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Error Code
When the system is turned
on or working, the wired
controller displays code
"E4" and the buzzer
alarms the fault.
When the system is turned
on or working, the wired
controller displays code
"E5" and the buzzer
alarms the fault.
During the system working
process, the wired
controller displays code
"E6" and the buzzer
alarms the fault.
When the system is turned
on or working, the wired
controller displays "E7" and
the buzzer alarms the fault.
When the system is turned
on or working, the wired
controller displays code
"E8" and the buzzer
alarms the fault.
During the system working
process, the wired
controller displays "En"
and the buzzer alarms the
fault.
Fault alarm release and reset method: If the above code appears, please check the waterway, the gas path is
normal, press "Switch button" to turn off or turn off the power to restart. The water heater is restored to normal use.
lf the above operations cannot be resumed, please notify the after-sales service personnel.
Possible Cause
1. The inlet water temperature sensor
connector is loose or has poor contact.
2. The inlet water temperature sensor is
damaged (open circuit, short circuit or
metal parts).
1. The fan signal is not detected or the
speed is too low in the system startup 5S.
2. During operation, the fan speed is not
detected for 2S consecutively, or the
speed is too low.
3. The power supply voltage is too low,
causing the fan speed to slow down.
1. The gas supply pressure or gas
composition does not match, causing
abnormal combustion.
2. The control program or parameter
settings are incorrect, resulting in
abnormal combustion.
3, The water temperature sensor
specifications do not match, the display
temperature is much higher than the
actual temperature.
4. The combustion system is damaged or
the specifications are inconsistent,
resulting in abnormal combustion.
5. The heat exchanger fins of the heat
exchanger are poorly welded, and the
heat transfer is slow. After the water valve
is closed, the water in the tube is
continuously heated.
1. The valve connector is loose or has poor
contact.
2. The valve is short-circuited.
1. During operation, the fan speed
continuously exceeds the set value of 5S
speed.
2. The outdoor wind pressure is too high,
and the fan speed exceeds the upper
limit of the speed.
3. A large amount of carbon in the heat
exchange fins (when the gas source is
used incorrectly), causing blocked, and
the fan speed increase exceeds the
upper limit of the speed.
In order to prevent oxygen deficiency,
some models have timing protection.
Please turn off the tap and use it after a
while.
Fault Handling
1. Clamp the water temperature sensor
terminal.
2. Replace the water temperature sensor.
1. The fan assembly, controller damage or
line failure, causing the fan not to run or
the speed is too low, check the fan, the
main controller is damaged, the wiring
is damaged, loose, replace the
damaged parts.
2. Confirm whether the power supply and
fan voltage meet the design
requirements.
1. Confirm that the gas type and pressure
meet the requirements of the water
heater.
2. Check whether the program and
parameters meet the values of the
parameter table.
3. Test whether the actual water outlet
temperature and the wired controller
display temperature are close(±3 °C),
and replace the wrong outlet water
temperature sensor.
4. Check the combustion system for
damage and replace damaged parts.
5. Detect if the heat exchanger fins are
poorly welded and replace the
damaged parts.
1. Clamp the water temperature sensor
terminal.
2. Check if the valve coil is short- circuited
and replace the damaged parts.
1. Check if the exhaust passage is blocked.
2. Stop starting, and start after no strong
wind in the outdoor.
3. Remove the heat exchanger, use a brush
to gently clean the carbon on the
fins,and ensure that the type and
pressure of the gas used subsequently
meet the requirements of the water
heater.
1. Set the appropriate time according to
the usage habits, and the timed
shutdown time can be set to 20, 30, 40,
50, 60 minutes.
2. It is not necessary to set "OF" to turn off
the timing function.
Troubleshooting
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