E4": Outdoor Temperature Sensor Error - Midea LRSJF-V120 Technical Manual

MCAC-RTSM-2012-07
D. "E4": Outdoor temperature sensor error
Outdoor Unit
Display
Method of
malfunction
detection
Supposed
Causes
Troubleshooting
E4
Is T3 or T4 port on PCB
loose?
The chip's pins do not match
correctly or the chip is defective.
, turn the power on again,
is"E4"displayed?
Temperature sensor
is short or defective.
NO
E4
Check whether T3 and T4 temperature sensor cable are connected correctly.
1. Temperature sensor cables don't connect correctly.
2. The sensor terminal is loose.
3. The sensor circuit is short or open
4. The main control board's clamp diodes are short or open.
NO
NO
YES
Fasten the port.
YES
Insert the chip correctly or replace it with a
fine one
YES
Replace the temperature sensor
Replace the main control
board.
M-thermal Technical Manual (part 4)