Mitsubishi Electronics r410a Air Conditioner User Manual


 
[ IX Troubleshooting ]
- 274 -
HWE09080 GB
1. Error Code
No ACK error
2. Error definition and error detection method
The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans-
mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.)
The address/attribute appeared on the display on the remote controller indicates the controller which did not provide
the response (ACK).
3. System configuration
(3) System connected to the system controllers (MELANS)
6607
Error
source
address
Error display
Detection
method
Cause Check method and remedy
Indoor
unit
(IC)
ME remote
controller (RC)
MA remote
controller (MA)
No acknowl-
edgement
(ACK) at RC
transmis-
sion to IC
Same as grouping of units in a system
with multiple heat source units
Same remedy as that for
grouping of units in a sys-
tem with multiple heat
source units
System control-
ler (SC)
No acknowl-
edgement
(ACK) at SC
transmis-
sion to IC
1. Error occurrence on some IC Same remedy as that for
system with one heat
source unit
(1) Same cause as that for system with one
heat source unit
2. Error occurrence on all IC in the system
with one heat source unit
1) Check the LED display
for troubleshooting on the
heat source unit.
(1) Total capacity error (7100) If an error is found,
check the check code
definition, and correct
the error.
If no error is found,
check 2).
(2) Capacity code error (7101)
(3) Error in the number of connected units
(7102)
(4) Address setting error (7105)
(5) Disconnection or short circuit of the trans-
mission line for the heat source unit on
the terminal block for centralized control
line connection (TB7)
2) Check (5) - (7) on the left.
(6) Turn off the power source of the heat
source unit
(7) Malfunction of electrical system for the
heat source unit
3. Error occurrence on all IC Check voltage of the
transmission line for cen-
tralized control.
20V or more: Check (1)
and (2) on the left.
Less than 20V: Check
(3) on the left.
(1) Same causes as (1) - (7) described in 2.
(2) The male power supply connectors on 2
or more heat source units are connected
to the female power supply switch con-
nector (CN40) for the transmission line for
centralized control.
(3) Disconnection or shutdown of the power
source of the power supply unit for trans-
mission line
(4) System controller (MELANS) malfunction