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Instantaneous overcurrent (outdoor unit)
L5
Possible earth fault or short circuit in the compressor motor.
Electric thermal (outdoor unit)
L8
Possible electrical overload in the compressor or cut line in the compressor motor.
Stall prevention (outdoor unit)
L9
Compressor possibly locked.
LC
Transmission malfunction between the outdoor control units' inverters (outdoor unit)
P1
Open-phase (outdoor unit)
P3
P-board temperature sensor malfunction (outdoor unit)
P4
Heat-radiating fin temperature sensor malfunction (outdoor unit)
Type set improper (outdoor unit)
PJ
Capacity data is wrongly proset. Or there is nothing programmed in the data hold IC.
U0
Suction pipe temperature abnormal
Reverse phase
U1
Reverse two phase of the L1,L2and L3 leads.
Power source voltage malfunction (outdoor unit)
U2
Includes the defect in 52C.
Transmission error (indoor unit – outdoor unit)
U4
Wrong wiring between indoor and outdoor units or malfunction of the PC board
UF
mounted on the indoor and the outdoor units.
Transmission error (indoor unit – remote controller)
U5
Transmission is improper between the indoor unit and the remote controller.
Miss setting for multi system
UA
Setting is wrong for selector switch of multi-system. (see switch SS2 on the main
unit's PC board)
UE
Transmission error (indoor unit - central controller)
UC
Central control address overlapping
CAUTION
• Refer to "2. Items to be checked at time of delivery" on page 4 upon completion of the test run and make
sure that all the items are checked.
• If the customer's interior work has not been finished on completion of the test run, explain the customer
not to operate the air conditioner. This is essential until the interior work is finished so as to protect the
product.
Substances generated from paints and adhesives used for the interior work may contaminate the product
if the unit is operated.
To test run Contractors
When delivering the product to the customer after the test run is completed, check that the control box lid,
the air filter and the suction grille are mounted. In addition, explain to the customer regarding the state
(ON/OFF) of the power supply breaker.
13. WIRING DIAGRAM
(Refer to Fig. 37)
28
English
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