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6607
No ACK (Acknowledgement)
Abnormality which controller of the
sending side detects when there is no
answer (ACK) from other side though data
was transmitted once. It is detected 6
times every 30 seconds continuously.
Factor that not related to origin
Turn off power supply of outdoor unit,
indoor unit fresh master and lossnay
for 2 minutes or more at the same
time. Then, turn on power supply. It
recovers normally at the malfunction
that happens accidentally.
Note) Address/Attribute displayed on the
remote controller shows the controller,
which did not send back replay (ACK).
1) Since the address switch was
changed with the passed current, the
unit in the last address does not exist.
Check the address switch in the
address, which occurs abnormality.
2)
Decline of transmission voltage and
signal by transmission cable tolerance
over
Check whether the transmission cable
is connected / loosen or not at origin.
(Terminal board or connector)
· The furthest point···200m
Check whether the transmission
cable tolerance is over or not.
· Remote controller cable···(12m)
(Refer to 8-3.)
Check whether the kind of
transmission cable is mistaken or not.
3)
Decline of transmission cable voltage
and signal by unmatched kind of cable.
When there is any trouble from above
1-5, turn off power supply of outdoor
unit, indoor unit and lossnay for
2 minutes or more at the same time.
Then, turn on power supply.
· Shield cable-CVVS,CPEVS
When there is not any trouble in
single refrigerant system (1outdoor
unit) from above1-5, controller is
defective in displayed address and
attribute.
When there is not any trouble in
different refrigerant system (2outdoor
unit or more) from above1-5,
determine it after 6.
When the address, which should not
exist, is an origin, since there is the
indoor unit which memorizes the
address data, cancel the unnecessary
address data by the manual setting
function of remote controller.
Cable diameter···1.25 e or more
However, they are limited to the
system, which sets the group between
different refrigerant systems, or which
fresh master /lossnay are connected.
4) Decline of transmission cable
voltage and signal by a number of
over-connected units.
When there is not any trouble from
above 1-6, replace the displayed
address/attribute controller board.
5) Mis-operation of origin controller,
which happens accidentally
In this time, when the error does not
recover to normal, the outdoor unit
multi controller board (repeater circuit)
defective is expected.
6) Origin controller defective
1) When the cause of displayed address
and attribute is on the outdoor unit side.
1) Contact failure of outdoor unit or
indoor unit transmission cable.
(The indoor unit detects when there is no
reply (ACK) on transmitting from the
indoor unit to the outdoor unit.)
2) Indoor unit transmission connector
(CN2M) disconnection.
3) Sending/receiving signal circuit
failure in the indoor/outdoor unit.
2) When the cause of displayed address
and attribute is on the indoor unit side.
1) When operating with multi
refrigerant system indoor units, the
remote controller transmits the
signal to the indoor unit after the
other refrigerant system outdoor unit
is turned off or turned on again in
2 minutes, and detects abnormality.
(The remote controller detects when
there is no reply (ACK) on transmitting
from the remote controller to the indoor
unit.)
2) Contact failure of remote controller
or indoor unit transmission cable
3) Indoor unit transmission connector
(CN2M) disconnection
Check the recovery by replacing the
multi controller board one by one.
4) Sending/receiving signal circuit
failure in the indoor unit or remote
controller
1
1
2
3
4
5
6
Display
Abnormal point and detecting method
Causes
Check points
From the preceding page.
Continued to the next page.
OC376B--2.qxp 08.1.17 1:15 PM Page 47