Weak current College】 【air conditioning not all refrigeration.

<br> <br> 1. fault code contains the contents of the fault <br> For the meaning of the code does not know that it doesn't matter, but for the universality of the code contains fault content must master, the following .list the air conditioner fault code meaning, simply said, meaning no matter what your code. <br> 1. sensor open circuit <br> Sensor open circuit was due to a lead line, plug-ins is bad, socket solder, short- .circuit resistance due to smaller than 200 Ω, circuit board with electric leakage or symbol leakage, etc. <br> High pressure and low pressure protection; <br> Four-way valve switching fault protection; <br> Three-phase phase sequence and .phase protection. <br> Overvoltage and less voltage, normal voltage range from 10% (200-240V). <br> 4. run the test parameters <br> Refrigeration thermal turn coil temperature is too high, cold protection; <br> .Heating indoor thermal turn coil temperature too low, thermal protection; <br> Compressor thermal overload switch actions; <br> Outdoor check flow protection (including check flow coil circuit, short circuit, the wire did not go through, etc.); < .br> Detection of fan speed circuit damage, the electrical fault (inner fan, fan stalled, not running protect); <br> Indoor and outdoor communication failures, failure of communication between indoor Board; <br> Of course not every air conditioner has .shown above failure, but when the air conditioning failure, we should be aware that there may be many of the factors above, to the benefit of our troubleshooting. <br> II. analysis and troubleshooting and repair <br> The failure of so many .of the displaying code, do not know the meaning of the case, is it not the hands of the following? according to repair experience and failure characteristics and can be quickly solved. <br> 1. high failure rate <br> According to the .air conditioning maintenance summary, found that the following is the main reason air conditioning failure, in the actual repair process, the most high failure rate. <br> (1) indoor heat exchanger coil temperature sensor failure rate of most high, even if not .bad, it detects the failure rate is relatively high. So if you think might sensor, may wish to examine and substitution. <br> (2) lack of fluoride is the common faults, in air conditioning working time protection, first of all you .should check the cooling effect is good, the bad, then be sure to make air conditioning the three pressure measurements, refrigeration for balance pressure and low pressure measurements, heating for balance pressure and high pressure measurement. <br> (3) the power supply .voltage is also very prominent, especially peak. For three-phase AC cannot start first check object is the phase sequence. <br> Air conditioner power checks focused on contact (air conditioning and total power switch) is spark erosion, poor contact, whether .total power switch internal resistance, contact good meets current capacity, the total power cord is too long, the voltage is lower than 200V. <br> Zero line and ground wire is attached, three-phase by phase and zero line is connected and concrete ., etc. <br> (4) high pressure protection, especially in the summer cooling when the outdoor heat. Compressor overload protection, higher temperature in summer and peak common. <br> (5) remote control receiver and display boards circuit is multiple .failures, the voltage measurement and substitution for the optimal choice. <br> (6) for the environment in poor areas. To connect, and outside the main check all cables for indoor gnawed off, this is a more frequent failures, circuit board and .button is damp. <br> (7) there are lengthened and outside machines pipes and cable joints is failure of multiple points, the wire connector is welded with a waterproof insulation blankets parcels partially installed, simply twist together with common blanket a package. < .br> (8) air conditioning of the connector is bad and is also one of the causes of malfunctions. <br> 2. the judgment of fault protection time <br> According to air protection time for fault analysis is also a good way of .protecting basic air conditioning can be divided into power cannot start protection startup protection within a short time, after 10-15 minutes, four indefinite time protection, etc. <br> (1) power not boot protection, but also the power even if they .don't start will also be protected. This situation is mainly composed of sensor, short circuit, open circuit, power supply, CPU peripheral circuit abnormalities, communication failures, failures etc. Circuit Board <br> (2) started a short time protection .mainly Interior and exterior fan rotation exception or do not go, Hall speed component damage, check flow coil circuit failure, etc., so that the CPU will not detect normal voltage signal. Compressor leakage, stalling, winding short-circuit, short to start .. <br> (3) start after 10-15 minutes, the main is to check whether the normal refrigeration system, cooling effect properly and that it lacks the fluoride, or indoor heat exchanger coil temperature sensor is metamorphic deviates from the normal resistance. .