AUX air conditioner service manual
190
when indoor temperature sensor and heat exchanger exceed 25 Celsius degree, fan produces gentle
wind; when temperature exceeds 38 Celsius Degree, fan produces wind of set velocity. We checked
and found that wind velocity is very low, and wind temperature is quite high, so fan works well. So we
presumed that the sensor failed to reflect the correct temperature, and then indoor fan can’t run at set
velocity, so it must be replaced.
Problems in temperature sensor constitute a large percentage of all air conditioner faults. First of all,
we should know its function: detecting indoor temperature, when indoor temperature reaches set value,
it will control the function of indoor and outdoor units: under cooling situation, outdoor unit stops
running, while indoor unit continue to work; under heating situation, indoor unit will stop after surplus
heat has exhausted by fan.
3、Outdoor anti-frost temperature sensor: Detecting outdoor condenser coil
When outdoor loop temperature drops blow －6 Celsius Degree and maintains for 2 minutes, indoor
unit will be in the anti-frost situation; When resistance of outdoor coil sensor is relatively large, indoor
unit can’t work normally.
Case 5 Air conditioner can’t refrigerate the room (communication fault)
Product Model：ASW-H24B4/A
Phenomena: function light of indoor unit blinks (other lights extinguish), indoor and outdoor units fail
to work.
Reason Analysis: we turned on the air conditioner, and it worked well. After about 30 minutes, indoor
and outdoor units stopped to work, function light blinked, and we pushed buttons, air conditioner
didn’t respond; we pulled the socket from the power receptacle, and then tried to start up the air
condition once again; the unit worked for 30 minutes and then the same phenomena occurred again. So
we presumed that there’s no problem in unit, and probably outside communication interfered the
proper function of air conditioner. Fault code provided by our company also indicated outside
interference. We checked communication line between outdoor and indoor units and didn’t find any
problem, so we confirmed that our presumption was right.
Solution: parallel connect a 103 ceramic chip capacitor to signal line of computer panel, or replace
anti-interference C3Y computer panel.
Experience conclusion: pay attention to the indication panel, and find out cause of faults. If outdoor
temperature sensor has problem or indoor and outdoor signal line disconnect, time indicator of non
digital indication panel will blink 1 time/second, and E2 code will be displayed on the digital
indication panel, temperature light of three-phase A series will blink and other indication lights will
extinguish.
Case 6 outside Communication Interference
Product Model: ASW-H12A4/HSA
Phenomena: close down irregularly, and produce continuous buzz sound.
Cause analysis: we checked remote controller, emergence unit and all sensors and found that they
functioned well. The client bought two air conditioners of same model; one functioned well, but the
other failed. We suspected that there’s some interference source, and we found that there was a
electronic rectifying energy-saving lamp in the room where air condition at fault was installed. When
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