NEW ENERGY NE-B245/100E Owner's manual

DC INVERTER HEAT PUMP
Installation And Operation Instruction

1
CONTENT
I. Prologue..............................................................................3
II. Parameters........................................................................4
1. Parameters...................................................................4
2. Appearance.................................................................. 4
3. Attention........................................................................ 4
III. Main introduction of product......................................... 5
IV. Installation........................................................................ 5
1. Installation.................................................................... 6
2. Piping diagram.............................................................8
3. Circuit connection....................................................... 8
V. Trial operation.................................................................12
VI. Control system instruction.......................................... 13
1. Operation illustration................................................ 13
VII. Maintenance.................................................................17
1. Maintenance protection........................................... 17
2. Error code and solution............................................17

2
Please read this manual carefully before using our products. And please install and operate the
machine in accordance with this manual, otherwise, we will not responsible for any loss.
◆This heat pump water heater must be installed by the professional technical personnel.
◆Please install the machine and connect the water pipe in accordance with this manual strictly.
◆Please arrange the professional personnel to connect the electrical circuit. The machine must be grounded
with corresponding leakage switch. For safety, please make sure to recheck everything is well before power
on.
◆When machine is operating, please prevent electric shock, pipeline and temperature sensor damage. We
will not responsible for any loss caused by above reason. If the machine has any improvement, the content is
subject to change without notice.
This appliance can be used by children aged from 8 years and above and persons with reduced
physical, sensory or mental capabilities or lack of experience and knowledge if they have been given
supervision or instruction concerning use of the appliance in a safe way and understand the hazards involved.
Children shall not play with the appliance. Cleaning and user maintenance shall not be made by children
without supervision.

3
I. Prologue
Thanks for using air source heat pump water heater! Please read this manual carefully before installation
and operation. There are information for installation, operation, maintenance, commissioning.
High design and production standard make sure air source heat pump water heater running safely and
efficient as well as excellent reliability and adaptability.
We will not responsible for any loss caused by any nonstandard operation.
The machine should be installed by qualified professional personnel and must be connected according to
the circuit diagram on the machine. The following items should be focused.
1. Before installation, please confirm if your local voltage is match with the voltage showed on the machine’s
nameplate and if the carrying capacity of the power supply, wires and sockets are suitable for this machine’s
input power.
2. Users are not allowed to change the power cord or socket. Wiring work must be carried out by a qualified
electrician and ensure that the metal part of the machine has a good grounding. Changing the ground mode
is strictly forbidden.
3. After the completion of the construction of all wiring work, please make sure to recheck everything is well
before power on.
4. Installing the machine in the place which the combustible gas may leak is strictly forbidden.
5. Do not put your hands or foreign objects into the air outlet of heat pump unit, otherwise, it will be dangerous
to the people and equipment
6. In order to obtain a better energy-saving effect, the unit should be installed in a place with well-ventilated.
7. Water used for this machine must be accordance with the national standard of living water, otherwise, if the
machine is damaged, we will not assume any responsibility.

4
II. Parameters
1. Parameters
Model Size (length*width*height)mm N.W. / G.W.(kg) Power source
NE-B245/100E 900×350×1250 75/80 220V～50Hz/60Hz
NE-B345/100E 965×354×1346 110/115 220V～50Hz/60Hz
2. Appearance
3. Attention
3.1 Please read the manual carefully before installation and using. It included all information related to correct
installation, debugging, operation, and maintenance.
3.2 Following the design standard strictly under producing, which can make sure the unit stay in safe, high
quality state, and provide high reliability and excellent adaptation.
3.3 We assume no responsibility to any personal harm or machine damage which caused by improper
debugging, unnecessary maintenance, non-compliance to manual and guidance.
3.4 The maximum water temperature is 60℃, When you use the water, please adjust the water temperature to
an appropriate temperature (The most comfortable water temperature for body is 38~42℃, if the water temp
above 50℃, there will be danger of burns!)
3.5 If the unit power off, please discharge all the water inside the unit to avoid heat exchanger frozen in winter,
otherwise, no guarantee within warranty.

