phase
protection
Ld E5 Any one of the phase current is lower than 0.5A (instantaneous value). The malfunction can
only be removed after de-energizing the unit and the re-energizing it.
Communication malfunction
between inverter drive and main
control
P6 E5 The drive panel can not communicate with the main control. The malfunction can resume
normal automatically.
IPM module protection H5 E5 IPM module abnormality protection is detected. If the malfunction occurs for 6 times within
one hour, it can not resume normal. The malfunction can only be removed after
de-energizing the unit and the re-energizing it.
High pressure protection E1 E1
Low pressure protection E3 E3
Check if the wire connecting high and low pressure switch and mainboard is loose. If it is
loose, tighten it. After connecting the wire, re-energized it. If there is still malfunction, replace
the pressure switch.
Discharge protection E4 E4 The compressor discharge temperature reflects the ambient temperature inside the
compressor, especially the motor coil. The high temperature will lead to decomposition of
the lubricating oil. If the discharge temperature is higher than the limit value, the compressor
and the fan will stop for protection, indoor unit displaying E4. When the discharge
temperature is lower than a certain value, the compressor will operate again. If the
malfunction occurs for several times within one hour, it can not resume normal. The
malfunction can only be removed after de-energizing the unit and the re-energizing it.
Compressor overload
protection
H3 E5 When the operation parameter (such as current) is higher than the limit value, the unit is
overloaded. It needs to be adjusted or protected. When overload protection occurs, the
compressor and the outdoor fan will stop, indoor unit displaying E5. If the malfunction is
removed, the compressor will operate again. If the malfunction occurs for several times, it
can only be removed after de-energizing the unit and the re-energizing it.
Communication malfunction
(between indoor unit, outdoor
unit and wired controller)
E6 E6 If E6 is displayed on outdoor nixie tube, check if the communication cable is well connected.
If there is wired controller, check if the unit is energized after installing the wired controller. If
the communication occurs during operation of the compressor, check if there is shield
between the main controller and communication cable. If not, change the communication
cable. Then check if the heavy current wire and weak current wire, AC wire and DC wire are
separated. Finally, replace the mainboard.
Outdoor ambient temperature
sensor malfunction
F3 F3
Discharge temperature sensor
malfunction
F4 F4
Outdoor coil middle
temperature sensor malfunction
F2 F2
Check if the wire connecting the corresponding temperature sensor and the mainboard is
loose. If it is, tighten it. If the temperature sensor on the mainboard is not loose, take it down
to measure the resistance. If the resistance is infinitely large or infinitely small (close to 0),
the temperature sensor is damaged. It is necessary to replace it.
Malfunction Code


Charge circuit malfunction PU E5 When the charge circuit starts charging, and the DC bus voltage is lower than limit value,
this protection occurs. This protection can only be removed after de-energizing the unit and
the re-energizing it.
Input AC protection PA E5 When the input instantaneous current exceeds limit value, this protection occurs. If the
malfunction occurs for 6 times within one hour, it can not resume normal. The malfunction
can only be removed after de-energizing the unit and the re-energizing it.
Display (or indicator) ambient
temperature sensor malfunction
No
malfunction
code
F5 When the temperature is detected higher or lower than limit value, it is considered to be
temperature sensor malfunction. Measure the resistance to check if it is normal. When this
malfunction occurs, F5 is displayed, without buzzer beeping. When the malfunction is
removed, the unit can operate.
Indoor temperature sensor
malfunction
No
malfunction
code
F0 When the temperature is detected higher or lower than limit value, it is considered to be
temperature sensor malfunction. Measure the resistance to check if it is normal. The
ambient temperature detected by the temperature sensor affects the operation of the unit.
Indoor antifreezing protection No
malfunction
code
E2 In Cool and Dry mode, when the evaporator temperature is lower than a certain value for a
period, the compressor will stop and the indoor fan remain the previous operation status,
displaying E2. When the compressor stop for a period and the evaporator temperature is
higher than a certain value, the malfunction will be removed and the unit will operate
according to set mode.
Evaporator temperature sensor
malfunction
No
malfunction
code
F1 When the temperature is detected higher or lower than limit value, it is considered to be
temperature sensor malfunction. Measure the resistance to check if it is normal.
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