Midea Super DC Series - Page 190

Troubleshooting
Electrical Control System 188
2.4.3 Units with TWINS Function (for the Super-Slim Cassette & A5 Duct)
2.4.3.1 Communication Malfunction between Master Unit and Indoor Unit
F3 Displayed
F3 Displayed
Communication failure between
master unit and slave unit
Communication failure between
master unit and slave unit
Check the dial switch settings of
master unit and slave unit. Are they
correct?
Check the dial switch settings of
master unit and slave unit. Are they
correct?
Correct the
settings
Correct the
settings
No
Check the PQE communication wires
connection, is it wired properly?
Check the PQE communication wires
connection, is it wired properly?
Yes
Correct the wire
connections
Correct the wire
connections
No
One of the 2 indoor PCBs is defective.
Connect only one indoor unit to the outdoor
unit separately. The one that displays an E1
error code is defective
One of the 2 indoor PCBs is defective.
Connect only one indoor unit to the outdoor
unit separately. The one that displays an E1
error code is defective
Yes
2.4.3.2 Other Malfunction between Master Unit and Indoor Unit
One indoor unit displays ”E9”, which means the other indoor unit is faulty. Check the other indoor unit’s error
code and then follow the prescribed solutions to resolve the malfunction.
E8