Mitsubishi Electric PURY-100TMU, Service Handbook

Page: 106 / 121

–105–
Checking code Meaning, detecting method Cause Checking method & Countermeasure
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:
The address/attribute
shown on remote control-
ler indicates the control-
ler which has detected
error.
1 The communication between
the MA remote control and the
indoor units is not conducted
normally.
2 When the data were not able
to receive normally even once
for three minutes.
1 The communication between
the MA remote control and the
indoor units is not conducted
normally.
2 When the data were not able
to receive normally even once
for two minutes.
1 The communication between
the MA remote control and the
indoor units is not conducted
normally.
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
1 The communication between
the MA remote control and the
indoor units is not conducted
normally.
2 When different conditions
continued 30 times compared
to the receiving transmitted
data simultaneously
1) At the collision of mutual transmis-
sion data when transmission wiring
is modified or the polarity is
changed while turning the power
source on, the wave shape changes
detecting error.
2) Repeating of transmission error due
to noise.
3) Damping of transmission line volt-
age/signal due to exceeding of the
acceptable range for transmission
wiring.
• Farthest
Less than 200m (656.2ft)
• RC wiring Less than 12m (39ft)
4) Damping of transmission voltage/
signal due to improper type of
transmission line.
• Wire size : More than 1.25mm
2
(AWG16)
1) Poor contact of the remote control
line of the MA remote control or the
indoor units
2) All remote controls are slave units.
3) Wiring protocol is not observed.
1
Length of wiring
2
Wiring thickness
3
Remote control unit number
4
indoor unit number
4) After connecting the remote control
at one time, the remote control was
removed without resetting power
supply.
5) Noise intrusion onto the transmis-
sion line of the remote control
6) Circuit failure of the remote control
transmit/receive of the indoor units
7) Circuit failure of the remote control
transmit/receive
1) Poor contact of the remote control
line of the MA remote control or the
indoor units
2) Set up over two units of the master
remote control.
3) Set up duplication of the indoor unit
address.
4) Noise intrusion onto the remote
control line.
5) Wiring protocol is not observed.
1
Length of wiring
2
Wiring thickness
3
Remote control unit number
4
indoor unit number
6) Circuit failure of the remote control
transmit/receive
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 <Investigation method
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.
6608
6831
6834
6832
6833
MA Not
receiving
communica-
tions abnor-
mality
MA Communi-
cations
starting
abnormality
MA Communi-
cations
Synchronous
recovery
Abnormality
MA Communi-
cations
Transmit/
receive
Hardware
Abnormality
* When SW4-5 is turned OFF, “
°
F” is indicated, while when SW4-5 is turned ON, “
°
C” is indicated.