5
III. Main introduction of product
1. Detail parameters
Item DC Inverter instant heating heat pump
Model NE-B245/100E NE-B345/100E
Level of security IPX4
Electric shock protection grade Ⅰ
Rated power 220V～50Hz/60Hz
Rated output water volume 245L/h 345L/h
Tank volume 80L 80L
Rated heating capacity 7200W 11100W
Rated input power/ current 1670W/7.7A 2640W/12A
Heating capacity range 3000-8500W 5000-12400W
Input power 600-1750W 1000-3200W
Max input power/ current 2100W/9.8A 3200W/14.6A
Refrigerant/ injection volume R410A/1500g R410A/2650g
Rated water temp 55℃55℃
Max water temp 60℃60℃
Unit weight 75kg 110kg
Noise ≤50dB(A) ≤50dB(A)
Tank working pressure ≤0.8MPa ≤0.8MPa
Max allowable pressure of heat exchanger 4.2MPa 4.4MPa
Max allowable pressure of high/low pressure 4.2MPa 4.4MPa
Power line install standard ≥3×2.5mm2 ≥3×2.5mm2
IV. Installation

6
1. Installation
1.1 installation position
1) The place should have enough space for installation & maintenance.
2) None block to the air inlet and outlet and none strong wind or hurricane could reach.
3) The place should well-ventilate, solid, there should be no extra running noise or vibration noise after
loading the unit.
4) The place which has enough space for air outlet, which doesn’t have combustible gas leakage.
5) Snow shelter is needed in winter.
6) The place should convenient for wiring and plumbing work.
7) Typhoon protection &lightning protection must be done when loading a unit on the roof.
8) There should be drainage channel around the unit for drain condensate water.
9) The place should have enough space for installation & maintenance.
10) Don’t install controller in bathroom, otherwise, it may affect the unit running if get humid.
11) Enough space around the unit, like this:
Air out
Air in
≥2000mm
≥300mm ≥300mm
≥300mm
Air in
1.2 Attention
Units would have faulty Installed in the following places:
1) The place has cutting oil or other mineral oil.
2) The place closes to the sea or has much salty air.
3) The place has much sulfur gases, acidic or alkaline corrosive gas, such as the hot spring area.
4) The place has strong electromagnetic wave or the factory with serious power supply voltage fluctuation.
5) The place is full of oil and gas and oil slick, such as kitchen.
1.3 Unit’s installation foundation
The installation foundation of heat pump can be concrete, steel structure, or design a flat foundation
structure according to unit weight, please see the data in the manual, anti-vibration rubber should be taken into
account, and the unit should be fixed firmly by expansion blots, then adjusting horizontal installation to
decrease it’s inclination (<2 degrees). And water drainage should be available near the installation located for
draining water in an effective way.
1.4 Safety relief valve installation requirement

7
1) Safety relief valve should install on the inlet of the water tank.
2) The drain pipe of safety relief valve should keep open with atmosphere.
3) Safety relief valve should work regularly, so as to get rid of the calcium carbonate and to approval the device
hasn’t block.
4) The drain pipe of safety relief should keep continuous downward and install in a frostless environment.
1.5 Piping installed demand
1) Select the pipe material, the choice of stainless steel, brass, plastic hot water pipes, hot water PPR tubes
meet national health and safety standards, heat-resistant, antirust and Difficult to furring.
2) Drain and overflow pipes, installed in the gutter or drain place to convenient drainage.
3) Unit and plumbing connections place must be installed stop valve or removable union, when maintenance
use.
4) Water piping arrangement is reasonable, minimize bending, and reduce the resistance of the water system.
5) System - fill water pipes, hot water supply pipe connection is completed, pipe connections must be rigor,
increase water pressure test, and drain, to ensure that the system clean. Passing the test no leakage, then
pack of pipes and valves on the heat preservation layer (Including water pipes and valves).
6) Unit water supply port must be installed filter (in accordance with the requirements of the rate water flow).
7) Circulation pipe selection: one unit's circulating pipe diameter can't less than in and out water pipe diameter,
should use the circulating pipe diameter as in and out water pipe diameter.
8) Metal pipes must be used for more than 50mm thickness of the glass fiber or high density.

