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Installation & Owner‘s Manual
Table 7-1
7.2 Something about self-protection of unit
7.3 When Error happened
7.4 Error phenomenon shooting
When the self-protection happens, the system will be stopped
and start self-check, and restart when the protection resolved.
When the self-protection happens, the buzzer will buzz in every
other minute, the will flash and error code will be shown at
water temperature indicator. Press button for 1sec to
stop buzz, but the and error code does not disappear until
protection resolved.
In the following circumstance, self-protection may happen:
Air inlet or outlet is blocked;
The evaporator is covered with too much dust;
Incorrect power supply(exceeding the range of 220-240V).
If some normal errors happen, unit will automatically shift to E-
heater for emergent SHW supply, please contact qualified staff to
repair.
If some sever error happen, unit will not start, please contact
qualified staff to repair.
If some errors happen, the buzzer will buzz 3 times every other
minute and the will flash fast. Press for 1 sec to stop
the buzzer but the alarm icon will keep glittering.
Q:Why sometimes the temperature shown on the display decreased
but unit still keep closed?
A: to avoid unit ON/OFF frequently, unit will activate heat source only
when bottom tank temperature is lower than setting temperature
for at least 5 ºC.
Q:Why sometimes the temperature shown on the display will
decreased dramatically?
A: Because tank is pressure-bearable type, if there is massive hot
demand, hot water will quickly tapped out from upper part of tank
as well as cold water will quickly tapped into bottom part of tank,
if the cold water surface emerge the upper temperature sensor,
temperature shown on the display will decreased dramatically.
Q:Why sometimes the temperature shown on the display is
decreased a lot, but there is still a mount of hot water can be
tapped?
A:Because the upper water sensor is located on the upper 1/4 tank,
when tapping hot water out, it means there is at least 1/4 tank of hot
water available.
Q:Why sometimes unit shows "LA" on display ?
A: The heat pump available running ambient range is -7-43
if
ambient temperature is out of range, system will show above-
mentioned signal to let user notice it.
Q: Why something there is nothing shown on the display?
A: To maintain display screen lifespan within along term, when there
is no button operation for 30 sec, it will extinguish the display
except the LED indicator.
Q: Why sometimes the buttons are unavailable?
A: if there is no operation on panel for 1 min, unit will lock the panel,
shows " ", to unlock the panel, please press the "ENTER" button
for 3 seconds.
Q: Why sometimes there is some water flowed from drainage pipe of
PT valve?
A: Because the tank is pressure-bearable one, when water is heated
inside the tank, water will expand, so the pressure inside of tank
will increase, if pressure goes up more than 1.0Mpa, PT valve will
activate to relief the pressure and hot water drop will be discharged
correspondingly. If water drop is continually discharged from PT
valve drainage pipe, it is abnormal, please contact qualified stuff to
repair.
Error
phenomenon
Possible reason
solution
Cold water
tapped out and
display screen
extinguished
No hot water
tapped out
Water leakage
Hydraulic pipeline joints
are not sealed well.
Bad connection
between power supply
plug and socket;
Setting water
temperature too low;
Temp. sensor broken;
PCB of indicator broken.
1. Plug in;
2. Setting water temp. higher;
3. Contact service center.
Waiting for public water
supply recover;
Waiting for inlet water
pressure increase;
Open water inlet valve.
Check and reseal all joints.
Public water supply
ceased;
Cold water inlet pressure
too low (<0.15 MPa);
Cold water inlet valve
closed.
7. TROUBLE SHOOTING
7.1 Non-error tips
Q: Why compressor can't start immediately after setting?
A: Unit will wait for 3 min to balance the pressure of system before
start compressor again, it's a self protection logic of unit.
Q: Why sometimes the temperature shown on the display panel
decreased while unit is running?
A: When the upper tank temperature is much higher than the bottom
part, upper part hot water will be mixed by the bottom cold water
which is continually flow from inlet tap water so that will decrease
the upper part temperature.
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