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104
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'19 • SCM-SM-281
(4) Troubleshooting at the outdoor unit
When troubleshooting the outdoor unit, rstly assess the overview of malfunction and try to presume the cause and the
faulty part by checking the error code dispalyed on the remote control and then proceed further inspection and remedy
it.
Self-diagnosis system by microcomputer on indoor unit PCB can assist to nd the cause of malfunction smoothly
by making a diagnosis of not only the anomaly of microcomputer, but also the anomaly in power source system,
installation space, overload resulting from improper charging amount of refrigerant and etc.
Unless the power is reset, the error log is saved in memory.
After automatically 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 source]
Be sure to avoid electrical shock, when replacing or checking the outdoor unit control PCB, because some voltage is
still retained in the electrolytic capacitor on the PCB even after shutting down the power source to the outdoor unit.
Be sure to start repairing work and reconrming that voltage has been discharged sufciently by measuring the voltage
(DC) between both terminals of electrolytic capacitor (C58).
(Measurement 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 control
Outdoor unit PCB, Temperature sensor (of outdoor heat exchanger, discharge pipe, outdoor air), Fuses (for power
source and PCB) and Reactor.
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