Mitsubishi Electric PUHY-HP144TSHMU-A Service Handbook page 168

[ IX Troubleshooting ]
1. Error Code
6607
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)
Error
source Error display
address
System M-NET re-
controller mote controller
(SC) (RC)
MA remote
controller
(MA)
HWE0716A
Detection
method
No acknowl- 1. Error display on some displays on
edgement M-NET remote controllers
(ACK) at IC
(1) Faulty wiring of the transmission
transmission to
line for M-NET remote controller
SC
(2) Disconnection or contact failure of
the transmission connector for M-
NET remote controller
(3) M-NET remote controller failure
2. Error occurrence on all IC in the
system with one outdoor unit
(1) An error is found by the outdoor
unit.
Total capacity error (7100)
Capacity code error (7101)
Error in the number of connected
units (7102)
Address setting error (7105)
(2) Disconnection or short circuit of the
transmission line for the outdoor
unit on the terminal block for cen-
tralized control line connection
(TB7)
(3) Turn off the power source of the
outdoor unit
(4) Malfunction of electrical system for
the outdoor unit
3. Error display on all displays on M-
NET remote controllers
(1) Same causes as (1) - (4) described
in 2.
(2) When the power supply unit for
transmission lines is used and the
male power supply connector is
connected to the female power sup-
ply switch connector (CN40) for the
transmission line for centralized
control
(3) Disconnection or shutdown of the
power source of the power supply
unit for transmission line
(4) System controller (MELANS) mal-
function
- 159 -
Cause Check method and remedy
Check (1) - (3) on the left.
1) Check the LED display for
troubleshooting on the out-
door unit.
2) Check (2) - (4) on the left.
Check (1) - (4) on the left
If an error is found, check
the check code definition,
and correct the error.
If no error is found, check
the cause 2)
GB