Midea MKG Series Technical & Service Manual page 31

AC Fan Coil Unit Two-pipe Wall-mounted Series
12.7.1 E2: Room temperature T1 sensor check channel is abnormal.
E2: Room temperature T1 sensor check
channel is abnormal.
T1 connecting wire between sensor and
main board gets loose
Temperature sensor is short-circuited or
Chip fault or chip foot sheds odd or chip is
inverted.(correct mode is semicircular
Main board error: for example, getting
12.7.2 E3: T2 evaporator sensor malfunction
E3: T2 evaporator sensor malfunction E2: T2 ev aporator se nsor malfunction
T2 connecting wire between sensor and
Temperature sensor is short-circuited or
Chip fault, or chip foot sheds off, or chip
is inverted. (correct mode is semicircular
Mainboard error: for example, getting
12.7.3 E7: EEprom malfunction
No
No
punctured
No
bent alignment)
No
wet.
mainboard gets loo se.
OK
pun ctured.
OK
ben t alignment)
OK
wet.
E7 : EEprom malfunction.
Replace indoor main PCB board
Reconnect and ensure that the
Yes
connection is reliable.
Yes Replace sensor.
Reinstall chip or install other chip
with same model on the faulty unit to
Yes
check whether there is something
wrong with the chip.
Yes Replace main board.
Exist
Reconnect and ensur e that
the conne ction is reliable.
Exist
Rep lace sensor.
Re install chip, or install
other chip with same
Error
model on the fau lty unit, to
check whether the re is
something wrong with chip.
Rep lace mainboard.
- 30 -
No
OK