Troubleshooting At The Outdoor Unit - Mitsubishi Electric FDF100VSXVD Technical Manual

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Troubleshooting at the outdoor unit

LED), and then proceed further inspection and remedy it.
making a diagnosis of not only the anomaly of microcomutor, but also the anomaly in power supply system, installation space,
overload resulting from improper charging amount of refrigerant and etc.
after automatical recovering from malfunction.
After automatical recovering from malfunction, if any another error mode which has a higher priority than the previous error
saved in memory occurs, it is overwritten in memory and is displayed.
[Reset of power supply]
Be sure to avoid electrical shock, when replacing or checking the outdoor control PCB, because some voltage is still retained in
the electrolytic capacitor on the PCB even after shutting down tne power supply to the outdoor unit.
(Measurment of voltage may be disturbed by the moisture-proof coating. In such case, remove the coating and measure it by
taking care of avoiding electrical shock)
(a) Module of part to be replaced for outdoor unit controller
Outdoor control PCB, Inverter PCB, Temperature thermistor (of outdoor heat exchanger, discharge pipe, outdoor air,
(b) Replacement procedure of outdoor control PCB
Since the following precaution is the important contents for safety, be sure to observe them.
WARNING and CAUTION are described as follows:
WARNING
CAUTION
Securely replace the PCB according to this procedure.
If the PCB is incorrectly replaced, it will cause an electric shock or fire.
Be sure to check that the power source for the outdoor unit is turned OFF before replacing the
PCB. The PCB replacement under current-carrying will cause an electric shock or fire.
After finishing the PCB replacement, check that wiring is correctly connected with the PCB before
power distribution. If the PCB is incorrectly replaced, it will cause an electric shock or fire.
Band the wiring so as not to tense because it will cause an electric shock.
Precautions for Safety
Indicates an imminently hazardous situation which will result in death or serious
injury if proper safety procedures and instructions are not adhered to.
Indicates a potentially hazardous situation which may result in minor or moderate
injury if proper safety procedures and instructions are not adhered to.
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WARNING
CAUTION
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'11 • PAC-T-160