168
TROUBLESHOOTING
Error code
Contents Error detection / Judgment
RC
display
Outdoor control PCB
Code Sub code
P8 74 4 Engine speed control failure When 15 seconds or more have past after the start of the
compressor,
1. Engine speed of lower than minimum engine speed muinus
50 rpm (min
-1
) is detected for 60 seconds. OR
2. Engine speed of lower than minimum engine speed muinus
100 rpm (min
-1
) is detected for 10 seconds. OR
3. Actual engine speed deviates from the indicated speed ± 300
rpm (min
-1
) for 60 seconds.
82 0 Engine overspeed failure 1 Engine speed of maximum engine speed plus 200 rpm (min
-1
)
or higher is detected for 1 second during engine operation.
1 Engine overspeed failure 2 Engine speed of maximum engine speed plus 100 rpm (min
-1
)
or higher is detected for 10 second during engine operation.
- 3 97 Automatic address restart
(Short interruption of I/F micro-
computer)
The power supply or the I/F PCB is reset, and initial communi-
cation (automatic address) restarts.
(Master and dependent outdoor unit detection.)
98 Power ON signal is received
from the indoor unit
The indoor unit detects short break of power, and sends power
ON signal to the outdoor unit. (Master outdoor unit detection.)
99 "Normal transmission impossi-
ble" is received from the I/F
communication module
"Normal transmission impossible"
※ is received from I/F PCB.
(Outdoor unit detection.)
※ A failure detected by I/F PCB
when there is disconnection or short circuit of communication
between outdoor and indoor units, or indoor unit's power supply
is cut off.
UA 43 1 Excessed connecting all indoor
units capacity
The capacity of connected indoor units is more than the memo-
rized number of indoor units.
44 n (Air net
address)
Incorrect indoor - outdoor units
combination (Model, the num-
ber of units, etc.)
Incorrect indoor unit - remote
controller combination (Corre-
sponding remote controller)
Board type setting failure
There is a discrepancy of refrigerant type on the communication
line.
This function is also used for the specification that detects
refrigerant brand combination error.
(Indoor unit detection)
UC 36 n (Air net
address)
Address duplication Air-net address duplication. (detected only when setting remote
monitoring address)
Duplication of central control address. (Indoor unit detection)
UE 23 n (Air net
address)
Indoor unit - central controller
transmission failure
Error information is transmitted directly to the outdoor unit only
when the indoor unit does not have its own remote controller.
(Indoor unit detection)
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