54 8.4 Sequential Start
Fundamental of DIII-NET
8.4 Sequential Start
<Operation command from central control equipment>
Each unit operates in sequence. For example, if you set the simultaneous operation by the central remote controller,
which controls 1-00 ~ 4-15 and 5-00 ~ 8-15 groups, two outdoor units start simultaneously.
8.5 Under Central Control
C : 3P171361-1
8.6 Error Code on Intial Setting and Wiring Troubles
3P124623-5C
Malfunction code Contents of malfunction
M1 Failure of PC board of schedule timer.
Fixes
The following causes are possible. Check each one.
1. PC board problems
M8 Malfunction of transmission between each optional controllers for centralized control.
Fixes
Check all central devices which are connected (e.g., power supply, transmission wiring, etc.).
MA Improper combination of optional controllers for centralized control.
Fixes
The following causes are possible. Check each one.
1. Are all central devices combined correctly?
2. Is the master central connector attached to two or more central devices?
3. Are there 128 or more indoor units connected?
MC Address failure of schedule timer.
Fixes
The following causes are possible. Check each one.
1. Do the control range addresses in the central remote controller overlap?
2. Do the control range addresses in the on/off controller overlap?
3. Are there 2 or more schedule timers connected?
U4 Transmission error between indoor unit/BEV unit and outdoor/BS unit, Transmission error between outdoor unit
and BS unit
U5 Transmission error between remote controller and indoor control unit
U5 Remote controller board fault or remote controller setting fault
U6 Transmission error between indoor units
U7 Transmission error between outdoor units
Transmission error between outdoor unit and ice thermal storage unit
U7 Transmission error between outdoor units
(cooling/heating batch, low-noise operation)
U8 Transmission error between master remote controller and slave remote controller (slave remote controller error)
Incorrect combination of indoor unit and remote controller within a single system (model)
U9 Transmission error between indoor unit/BEV unit and outdoor unit within a single system
Transmission error between BS unit and indoor unit/BEV unit and outdoor unit within a single system
UC Central control group numbers overlap
UE Malfunction of transmission between indoor unit and optional controllers for centralized control.
Fixes
Inspect all indoor units which are displaying an error (e.g., power supply, transmission wiring, etc.).
— Malfunction in indoor unit (Refer to the malfunction codes of the indoor remote controller, while also read the
“ CAUTION FOR SERVICING ” attached to the indoor unit.)
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