ets loose
Reconnect and ensure
that the connection is
reliable.
There is something wrong
with the water-level switch
Exist
Replace switch
Chip fault, or chip foot sheds off, or chip is
inverted (correct mode is semicircular bent
alignment)
Error
Reinstall chip, or install other chip
with same model on the faulty unit,
to check whether there is
something wrong with chip.
Main board error:
For example,
getting wet
Replace
main board
OK
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