Troubleshooting; Precautions Before Performing Inspection Or Repair; Confirmation; Judgement By Flashing Led Of Indoor/Outdoor Unit - Friedrich MW09C1H Service Manual

9. Troubleshooting

9.1 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 altitude.
* 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 mainte-
nance can be performed.
Take sufficient care to avoid directly touching any of the circuit parts without first turning off the power.
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 attached to the indoor/outdoor units.)
No. Troubleshooting procedure
1

Confirmation

2

Judgement by Flashing LED of Indoor/Outdoor Unit

3 How to Check simply the main part
9.2 Confirmation
(1)Confirmation of Power Supply
Confirm that the power breaker operates(ON) normally;
(2)Confirmation of Power Voltage
Confirm that power voltage is AC 220-240± 10%.
If power voltage is not in this range, the unit may not operate normally.
9.3 Judgement by Flashing LED of Indoor/Outdoor Unit
*Trouble shooting is for cooling and Heat Pump models.
44
115 ± 10%.
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 volt-
age 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.
Please open the outdoor unit after the unit is power off for 20min.
Troubleshooting