AUX air conditioner service manual
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when we’re repairing air conditioners and avoid replicated work.
Case 12 Transformer Failure
Product Model：ASF-H18A4/FS
Phenomena: air conditioner didn’t function after it was turned on
Cause Analysis: checked power supply, there’s 220V input power, so power supply circuit has no
problem. Checked power socket, resistance is infinite great, so fuse or transformer might burn out.
Opened and checked indoor panel, we found that fuse was in proper situation, but transformer broke
off.
Solution: replace transformer
Experience Conclusion: if air condition fails to respond when it is turned on, we should check power
circuit first of all to find out faults quickly and accurately.
Case 13 AC Contactor
Product Model：ASW-H24B4/A
Phenomena: failing to produce heat
Cause analysis: turned on air conditioner, and switched to heating function, outdoor fan didn’t run, and
four-way valve closed; we checked and found power supply of AC contactor was regular; pushed on
AC contactor forcibly, compressor functioned; when we checked and found loop of AC contactor
broke off.
Solution: replace AC contactor.
Experience Conclusion: air conditioner fails to produce heat, if power supply of indoor unit is regular,
outdoor fan and four-way valve function well, compressor still fails to work, we shall check whether
contactor pulls on, loop resistance value is normal, and then check if there’s any problem in
compressor. Main problems in AC contactor may include loop burning out, contacting points loosing,
contaminated and burning out and etc.
Case 14 Power supply circuit failure
Product Model：ASW-H12A4/H
Phenomena: cooling failure
Cause Analysis: we started up the air conditioner, indoor worked well, but outdoor unit couldn’t start
up normally and produced abnormal sound; its voltage decreased from 230v to 138v, so we presumed
that there’s problem in power supply circuit. We checked power receptacle and found that decoration
worker had used grounding line as zero line.
Solution: connect grounding line and zero line correctly
Experience Conclusion: connect N end to zero line, and don’t replace zero line with grounding line, or
air switch will trip. If new air conditioner has problems, we should check power circuit firstly;
sometimes, power line is too thin, and startup current of air conditioner is quit large and produces large
voltage drop which will cause difficulties in startup. Besides electrical power problem, air switch may
cause startup trip.
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