E3: T1 evaporator sensor malfunction.
T1 connecting wire between sensor and
mainboard gets loose.
Temperature sensor is short-circuited or
punctured.
Chip fault, or chip foot sheds off, or chip
is inverted. (correct mode is semicircular
bent alignment)
Mainboard error: for example, getting
wet.
Reconnect and ensure that the
connection is reliable.
Replace sensor.
Reinstall chip, or install other chip
with same model on the faulty unit,
to check whether there is
something wrong with chip.
Replace mainboard.
OK
OK
OK
OK
Exist
Exist
Error
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