Midea M2OC-18HRDN1-M - Page 28

Indoor unit display LED STATUS
E2 Zero-crossing signal error
Indoor unit display LED STATUS
E3 Indoor fan speed out of control
Indoor unit display LED STATUS
E5 Open or short circuit of outdoor temperature sensor
Is the outdoor temperature
sensor connector and
connection good?
Repair the connector and
reconnect
Replace the sensor and
check if E5 display again?
NO
YES
Replace outdoor e-box
YES
Is the indoor fan motor
connector and connection
good?
Repair the connector and
reconnect
Is voltage being applied to
the fan motor?
(rang 90v-160v between
mid pin and N on CN1
NO
YES
Indoor PCB is defective.
Replace the indoor PCB.
YES
Replace the indoor fan
motor
NO
Is power supply and
connection of connectors
good?
Indoor PCB is defective. Replace
the indoor PCB.
Be sure the power supply is good
and correct the connection
NO
YES