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17
• Connect it to the power supply of the outdoor units to energize the heating belt of the compressor. To protect the
compressor at startup, power it on 12 hours prior to the operation.
Check if the connections of the drainpipe and wire connection lines are correct.
The drainpipe shall be placed at the lower part while the connection line placed at the upper part. Insulating measures
should be taken such as winding the drainpipe especially on the indoor units with insulating materials.
The drain pipe should be installed as a slope to avoid protruding from the upper part and concaving at the lower part.
Checkup of Installation
Check if the mains voltage is matching
Check for any leaks at the piping joints
Check if the connection of the main power for the indoor & outdoor units are correct
Check if the serial numbers of the terminals are matched properly
Check if the installation place meets the requirement
Check if there is too much noise
Check if the connecting line is fastened
Check if the refrigerant and condensation lines are insulated
Check if the water is drained to the outside
Check if the indoor units are positioned
Test Run & Failure Code
Before Test Run
Ask the installation technician to perform a test run. Compare the testing procedures according to the manual and check if
the temperature control works properly.
When the machine fails to start because of the room temperature, the following procedure can be used to force
compulsive running mode. The function is not available for the type with remote control.
• Set the YR-E17 wired controller to cooling/heating mode, press "ON/OFF" button for 10
seconds to enter into the compulsive cooling/heating mode. Press "ON/OFF" button again to
quit the compulsive running and stop the operation of the system.
Test Run
When any fault appears, refer to “Inquiry of fault records of indoor units" at the previous page, consult the fault code of line
control or the number of LED ashes on the control panel of the indoor units/health lamp of receiving window of remote
control. Refer to the below table lookup fault descriptions.
Indoor Unit Faults
Failure code at
wired controller
PCB LED5(Indoor Units)/ Receiver
Timer Lamp (Remote Controller)
Fault Descriptions
01 1
Fault of indoor unit ambient temp. sensor TA
02 2
Fault of indoor unit pipe temp. sensor TC1
03 3
Fault of indoor unit pipe temp. sensor TC2
04 4
Fault of indoor unit dual heat source temp. sensor
05 5
Fault of indoor unit EEPROM
06 6
Fault of communication between indoor & outdoor units
07 7
Fault of communication between indoor unit and wired control
08 8
Fault of indoor unit oat switch
09 9
Fault of duplicate indoor unit address
12 12
Fault of indoor unit 50Hz Zero-crossing
14 14
Fault of indoor unit DC motor
18 18
BS valve box or 4WV switch failure
20 20 Corresponding faults of outdoor units
Fault Remedies
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