8
2. Piping diagram
3. Circuit connection
3.1 Attention
Before installation, please confirm whether your local voltage is match with the voltage showed on the
machine’s nameplate and whether the carrying capacity of the power supply, wires and sockets are
suitable for this machine’s input power.
Require insurance tube: IEC regulations fuse rated current can be 90% -100% of rated nameplate
maximum current, the maximum non-fusing current overload is 150% of the nameplate rated maximum
power current;
Outdoors power lines should not be lighter than polychloroprene sheathed flexible cord(In IEC 60245 with
No. 57 line);power line specifications according to the nameplate rated maximum current selection, as
follows:

9
The minimum conductor cross-section
Rated current/A cross-section/mm
≤0.2 tinsel cordª
＞0.2&≤3 0.5ª
＞3&≤6 0.75b
＞6&≤10 1.0(0.75)b
＞10&≤16 1.5(1.0)
＞16&≤25 2.5
＞25&≤32 4
＞32&≤40 6
＞40&≤63 10
A. The length of the wire and the wire protective sleeve is less than 2m that can use this type of wire.
B. Wire length is no more than 2m, the portable appliance values in parentheses can be used
Users are not allowed to change the power cord or socket. Wiring work must be carried out by a qualified
electrician and ensure that the metal part of the machine has a good grounding. Changing the ground
mode is strictly forbidden.
After the completion of the construction of all wiring work, please make sure to recheck everything is well
before power on.
Installing the machine in the warehouse which the combustible gas may leak is strictly forbidden.
Do not put your hands or foreign objects into the air outlet of heat pump unit, otherwise, it will be
dangerous to the people and equipment.
In order to obtain a better energy-saving effect, the unit should be installed in a place with good air
circulation.
Water used for this machine must be accordance with the national standard of living water, otherwise, if
the machine is damaged, we will not assume any responsibility.
When do power connection, must be equipped with all-pole disconnect device and leakage protection
device which match the unit and have at least 3mm contact opening distance from power; If the power
cord is damaged, in order to avoid dangerous, must be replaced by a professional manufacturer, its
service department or similar departments.

10
3.2 Electric wiring diagram
3.2.1 NE-B245/100E
PE
FAN
Electronic
expansion valve
PE
White
PE
L N
Black
PE
White
FU1 T20AH 250V
Red
Black
L
Orange
N
HEATB
Black
input water temp.(White)
White
110070147
FAN
HEATC
Red
Yellow/Green
White Yellow/
Green
Black
U
compressor
Red
Chassis heater
W
V
PE
Crankshaft
electric heating
low pressure switch
discharge gas temp.(Red)
high pressure switch
Orange
output water temp.(Black)
Ambient temp..(Yellow)
coil temp..(Blue)
PE
P
Wire controller
EEV1
4 way valve
return gas temp.(Green)
P
N
L
power input
(220VAC/50-60Hz)
FANLFANH
W
V
U
4V

11
3.2.2 NE-B345/100E
（220V/1PH/50Hz/60Hz)
PE
W
V
U
PE
I1
I2
PP P
High pressure switch(Red)
Low pressure switch(Black)
Ambient temp..(Yellow)
Coil temp..(Blue)
Exhaust gas temp..(Red)
Return gas temp..(Green)
Output water temp..(Black)
Input water temp..(White)
(short-circuit)
Link switch(White)
Inductor
Crankshaft heater
Chassis heater
Four-way valve
FM2
FM1
White
White
Red
Orange Black
Black
Red
Orange
Yellow/Green
White
Black Yellow/Green
Power input
Wired
controller
Electronic
expansion
valve
COM
PE2
L N
TH1 TH2 TH3 TH4TH5 TH6
EXV
JTAG
TS1 TS3 TS4
T30AH250V
AC_L
AC_N
COM2
COM1
PE
K1K2K3K6K7
K9
OUT1OUT2OUT3
OUT6OUT7
N1N2N3
N6N7
W
V
U
PE
PE

12
V. Trial operation
Check before operating
A. Trial running must after all the installation is completed.
B. Please confirm the following matters before the trial operation, put “√”in the boxes after confirmation:
● Unit is installed correctly
● Power supply meets unit’s rated need
● Piping and wiring correct
● Unit
well-ventilated
● Drain off water well
● Leakage protective device act effectively
● Pipe insulation is perfect
● Grounding wire connected correctly
C. All wiring and piping construction work is completed, after carefully checking everything then can switch on
and the water tank fill with water.
D. Let the piping and water tank’s air drain, click "on/off" button on the control panel, unit will accord to the set
temperature operation.
E. Trial run to be checked:
Operation panel ‘s function keys are normal or not;
The indicator is normal or not;
The whole circulating hot water system whether there is water leakage;
The condensed water discharge is normal or not;
Unit’s gas system pressure is normal or not (according to the water temperature detect high, low
pressure);
Whether there is abnormal sound and vibration in unit running state;
The wind, sound and condensed water from unit whether effect to neighborhood;
Whether there is leakage of refrigerant.

