Table of Contents
Checking
Meaning, detecting method
code
Communications with transmission
6606
processor abnormality
Communication trouble between
apparatus processor and
transmission processor.
Note:
The address/attribute shown on
remote controller indicates the
controller which has detected
error.
Checking
code
6607
No ACK abnormality
System
Generating
Display of
com-
unit
trouble
position
address
1. Outdoor
Remote
unit(OC)
controller
(RC)
2. BC
M-NET
controller
remote
(BC)
controller
(RC)
MA remote
controller
(MA)
3. Indoor
Remote
unit (IC)
controller
(RC)
4. Remote
Remote
controller
controller
(RC)
(RC)
Cause
(1) Data is not properly
transmitted due to casual
erroneous operation of the
generating controller.
(2) Faulty generating controller.
Meaning, detecting method
When no ACK signal is detected in 6 continuous times with 30 seconds
interval by transmission side controller, the transmission side detects
error.
Note : The address/attribute shown on remote controller indicates the
controller not providing the answer (ACK).
Detecting
Cause
method
No reply
(1) Poor contact of transmission
(ACK) at BC
line of OC or BC.
transmission
(2) Damping of transmission line
to OC
voltage/signal by acceptable
range of transmission wiring
exceeded.
Farthest:
Less than 200m
Remote controller wiring:
Less than 10m
(3) Erroneous sizing of
transmission line (Not within
the range below).
Wire diameter:
2
1.25mm
(4) Faulty control circuit board of
OC.
No reply
(1) When BC controller address
(ACK) at IC
is changed or modified
transmission
during operation.
to BC
(2) Faulty or disconnection of
transmission wiring of BC
controller.
(3) Disconnection of BC
controller connector (CN02).
(4) Faulty control board of BC
controller.
No reply
(1) When IC unit address is
(ACK) at RC
changed or modified during
transmission
operation.
to IC
(2) Faulty or disconnection of
transmission wiring of IC.
(3) Disconnection of IC unit
connector (CN2M).
(4) Faulty IC unit controller.
(5) Faulty remote controller.
No reply
(1) Faulty transmission wiring at
(ACK) at IC
IC unit side.
transmission
(2) Faulty transmission wiring of
to RC
RC.
(3) When remote controller
address is changed or
modified during operation.
(4) Faulty remote controller.
- 139 -
Checking method & Countermeasure
Turn off power sources of indoor unit,
and outdoor unit.
When power sources are turned
off separately, microcomputer is
not reset and normal operations
can not be restored.
→ Controller trouble is the source of the
trouble when the same trouble is
observed again.
Cause checking method &
Countermeasure
Shut down OC unit power source, and
make it again.
It will return to normal state at an
accidental case.
When normal state can not be
recovered,check for the (1) ~ (4) of the
cause.
or more
Shut down the power sources of both
OC and BC for 5 minutes or more, and
make them again.
It will return to normal state at an
accidental case.
When normal state can not be
recovered, check for (1)~(4) of the
cause.
Shut down both OC power source for 5
minutes or more, and make them
again.
It will return to normal state at an
accidental case.
When normal state can not be
recovered, check for the (1) ~ (4) of the
cause.
Shut down OC power sources for 5
minutes or more, and make it again.
It will return to normal state at an
accidental case.
When normal state can not be
recovered, check for the (1) ~ (4) of the
cause.
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Table of Contents
Troubleshooting
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