Haier DW-86L338J Service Manual page 45

ULT Energy-saving Series After-sales Service Manual
B. Excessive temperature difference between upper and lower parts of the freezer:
Because the freezer starts cooling top down, the temperature on the top is lower than that at the bottom, besides,
there is also a large temperature difference between the upper and lower parts. The temperature difference of similar
products in the world is between 5~8°C, and that of our products is basically not higher than 6°C. In addition,
frequent opening and closing of the door by users will cause large temperature difference between the upper and
lower parts;
C. What is voltage increase start?
In order to ensure the normal operation, the freezer has the function of increasing or reducing the voltage. When the
user's voltage is lower than 183 V, the freezer cannot be started, and at this time, the user needs to check whether the
circuit is normal;
D. How the temperature rises to -82°C if the user set the temperature at -86°C?
In order to ensure the service life of the freezer, the products are designed as below: when the ambient temperature
is higher than 35°C, if the setting temperature is lower than -82°C, it will be adjusted to -82°C. If the ambient
temperature is lower than 30°C (including 30°C), it will get back to the original setting value.
E. Why does the temperature rise quickly when opening the door? Why are other brands slow in temperature
rise?
(1) The temperature of the ULT Freezer is low, and there is a large temperature difference between the freezer
temperature and the ambient temperature. Our freezer's temperature sensing probe is more sensitive, so the
temperature rises quickly when opening the door;
(2) Other brands have added the function of slow temperature rise in the design of computer board and temperature
sensing probe, so the temperature rises slowly when opening the door or the same temperature as that before
opening the door for a long time (such as products of Meling).
F. What is the reason for displaying E0 and other symbols?
It displays E2 for main sensor fault, E1 for condenser sensor fault, and E0 for ambient temperature sensor fault.
Check whether the circuits are normal, otherwise carry out maintenance or replacement by after-sales personnel.
G. How to deal with the movement of the freezer when opening the door?
Equipped with casters, the freezer is flexible, movable, lockable and supportable, and can realize micro adjustment
according to requirements; After the freezer is installed at the user's designated position, the front two casters should
be fixed to prevent the freezer from moving when opening the door.
H. Why does the door of the ULT Freezer cannot be opened?
There are two cases:
The first is that the temperature difference between inside and outside is large, which leads to the negative pressure
of the door. The treatment method is as follows: insert a piece of thin iron sheet between the door seal strip and the
door body to let the air enter;
The other case is that there is moisture when the user stores goods, which causes the water to freeze at the seal strip
and the door cannot be opened. The treatment method is to open the door with a tool.
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