13
VI. Control system instruction
1. Operation illustration
1.1 displays

14
1.2 wired controller display declaration
1.2.1 Temperature display area display system cock,timing ,running parameters, common parameters, alarm
code related datas.Left side temperature display area display actual detect tank temperature ,setting
temperature ,parameter number etc.right side temperature display area display setting
temperature ,parameters values etc.
1.3 wired controller operation
1.3.1 On/ off key :when heat pump shutdown ,press “ ” to start up the unit ;when heat pump start up press
“ ”key to shutdown the unit .When heat pump under heating start up status ,press “ ” for more than 3s
to force unit to enter defrosting function .
1.3.2 Mode key: switch mode between heating and cooling (cooling mode only available for model
NE-B345/100E)setting temperature, inquiry and setting parameters etc.
1.3.3 Temperature setting ;when wired controller under start up status ,press “ ”or “ ”key ,the “limit H”
symbol on panel and temperature value blinking display ,then press “ ”or “ ”key to add or subtract value
and press “ ” key to confirm the setting ,meanwhile “limit L” symbol on panel and temperature value
blinking display, then press “ ”or “ ”key to add or subtract value and press “ ” key to confirm the
setting or if no any operation in 20s it will exit automatically the setting temperature status and save current
modified datas;press “ ”or “ ”key more than 0.5s to quick add or subtract value .
1.3.4 Key locked function: First press “ ”, then press “ ” for 3s to enter or exit key locked function, when
“ ”symbol show up means wired controller locked.
1.3.5 Inquiry running parameters
1.3.5.1 Enter inquiry: first press “ ”then press “ ” for 3 s to enter parameters setting status, temperature
display area display parameter number, setting temperature area display parameters content.
1.3.5.2 Inquiry operation and exit: after entering running parameters, press “ ”or “ ”to display each
running parameter; press “ ”to exit inquiring parameters status or if there is not any pressing keys operation
will automatically exit inquiring parameters status.
1.3.6 Common parameters setting

15
1.3.6.1 Enter setting ;first pressing “ ” then press “ ” for 3 secs,the temperature display area display “00”
and blinking display ,input the password (default password “Fb”),then press “ ”or “ ”to add or
subtract ,press “ ”or “ ” to confirm ,if the password is wrong then exit current status ; if the password is
correct then enter parameter modification status ,temperature display area display parameters number and
blinking display ,setting temperature area display parameter content ;
1.3.6.2 Setting operation :after entering setting parameters, the parameter number blinking display ,press
“ ”or “ ”switch line to display each setting parameters number ,then press “ ”the parameters
content blinking display ,press “ ”or “ ” to modify current content ,after finishing press “ ” to save
current modification then back to parameters number display status .
1.3.6.3 Exit setting; press “ ”to exit parameters setting status or if there is not any pressing keys operation
will automatically exit parameters setting status.
1.3.7 Fault display; when unit fault occurs, the fault blinking display at setting temperature area, recycling
display fault code and temperature, after fault clear the controller recover normal display.
1.3.8 Clock setting:
1.3.8.1 Clock display: in unit shutdown status, long press any keys except “ ”, the temperature display area
display current time for one second.
1.3.8.2 Enter clock setting; long press “ ” for 3 secs.minutes part of clock area blinking display, means
entering clock setting status
1.3.8.3 Clock setting operation : enter clock setting status ,minutes part blinking display ,press “ ”or
“ ”to modify minute value .Then press “ ”,hours part blinking display ,press “ ”or “ ”to modify
hour value ,press “ ” to save current setting then exit or if there is not any pressing keys operation will
automatically save current setting then exit.
1.3.9.1 There are 2 group timing units, 1～2 group ,each timing unit group can set as “timing startup ”timing
shutdown ”.Default setting is “invalid”, means timing startup and timing timing shutdown is same.
1.3.9.2 Enter timing setting :short press “ ”,symbol “1 ”、“ON ”at left bottom screen blinking display ,minutes
display area blinking means enter “1 unit timing startup ”setting status ,the minute position blinking
display ,press “ ”or “ ”to modify minute value ,then press “ ” to confirm then enter hour setting ,the

