172
TROUBLESHOOTING
Error code
Contents Error detection / Judgment
RC
display
Outdoor control PCB
Code Sub code
U7 4 1 Communication failure between
outdoor units 2
<Automatic address setting failure>
Master unit: When any of the following occurs.
1. Memorized address of the outdoor unit connected to the
indoor unit is a dependent unit address.
2. There are 3 or more dependent units.
3. As for combined installation, start signal from the dependent
unit has discrepancy 10 times in a row.
4. The detected number of connected dependent units is more
than memorized number.
5. Memorized automatic address and not memorized ones are
mixed in the combined installation communication.
6. The master unit serial number memorized in the dependent
unit does not agree with the actual master unit serial number.
(Excluding when the master unit serial number is not memo-
rized.)
7. Automatic address setting completion direction is sent 10
times or more when memorized address is not yet decided.
2 Communication failure between
outdoor units 3
<Model settings do not agree under combined installation>
Master unit: Model setting of master and dependent do not
agree
Dependent unit: Dependent unit receives combined installa-
tion model settings discrepancy from the master unit.
3 Communication failure between
outdoor units 4
<Automatic address memory data failure under combined
installation>
The following outdoor unit data are not memorized in com-
bined installation automatic address, master unit memory or
dependent unit memory.
1. Outdoor unit address
2. The number of connected indoor units
3. Outdoor unit serial number (Master unit: Other than FF is
unacceptable / Dependent unit: FF is unacceptable)
4 Communication failure between
outdoor units 5
<Insufficient number of connected dependent units under
combined installation>
The confirmed number of connected outdoor units is lower
than the memorized number of outdoor units.
5 Communication failure between
outdoor units 6
<Automatic address setting time out under combined installa-
tion>
Automatic address setting under combined installation does
not terminate 10 minutes after starting to send the first
"Automatic address setting start under combined installation"
signal.
(If automatic address under combined installation is not memo-
rized, error decision terminates when check direction to the
service person is displayed. If automatic address under
combined installation is memorized, error decision terminates
when "automatic address under combined installation"
terminates.)
To Next Page
Loading...
Need help?
General