hajdu HB300 Installation, Usage And Maintenance Manual page 87

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following way: the air inlet closing ring has to be turned counter-clockwise, the filter
must be removed and perfectly cleaned and then it must be put back to its place.
10.11. Shutdowns not caused by errors
a) 3-minutes protection
When the appliance is under power, one must wait 3 minutes to protect the
compressor at immediate start-up after shutdown.
b) If the appliance launches a self-protection mechanism and then
shuts down, please check the following:
When the power indicator lights up, it may happen that the appliance does not
fulfil all the conditions for system start up when being switched on. One should also
check that air inlet or air outlet are not blocked or no strong draught reaches the air
outlet.
c) Defreezing
The evaporator may freeze in a wet and cold environment, so it can reduce water
heating performance. This time, the appliance is set to stop water heating, changes
to defreezing and starts water heating only then.
During defreezing, the fan stops, the four-direction valve turns the way of flow and
the compressor is operating continuously.
Defreezing may range from 3 minutes to 10 minutes, depending on the external
environment and the frost.
d) Temperature display
When the appliance stops, temperature decrease due to heat release is quite
normal. The system is started automatically after falling back to a certain heat
degree.
During water heating, the indicated water temperature may decrease for a while
or it can not increase due to heat exchange of the water. When the tank has fully
reached the pre-set temperature, the appliance stops automatically.
10.12. Errors and solutions
Malfunctioning
The outlet water is
cold. The display is
dark.
No hot water from
the outlet.
Water leakage
10.13. Self-protective mechanisms of the appliance
a) In case of self-protection, the appliance shuts down, starts auto-check
and re-starts when the defensive mechanisms are put into operation.
Reason
Check whether power supply
exists
Outlet water is set an a low
temperature; Outlet water
temperature
controller is damaged; Circuit
board of indicating indicator is
damaged;
Tap water has been cut away;
Water pressure is too low; Inlet
valve has been closed.
The joints on the pipeline are
not sealed well.
Solutions
Set outlet water at a higher
temperature;
Contact the technician.
It will return to normal after
water supplied; Use it when
the pressure is higher; Open
the inlet water valve.
Check and reseal all the
joints.