16
hour position blinking display , press “ ”or “ ”to modify hour value ,press “ ” to confirm and “1 ”、
“OFF ”symbols blinking display .the minute position blinking display ,press “ ”or “ ”to modify minute
value ,then press “ ” to confirm then enter hour setting ,the hour position blinking display , press “ ”or
“ ”to modify hour value ,press “ ”to confirm and enter “2 unit timing startup ”，its operation same as
above .
1.3.9.3 Exit timing setting :in timing setting status ,press “ ” or in 20s without any key operations then quit
current timing setting and exit timing setting status .
1.3.9.4 Cancel timing setting; after enter timing setting status, long press “ ” for 3 secs to cancel the
configured timing function.
1.3.10 Memory function :in shutdown status ,long press “ ” for 3 secs,the LCD display “POSET”then enter
memory function setting ,press “ ”or “ ”to set value as “on” or “off ”;If value is “on ”,the wired contact
memory setting status before powering off .if value is “off ”wired controller memory shutdown status .
1.3.11 Backlight setting ; in shutdown status ,long press “ ” for 3 secs, the LCD display “LCD SET” then
enter backlight setting ,press “ ”or “ ”to adjust the brightness. Press any keys except “ ”or “ ”
to save setting or if no any keys operation in 5s the controller will save current setting and exit.
1.3.12 Running parameters list:
No.
Status name
Units
Indication
range
Remarks
d01
DC inverter compressor current actual frequency
Hz
0～150
d02
DC inverter compressor run (input )current
A
0～30.0
d03
exhaust gas temperature
℃
-15～999
d04
return gas temperature
℃
-30～999
d05
evaporator coil temperature
℃
-30～999
d06
outdoor am temperature
℃
-30～999
d07
inlet water temperature
℃
-15～999
d08
outlet water temperature
℃
-15～999
d09
Electronic expansion value pulse step count
P
0～500
pulse step count
d10
DC-link voltage
V
0～500
d11
module temperature
℃
-15～999

17
VII. Maintenance
1.Maintenance protection
1.1 Using a stiff nylon brush to clean the evaporator wings. Before scrub, clean it with vacuum cleaner. If there
is compressed air, you can use high pressure air to clean the condenser or evaporator.
1.2 Periodic inspecting if the air inlet or outlet is stopped up.
1.3 Pay close attention to the outlet, inlet/ suction pressure of the system. If there is any abnormity, find out the
reason and clearing the fault... If you cannot determine the reason, get in touch with the technician.
1.4 Periodic inspecting the electrical connections and regularly monitored the operating voltage, operating
current and phase balance. Timely to check the reliability of the electrical components, replace the expired and
unreliable parts timely.
1.5 Air source heat pump water heater uses patent heat exchanger and the outlet water temperature is high.
After long time operation, the heat transfer surface of the water side heat exchanger will be deposited calcium
oxide or any other minerals. If these minerals fouling too much on the heat transfer surface, it will effect heat
transfer performance which could lead to power consumption increase, compressor outlet pressure too high or
inlet pressure too low. So regular contaminant separation is necessary (Please use formic acid, citric acid,
acetic acid and other organic acid to clean, any cleaning agents contains chloral acid or fluoride is strictly
forbidden).
1.6 Do routine maintenance work can make more efficient use of heat pump water heaters, while for failure
problems can find in time, to avoid unnecessary trouble.
2. Error code and solution
2.1 Description of the error code
No.
Code
Fault illustration
No.
Code
Fault illustration
1
A21
Heat exchanger water tank temp.
sense fault
11
A40
Communication malfunction between
wired controller and main control panel
2
A22
Evaporator coil temp. sensor fault
12
A41
Communication malfunction between
main control panel and driver board
3
A23
Exhaust gas sensor fault
13
A42
Wired controller EEPROM fault
4
A24
Outdoor ambient temp.sensor fault
14
A43
Main control panel EEPROM fault
5
A25
Reserved
15
A61
Inverter drive module fault

