8. TROUBLESHOOTING
8-1. Precautions before Performing Inspection or Repair
8-2. Confirmation
Be caution during installation and maintenance. Do operation following the regulations to avoid electric shock and
casualty or even death due to drop from high attitude.
At times 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 to the attached on 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 be open after the unit is de-energized for 20 minutes.
<Troubleshooting procedure>
8-2. Confirmation
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 power 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 the voltage tester.
Take sufficient care to avoid directly touching any of the circuit parts without first turning off the power.
After ensure insulation place and safety, the maintenance can be performed.
To avoid electrical shock hazard, be sure to disconnect power before
attempting to disassemble the unit.
When a footstool, etc. is used for disassembling the indoor unit,
be careful not to fall down. If you fall down, you might be injured seriously.
Warning
8-3. Troubleshooting from Error Display
8-4. How to check the main part
(1) Confirmation of Power Supply
Confirm that the power breaker operates (ON) normally.
(2) Confirmation of Power Voltage
Confirm that the power voltage is AC 220V +/- 10%, AC 230V +/- 10% or AC 240V +/- 10%.
If power voltage is not in this range, the unit may not operate normally.
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