13. TROUBLESHOOTING
13.1 ELECTRICAL & CONTROL TROUBLESHOOTING
13.1.1 Precautions before Performing Inspection or Repair
Be cautious during installation and maintenance. Do operation following the regulations to avoid
electric shock and casualty or even death due to drop from high attitude.
* Static maintenance is the maintenance during de-energization of the air conditioner.
For static maintenance, make sure that the unit is de-energized and the plug is disconnected.
*Dynamic maintenance is the maintenance during energization of the unit. Before dynamic
maintenance, check the electricity and ensure that there is ground wire on the site. Check if there is
electricity on the housing and connection copper pipe of the air conditioner with voltage tester. After
ensure insulation place and the safety, the maintenance can be performed.
Take sufficient care to avoid directly touching any of the circuit parts without first turning off the power.
At time such as when the circuit board is to be replaced, place the circuit board assembly in a vertical
position. Normally, diagnose troubles according to the trouble diagnosis procedure as described
below.(Refer to the check points in servicing written on the wiring diagrams attached to the
indoor/outdoor units.)
Precautions when inspecting the control section of the outdoor unit: A large-
capacity electrolytic capacitor is used in the outdoor unit controller (inverter).Therefore,if the
power supply is turned off, charge(charging voltage DC280V to
380V)remains and discharging takes a lot of time. After turning off the power source,if touching the
charging section before discharging, an electrical shock may be caused.
The outdoor unit can not be started up until the unit is de-energized for 20min
13.1.2 Confirmation
13.1.2.1 Confirmation of Power Supply Confirm that the power breaker operates(ON)
normally;
13.1.2.2 Confirmation of Power Voltage Confirm that power voltage is AC220~240V +/-
10%. If power voltage is not in this range, the unit may not operate normally.
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