18
2.2 solutions
phenomenon
reason
check
clear
The machine does
not work,
operation panel
with a display
But cannot be
switched,
button is failure
1: Operation panel line
not connected;
2: Operation board is
broken;
3: Disturbed;
4: Voltage Low;
5: The electronic
control board is broken
1: Check the line;
2: Alternative Method;
3: Check the source of interference;
4: Check the line voltage;
5: Alternative Method
1: Connect the line;
2: Change operation panel;
3: Eliminate interference source
replace line (with shield);
4: Transformation of the line or
increase Regulators;
5: Change electronic control
board
The machine does
not work,
the operation
panel display
1: Transformer is
broken;
2: Operation plate line
not connected;
3: Operation board is
broken;
4: The electronic
control board is broken
5: Disturbed
1: Measuring with a multimeter;
2: Check the line;
3: Alternative Method;
4: Alternative Method;
5: Check the interference lines have
unshielded cable or not
1: Replace the transformer;
2: Soldering iron;
3: Change the Control Panel;
4: Change electronic control
board;
5: Eliminate interference source
replace line (with shield)
Fan does not
work, and without
supply input
1: Power outages;
2 Circuit breaker;
3:The electronic control
board is broken (no
output);
4: Transformer is
broken
1: Measuring line voltage;
2: Measuring line;
3: Measure the output voltage;
4: Measuring winding, measuring the
output voltage
1: Wait to restore power;
2: Connect the line;
3: Change electric boards;
4: Change transformers
Fan does not
work, capacitor is
broken
1:Capacity
becomes smaller;
2: Open circuit;
3: Short circuit;
1: Check the capacity of the
capacitor;
2: Measuring with a multimeter;
3: Measuring with a multimeter
1: Change capacitor;
2: Change capacitor;
3: Change capacitor
Fan does not
work, motor
breaks down
1: The motor winding
road blocking, short
circuit, ground wiring
1: measuring winding
1: Change motor
Compressor does
not work, the
1: No Power;
2: Set the temperature
1: Check the operation panel;
2: Check the set temperature;
1: Power on;
2: Reset;
6
A26
Return gas sensor fault
16
A62
Compressor(input) Excessive current
fault
7
A11
Reserved
17
A63
Exhaust gas temp.overhigh protection
8
A12
LP switch abnormal failure
18
A64
Winter antifreeze protection
9
A13
HP switch abnormal failure
19
A70-A93
IPM module protection
10
A14
Reserved

19
compressor
terminals without
power (electric
control panels no
voltage output)
lower than the water
temperature;
3:The electronic control
board is broken;
4: Transformer is
broken;
5: power outages
3: Alternative Method;
4: Alternative Method;
5: Measuring line voltage
3: Change electronic control
board is broken;
4: Change transformers;
5: Wait to restore power
Compressor does
not work, when
the type of
external overload
protection
1: Capacitors is broken;
2:External overload is
broken
1: Check the capacity of the
capacitor;
2: Measure the resistance protection
1: Change capacitor;
2: Change overload protection
Compressor does
not work, when
the type of inside
overload
protection
1: Too little refrigerant
2: Low voltage;
3:The compressor
cylinder block;
4:Compressor short of
engine oil，wide noise,
temperature rise quick;
1: measured pressure, current, water
temperature parameter;
2: Measuring Voltage;
3: measuring pressure, current, water
temperature parameter;
4: Listen to the noise, measured
compressor temperature
1: Charging refrigerant;
2: Transform line or increase
Regulators;
3: parallel capacitance rushed to
open, add frozen oil;
4: add frozen oil
Unit does not
defrost,
defrost effect poor
1:Defrost temperature
sensor fault;
2:Defrost temperature
sensor loose;
3:Defrost temperature
sensor is installed at no
frost place;
4: Defrost detection
takes too long time;
5:Defrost condition
setting inappropriate;
6:Four-way valve does
not operate the
four-way valve coil is
broken;
7:Four-way valve does
not operate the
four-way valve stuck;
8:4-way valve gas
carry-over;
9:The electronic control
board is broken
1: Check the defrosting sensor
connection;
2: Check the defrosting sensor
connection;
3: Inspection;
4: Check of frost detection time;
5: Defrost temperature set point is
too high;
6: Measuring winding;
7: Knocking four-way valve;
8: Touch four-valve-pipe
temperature, measuring the current /
pressure and other parameters;
9: Forced defrost, to see whether the
electronic control board has electrical
output
1: Replace the sensor;
2: Replace the sensor;
3: Adjust the mounting position;
4: Reset the time;
5: Adjust the temperature point;
6: Replace the coil;
7: Replacing the four-way valve;
8: Replace the four-way valve;
9: Replace the control board