Hitachi Air Conditioning and Refrigeration
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Identifying the model number

The model and serial number is located on every Hitachi unit, depending on the model the location varies. The label is silver or white and clearly marked.

System Free indoor units

System Free indoor unit labels are located close to or on the electrical cover, except the Wall mounted which is located on the left hand side of the unit.

Actual location

Indoor units Label location
Wall mount Right hand side
4 way/mini/2way Cassette Electrical cover inside filter cover
Floor mounted units Electrical cover on the left hand side
Ducted Electrical cover
Ceiling suspended Fan guard
Yutaki S Side of electrical box

Example of Cassette


Example of Wall Mounted


Outdoor Units

Utopia and Set Free outdoor units have this located on the front or Right hand side of the unit.

Actual location

outdoor units Label location
Set Free Front
Utopia Front or Right hand side/rear
Yutaki M Front

Example of Utopia outdoor unit


Room Air Conditioners

Room Air conditioners labels are located on the body of the indoor unit.

Actual location

Indoor units Label location
Wall mounted Right hand side
Cassette Inside fan cowl
In the Ceiling (Ducted) Right hand side
Floor mounted Right hand side

Example of In the Ceiling (Ducted) unit


Outdoor units

Room Air conditioners outdoor unit labels are located on the right hand side of the unit.

Samurai Chillers

Samurai Chillers labels are located on the inside of the electrical panel door.

Identifying the alarm

System free indoor units using PC-2H2/PC-P1H/PC-P2HTE/PC-ART

Alarm identify

System free indoor units using PC-ARH

System Free indoor units using PC-2H

System Free (using Infra red controllers) and all Room air conditioners

The alarm will indicate by flashing LEDs on the front of the indoor units, the number of flashes will indicate the alarm code.

Utopia, Set Free and Yutaki outdoor units

The alarm will flash on the 7 segment display on the main PCB as a 2 digit number, if a 3 digit number is shown the 1st number identifies the indoor unit that it applies to or the circuit number associated with the fault i.e 01 19 would indicate indoor unit 1 has a 19 alarm (indoor fan motor overload) 02 23 would indicate a thermistor fault on compressor number 2.


Room air conditioners

The alarm is indicated by the number of times LD301-LD304 flashes, they will flash a number of times pause for a couple of seconds and repeat the sequence.

room air

Samurai Chillers

Will light the “Alarm” LED and show the alarm on the display PCB, this will indicate the circuit number on the left hand segments and the alarm code on the right hand segments.


Normal operation

Set Free, Utopia and Yutaki units can also display a number during operation, for instance P6 this indicates a protection is active, it is not necessarily a fault, this simply means the unit is performing an action to bring its operating parameters within guidelines. This is illuminated for the duration of the action and may appear and disappear at random. These may result in alarm if repeated several times in a set period of time (dependant of code).

Yutaki units will flash between PD 22 and P5 71 this is a normal indication and is showing the current refrigerant running pressures, in the instance above 22 bar Discharge (Pd) and 7.1 bar suction (PS) the lower display will change depending on the pressure. It can also show 88 awaiting enable signal, OF temperature satisfied, PUpump operation when stopped, PU awaiting pump feedback when running orHE unit running.

RAC units will permanently light LD303 when the compressor is running; it is also possible to see LD 301 and LD302 light in early overload condition with the unit continuing to operate.

Samurai units will flash numerically between C1 and C5 on the left hand display indicating the circuit number and 88 awaiting enable signal, OF thermo off (temperature satisfied) and C0 or HE on the right hand display indicating that the unit is running in cooling or heating mode.