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Miswiring example
Remote
Header unit
Figure
controller
7-segment
status
display
Fig 1
No response
E19, 02
Fig 2
E04
L08
Figure
Status
The number of connected
outdoor units is few.
Fig 3
The number of connected
indoor units is few.
Fig 4
Header unit
Header unit
Uv
Uc
Uv
U1 U2 U5 U6
U1 U2 U5 U6
U1 U2
U1 U2
Uv
Uv
• Follower unit is incorrectly set to
header unit.
Header unit
Uh
U3 U4
U1 U2
A B
Uv
• Indoor/outdoor communication line is
miswired to Uh (U3/U4).
Header unit
Follower unit
Uv
Uc
Uh
U1 U2 U5 U6
U3 U4
U1 U2
U1 U2
Uv
Uv
• Outdoor communication line is miswired to Uh (U3/U4).
Header unit
Uv
U1 U2
U1 U2
A B
Uv
• Indoor/outdoor communication line is
miswired to remote controller terminal (A/B).
- 140 -
Miswiring example
Header unit
Line 1
Uc
Uv
U1 U2
U1 U2
Uv
• Indoor/outdoor communication line is
miswired to header unit of other system.
Header unit
Uv
U1 U2
Wiring forgotten
U1 U2
Uv
• Indoor/outdoor communication line is
not connected.
Miswiring example
Header unit
Uv
Uh
U1 U2 U3 U4
U1 U2
Uv
Header unit
Uv
U1 U2
U1 U2
Uv
• There is an indoor unit not connected to
the indoor/outdoor communication line.
Header unit
Line 2
Uv
U1 U2
U1 U2
Uv
U1 U2
Uv
Follower unit
Uc
U5 U6
U1 U2
Uv
Wiring forgotten
U1 U2
Uv
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Troubleshooting
