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Procedure
Communication wires X Y E have short
circuited, disconnected or are
Communication wires X Y E are not
connected in a daisy chain
Wires between hydronic box main PCB
and electric control box communication
terminals block are loose
Interference from high voltage (220V or
Communication wires are close to a
source of electromagnetic radiation such
as transformer or strong fluorescent lamp
Replacing electric control box
communication terminals block resolves
Replace hydronic box main PCB
Notes:
1.
Measure the resistance among X, Y and E. The normal resistance between P and Q is 120Ω, between P and E is infinite, between Y and E is infinite.
Communication wiring has polarity. Ensure that the X wire is connected to X terminals and the Y wire is connected to Y terminals.
201909 45
E2
1
misconnected
No
No
No
higher) wires
No
No
the error
No
Midea CAC Confidential
Yes
Reconnect the communication wires
Connect the communication wires in a
Yes
daisy chain
Yes
Ensure the wires are connected properly
Ensure the communication wires and
Yes
high voltage wires are separated
Remove the source of interference, or
Yes
add additional shielding to the
communication wires
M‐Thermal Split
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