Midea MLCAC-UTSM-2010-10

MLCAC-UTSM-2010-10 Troubleshooting
Outdoor Units 83
2. E2 malfunction
E2 display
Communication malfunction between indoor IC and outdoor IC
Judge 3: Check whether the signal wiring between the indoor and
outdoor units is wrong polarity?
Connect the signal wiring correctly
Yes
No
Judge 4: Check whether the signal wiring between the indoor and
outdoor units is broken?
Yes
Replace the broken wiring
No
Judge 2: Check whether the signal wiring is shield cable or whether
the shield cable is earthed
Yes
Adopt the shield cable/ let shield cable earthed
No
Indoor or outdoor main board is broken. Replace the main
board until the malfunction disappears.
Judge 1: Check whether the indoor unit power is on
Turn on the indoor unit power
No
Yes