ULT Energy-saving Series
After-sales Service Manual
49
Treatment method of high temperature alarm:
Display temperature of the freezer ≥
setting temperature of high temperature
alarm (setting temperature of high
temperature alarm ≥ setting temperature
of ope 5°C)
No (normal case)
Sound alarm after 15 minutes of
light flashing alarm
Check whether the display of
input voltage is normal
Check whether the low temperature
stage compressor is normal
Check whether the low
temperature stage fan is normal
Check whether the high temperature
stage fan is normal
Check whether the currents of high
temperature stage compressor and low
temperature stage compressor are normal
Yes
No
Yes
Yes
Check whether the power
supply is normal
No
Check whether the fan is
normal or the control circuit
is normal
No
Check
whether
the
compressor is normal or the
control circuit is normal
No
Check whether the fan is
normal or the control circuit
is normal
No
Check whether the fan is
normal or the control circuit
is normal
Yes
Yes
Yes
Yes
The "Alarm" light flashes;
the "High temperature
alarm" light flashes
Check the LED light and
control circuit of the display
board
Yes
Check the buzzer and control
circuit of the control board
No
Yes
Check
whether
the
compressor is normal or the
control circuit is normal
Check whether the high temperature
stage compressor is normal
Check for refrigerant leakage
No