13
10. Trouble shooting
Malfunction code
Malfunction
EE
Water-level alarm malfunction
E2
T1 evaporator sensor malfunction
E3
T2 evaporator sensor malfunction
E7
EEPROM communication error
E8
DC motor malfunction
10.7.1 EE:
Water-level alarm malfunction
10.7.2 E2: T1 evaporator sensor malfunction
EE: Water-level alarm malfunction
Water-level switch connecting wire
between switch and main board gets
loose
There is something wrong with the
water-level switch.
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 switch.
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
E3: T1 ev aporator sensor malfunction.
T1 connecting wire between sensor and
mainboa rd 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
E2: T1 evaporator sensor malfunction
DC Fan Coil Unit Two‐pipe Wall‐mounted Series
DC Fan Coil Unit Two‐pipe Wall‐mounted Series
