Mitsubishi PUMY-P100YHM Technical & Service Manual page 46

Display
Abnormal point and detecting method
Transmission bus busy error
6603
Over error by collision
Abnormality when the state, which cannot
be transmitted by collision of transmission,
is consecutive for 8 to 10minutes.
The state that data cannot to be output to
the transmission line by the noise happens
for 8 to 10 minutes consecutively.
Note) Address/Attribute displayed on the
remote controller shows the controller
detecting abnormality.
6606
Signal communication error with
transmission processor
Signal communication error between unit
processor and transmission processor
Note) Address/Attribute displayed on the
remote controller shows the controller
detecting abnormality.
Causes
1) The transmission processor cannot
be transmitted since a short cycle
voltage of the noise etc. mixes on the
transmission line consecutively.
2) The transmission volume increases
and cannot be transmitted since the
wiring method is mistaken and the
routing technique to the terminal
board (TB3) for the transmission line
of the outdoor unit and the terminal
board (TB7) for centralized control
cannot be transmitted.
3) The share becomes high since the
data exists together to other
transmitted data by a defective
repeater (function which connects and
intercepts the transmission of
controlling system and centralized
control system), and it causes
abnormal detection.
1) The data of the unit/transmission
processor was not normally
transmitted due to accidental
disturbance such as noise and
lightening surge.
2) The address transmission from the
unit processor was not normally
transmitted by the hardware of
transmission processor defective.
46
Check points
Check whether the transmission line
of the indoor unit, fresh master,
lossnay and remote controller is
connected to the outdoor unit terminal
board (TB7) for centralized controller
or not.
Check whether the transmission line
with the other refrigerant system of the
indoor unit and lossnay is connected to
the outdoor unit terminal board (TB3)
for transmission or not.
Check whether the outdoor unit
terminal board for transmission line
(TB3) and for centralized controller
(TB7) are connected or not.
Check the transmitted wave and the
noise on the transmission line.
Turn off power supply of outdoor unit,
indoor unit, and lossnay for 2minutes
or more at the same time. Then, turn
on power supply. It normally recovers
from the malfunction that happens by
chance. When same abnormality
occurs again, it is defective of the
controller.