AUX air conditioner service manual
noise can be heard.
Cause analysis: according to clients description and phenomena analysis, we presumed that indoor
motor couldn’t provide power properly; checked power voltage of indoor motor, it was 100V voltage
when motor was switched off; when switched off, motor still moved slowly, and produced heat and
caused its plastic support deformed, plastic-mould motor moved from its original position, and then
wind blades touched with basement and produce unpleasant noise, and smell like something burning
can be smelt in the room. We concluded that silicon control of fan has damaged.
Solution: replace main control panel.
Experience conclusion: fan running velocity of indoor split- mounted unit is controlled by silicon
control, when electrical voltage becomes very low or fluctuates within a large range, silicon control
can be disrupted in one phase, and indoor fan still has voltage when the unit has been turned off.
Because silicon is disrupted, motor produces non-sine wave power, which cause instable running of
motor and loud noise.
Case 2 Indoor fan still runs when unit has been turned off and starts to run before it is turned on
Product Model：ASW-H12A4/HS
Phenomena: indoor fan still runs when the unit has been turned off and starts to run before it is turned
on.
Analysis: according to the client, when the unit is electrified, the client turned on the power with
remote controller and then turned off, indoor fan still run. We presumed that indoor motor fails to
provide power properly. Checked the voltage of indoor fan, motor produced 158v voltage when unit
was electrified but the unit is turned off, so motor run when motor was electrified. We concluded that
fan control silicon is broken.
Solution: unit operated normally after controller was replaced with another of same model.
Experience Conclusion: Velocity of split mounted indoor fan is controlled by silicon, when power
voltage is relative low or fluctuate within a large range, controlled silicon can be disrupted, fan still has
voltage when the unit is turned off, and can not stop running.
Case 3 Receiver of remote controller can not function properly
Product Model: ASW-H12A4/H
Phenomena: remote controller can’t turn on the unit
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