Table of Contents
Checking code
Meaning, detecting method
6608
No response error
Though acknowledgement of re-
ceipt (ACK) is received after
transmission, no response com-
mand is returned.
Detected as error by transmission
side when the same symptom is
repeated 10 times with an inter-
val of 3 seconds.
Note:
6831
MA Not
1 The communication between
receiving
the MA remote control and the
communica-
indoor units is not conducted
tions abnor-
normally.
mality
2 When the data were not able
to receive normally even once
for three minutes.
6834
MA Communi-
1 The communication between
cations
the MA remote control and the
starting
indoor units is not conducted
abnormality
normally.
2 When the data were not able
to receive normally even once
for two minutes.
6832
MA Communi-
1 The communication between
cations
the MA remote control and the
Synchronous
indoor units is not conducted
recovery
normally.
Abnormality
2 When the transmission could
not be made without being
able to verify space of the
transmission line
indoor units: for three minutes
Remote control: for six seconds
6833
MA Communi-
1 The communication between
cations
the MA remote control and the
Transmit/
indoor units is not conducted
receive
normally.
Hardware
2 When different conditions
Abnormality
continued 30 times compared
to the receiving transmitted
data simultaneously
* When SW4-5 is turned OFF, "°F" is indicated, while when SW4-5 is turned ON, "°C" is indicated.
1) At the collision of mutual transmis-
2) Repeating of transmission error due
3) Damping of transmission line volt-
The address/attribute
shown on remote control-
ler indicates the control-
4) Damping of transmission voltage/
ler which has detected
error.
1) Poor contact of the remote control
2) All remote controls are slave units.
3) Wiring protocol is not observed.
4) After connecting the remote control
5) Noise intrusion onto the transmis-
6) Circuit failure of the remote control
7) Circuit failure of the remote control
1) Poor contact of the remote control
2) Set up over two units of the master
3) Set up duplication of the indoor unit
4) Noise intrusion onto the remote
5) Wiring protocol is not observed.
6) Circuit failure of the remote control
Cause
sion data when transmission wiring
is modified or the polarity is
changed while turning the power
source on, the wave shape changes
detecting error.
to noise.
age/signal due to exceeding of the
acceptable range for transmission
wiring.
• Farthest
Less than 200m (656.2ft)
• RC wiring Less than 12m (39ft)
signal due to improper type of
transmission line.
2
• Wire size : More than 1.25mm
(AWG16)
line of the MA remote control or the
indoor units
1 Length of wiring
2 Wiring thickness
3 Remote control unit number
4 indoor unit number
at one time, the remote control was
removed without resetting power
supply.
sion line of the remote control
transmit/receive of the indoor units
transmit/receive
line of the MA remote control or the
indoor units
remote control.
address.
control line.
1 Length of wiring
2 Wiring thickness
3 Remote control unit number
4 indoor unit number
transmit/receive
–105–
Checking method & Countermeasure
a) Generation at test run.
Turn off the power sources of outdoor
unit (OC), indoor unit (IC) and Fresh
Master for more than 5 minutes si-
multaneously, and make them again.
→ Returning to normal state means
the trouble detection due to trans-
mission line work while powering.
b) Check 3) and 4) of the causes left.
c) Investigate the transmission wave
shape/noise on transmission line
according to
of transmission wave shape/
noise>.
Much possibility if 6602 is
generated.
1 Verify coming-off and loosening of
transmission line of indoor units or
the MA remote control.
2 Verify feeding to the main power
supply and the remote control line.
3 Verify whether the allowance range
of the MA remote control line is over
or not.
4 Check the master/slave setting of
the MA remote control.
5 Perform the remote control diagno-
sis (remote IM is listed)
Results:
[OK]: No problems with the remote
control (Wiring protocol
check)
[NG]: Remote control replacement
[6832, 6833, ERC]: Noise is at-
tributable to
causes (to 6)
6 Investigate the transmitted wave
form on the MA remote control line
transmitted signal and noise.
7 In the case of no problems in the
above-mentioned 1 - 6, replace
the interior controller board or the
MA remote control.
Below conditions can be verified by
LED1 and LED2 on the interior con-
troller board.
• LED1 is lit up simultaneously.
The main power supply is turned
on to the indoor units.
• Only LED2 is lit up.
This light-up means that power
is feeding to the MA remote con-
trol line.
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