TROUBLESHOOTING
60
Procedure
E2
↓
Communication wires X Y E have short-circuited,
disconnected or
are misconnected (1)
YES
→
Reconnect the communication wires
NO
↓
Communication wires X Y E are not connected in
a loop
YES
→
Connect the communication wires in a loop
NO
↓
Wires between main PCB and electric control box
communication terminals are loose
YES
→
Ensure the wires are connected properly
NO
↓
Interference from high voltage (220V or higher)
wires
YES
→
Ensure that communication and high voltage wires
are separated
NO
↓
Communication wires are close to a
source of electromagnetic radiation
such as a transformer or strong fluorescent lamp
YES
→
Remove the source of interference, or add
additional shielding to the communication wires
NO
↓
Replacing electric control box communication
terminal block resolves the error
NO
↓
Replace the unit’s main PCB
1 Measure resistance between X Y E. Normal resistance between X and Y is 120Ω. Communication wiring has
polarity. Ensure wire X is connected to terminal X, etc.
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