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4.1.8. INDICATIONS UNDER ABNORMAL CONDITIONS
Disfunction
The RUN indicator (red) blinks.
The ALARM indicator appears on the liquid crystal display.
The indoor unit number, the alarm code and the model code are indicated on the liquid crystal display. If
several indoor units are connected, the above items are indicated one by one for each of them.
Make a note of the indications and contact your HITACHI service provider.
Power failure
All the indications disappear.
If the unit stops because of a power failure, it will not restart even when the power returns. Perform the
start-up operations again.
If the power failure lasts less than 2 seconds, the unit will automatically start up again.
Electrical noise
The indications may all be OFF and the unit stopped. This is because the microcomputer has been
activated in order to protect the unit from electrical noise.
NOTE:
If the wireless remote control switch is used for the wall-mounted indoor unit, remove the connectors
(CN25) connected to the indoor PCB. If they are not removed, the unit will not operate.
The memorized data can not be erased unless the remote control switch is initialized.
5. CHECKING PROCEDURE
1. Turn ON the power supply for all the indoor units.
2. Set the "TEST RUN" mode by pressing the "MODE" and "OK" switch
simultaneously for more than 3 seconds.
ATTENTION:
In case of the control by using two Remote controllers
(Main & Sub), the test running shall be operated by
the main controller.
NOTE:
The completion of the automatic address setting requires 3 to
5 minutes after turning ON the power supply.
The total number of the connected units is indicated on the liquid
crystal display.
Test Run
Period (min)
unit
Example when
5 indoor units
are connected
INSTALLATION MANUAL
In case that the indicated number is not correct, some
abnormalities exist, incorrect wiring, the electric noise, etc.
Turn OFF the power supply and correct the wiring after checking
the following points; (Do not repeat turning ON and OFF within
10 seconds.)
Power Supply for Indoor Unit is Not Turned ON or Incorrect
Wiring.
Incorrect Connection of Connecting Cable between Indoor Units
or Incorrect Connection of Controller Cable.
Incorrect Setting of Rotary Switch (The setting is overlapped.)
on the Indoor Units PCB.
Check to ensure that the "Test Run" mode is not set.
Set the required Test Run period by pressing
(Min. 10 minutes to Max. 600 minutes).
3. Canceling "Test Run" Mode.
When the unit is not operating, press the RESET switch.
When the unit is operating, press the RUN/STOP switch.
CAUTION:
When "00" is indicated, the auto address function may be
performing. Cancel the "Test Run" mode and set it again.
17
Indoor unit number
Alarm code
Alternating
Model code:
indication
every second
Alarm code
No. of indoor
units connected
Model code
Indication
Model
Heat pump
Inverter
Multi (Set-Free)
Only cooling
Others
Twin, triple &
Quad
and
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