Troubleshooting - Airwell CADE024 Service Manual

12—TROUBLESHOOTING
12.

TROUBLESHOOTING

12.1 ELECTRICAL & CONTROL TROUBLESHOOTING
12.1.1 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 suffi cient care to avoid directly touching any of the circuit parts without fi rst 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
12.1.2 Confi rmation
12.1.2.1 Confi rmation of Power Supply Confi rm that the power breaker
12.1.2.2 Confi rmation of Power Voltage Confi rm that power voltage is
12.1.3 Judgment by Indoor/Outdoor Unit Diagnostics
Diagnostic from IDU Display:
If the malfunction still exists 4min later after stop of unit due to compressor protection, error code will
be directly displayed though indoor display. In other situations, error code can be displayed by pressing
LIGHT button 6 times within 4s.
The fault code could be shown in following way:
The Fault codes can be displayed by 2*7 segments (on IDU Display board)
Blinking of IDU LEDs (RUN,COOL,HEAT) can also show the information of fault code.
All fault code could be shown on RCWE
The ODU can only show ODU fault by 2x7 segments on outdoor Main Board.
12—1 | SM YUDE 1-A.1 GB
operates(ON) normally;
AC220~240V +/-10% for single phase and AC380-415V+/-10%
for three phase. If power voltage is not in this range, the unit may
not operate normally.