E2": Ui Communication Error - Midea LRSJF-V120 Technical Manual

MCAC-RTSM-2012-07
C. "E2": UI communication error
Wire
controller
Display
Method of
malfunction
detection
Supposed
Causes
Troubleshooting
E2
Turn the power supply off
once and then back on
Is normal reset
possible?
Turn the power supply off and
make sure the communication
cable is in well connection,
turn the power on again,
is"E2"displayed?
NO
E2
Check whether communication cable is normal
1. Communication cable doesn't connect correctly.
2. External factor other than malfunction.
NO
Problem could be cause by External
YES
factor (EMI, etc.) other than malfunction
YES
Replace the main control board.
Continue operation
M-thermal Technical Manual (part 4)