AUX air conditioner service manual
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the lamp was turned off, air conditioner functioned properly. When lamp was turned on, we checked
receiver and found 2V AC electricity on the input end; when we turned out the lamp, and didn’t
operate remote controller, there’s no voltage on receiver.
Solution: replace fluorescent lamp with product of other brand
Experience Conclusion: wave produced by electron rectifier fluorescent lamp may superpose on
infrared wave and cause failure of receiver. To fix such kind of failure, we shall asked client for details
and check surrounding electrical appliances of air condition. Interference resources of air conditioner
signal include electromagnetic interference due to poor quality of power circuit, frequency interference,
and infrared interference. To fix the failure, we shall put a transparent dark-color light-filtering plate in
front of remote receiver, or install a magnetic ring on receiver panel, or replace controller.
Case 7 Protection of Power Phase Sequence
Product Model：ASF-H41A5/A
Phenomena: timing indicator and running indicator blinked when we started up the air conditioner
Cause Analysis: according to fault code, we judged that outdoor unit was in protection situation and
forced compressor running. The air conditioner could function properly, and pressure switch and
power circuit were also in good condition; we presumed that problem was caused by sequence check
protection. We changed phase sequence and turned on the air conditioner, compressor suddenly run
reversely. All these proved that phase sequence detecting panel had some problems.
Solution: replace detecting panel of outdoor unit.
Experience Conclusion: service personnel shall have some knowledge of circuit operation philosophy,
and find out the problems according to fault code. We shall work under the principle of “from simple
to complicated way”, (for example, in this case, when we adjusted phase sequence, compressor run
reversely after we turned on the air conditioner again. So compressor wiring shall be changed, and
make compressor run properly. ) Our A series air conditioners adopt three-phase power, installation
personnel sometimes may fail to connect phase line and zero line correctly, in this case, compressor
also can’t be started up. We should pay attention to this when we fix the fault of air conditioner.
Case 8 FS and DS Control Panel Button Failure
Product Model：ASF-H18B4/DS
Phenomena: control panel buttons couldn’t function, but remote controller worked.
Cause Analysis: because remote controller can receive signal, main computer panel has no problem.
After check, we found that low frequent diode IN4007 was used on the display panel produced by
Changzhou Hongdu Co., but according to main program, this button shall be high frequent. Control
panel and main panel are not compatible, and main program can’t respond to the signal from buttons.
Incompatibility of control panel and main panel mainly happened in the air conditioners manufactured
by Changzhou Hongdu Electronic Product Co. Ltd before February 2004.
Solution: replace the said control panel with that produced by Changzhou Hongdu Electronic Product
Co. Ltd after February 2004 or products from other companies; we also can replace D1～D12 diode
on control panel with IN4148 high-frequent diode.
Experience Conclusion: besides failures in buttons of DS panel, temperature regulation button on
FS(Y) also may fail to work well. Spaces for buttons on display panel may be too narrow and buttons
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