<br> (4) the protection of irregular mainly refrigeration cooling, heating heat, pressure, current, the compressor is in low voltage power cables run, air conditioning, outdoor heat contact problems, frequency conversion module thermal flow, etc. <br> .3. troubleshoot circuit board and external reasons <br> Familiar with circuit structure, the first distinguish between inside and outside the circuit of control panels, external detection, external control, etc., to distinguish fault is internal or external - determine circuit control failures .or refrigeration system failure - judgment of indoor or outdoor. <br> (1) analysis of the circuit. Analysis out and circuit board attached to each thread or plug, find used to detect air conditioning performance of the external lines, check these line exists .obvious and short-circuit. <br> (2) judgment of the Board and external fault. Circuit board peripheral line basic properly, can be broadly judgment circuit board for failures. Available through voltage testing and functionality testing fails check. <br> Like .to be able to remote control receives a beep, internal fan properly, heating operation four-way valve with fundamental working sound can judge the dashboard properly. <b> </ b> R> powered remote control does not receive the exception, not the .Beep action itself, the work program, to determine the PCB disorder itself is bad, or + 12V and + 5V power supply, public power circuit with circuit breakers, etc. <br> I do not know the meaning of code in a spirit of .simple economic difficult after propagation, a first-come, first-in General after the check, the key point of pressure, voltage, current, and resistance measurements, to achieve rapid troubleshooting purposes. <br> (1) total General check: < .br> Observation on the protection and power-on hours of troubleshooting. <br> Remote control can work, receiving head three voltage is normal. <br> Interior and exterior fan is running. <br> Protection before the sign. <br> .The sensor has no obvious open circuit, short circuit. <br> Indoor unit is dirty filters blocking, whether cooling-performing outdoor unit, poor ventilation. <br> User power check including phase sequence, voltage, power, wire diameter, contacts, .etc. <br> 220V voltage and current measurement. <br> Outdoor unit four-way valve can heating action, the compressor and the fan, if one does not work. <br> Loosen external machine wiring cover measurement voltage 220V, communications, .the next section is bad. <br> Remove the outer machine large cover check compressor capacitor, the fan capacitor. <br> Inverter air conditioner would also measure the voltage, external machine PN inverter template output voltage, etc. <br> (2 .) regular checking of circuit board: <br> Fuses, Varistors is burned. <br> + 12V, + 5V not normal filter capacitors, transformers, coils of on / off, load and no-load voltage, CPU power, the driver IC .and transistor voltage. <br> Reset the CPU voltage, the terminals are virtual welding, welding, 4M Crystal substitution. <br> Remote control reception, display circuit measurement and substitution. <br> Each relay in particular whether the power relay terminals, .all plugs solder is bad. <br> CPU input signal and output signal voltage-driven process measurement. <br> Circuit boards are negative for flooding, corrosion, dirt, check whether the coils of wire through the skeleton, the thread has no loose .and falling off. <br> (3) a regular check of the refrigeration system: <br> Refrigeration system balance pressure, low-voltage or high pressure measurement. <br> Current measurement, observation of the gas and liquid valve of dew condensation ., two valve opening. Check out hole tube bending, whether to lengthen the line between inside and outside and conductors. <br> (1) if there is a three-phase control must first phase sequence. <br> (2) plug in .the power and power no song or direction, display, or song of exception, be sure to check the power supply. Including user power supply, power supply, etc, have the computer's power supply is provided from outside to inside, outside a transformer and .fuse. <br> (3) check the CPU work conditions. CPU working conditions including the + 5V, reset (RC-4.8V, integrated 3V), substitution lens, peripheral circuits with no leakage or short circuit. <br> (4 .) plugged in has no sounds, remote control, remote control or the song received header failed. <br> (5) there are plugged in, remote control, a song for several seconds, check the sensor appears open circuit, short circuit, pressure .switch, temperature switch, circuit breaker. <br> 6. auxiliary method checks <br> (1) the use of fault display priority characteristics reasoning fault component <br> Air conditioning failure detection and display are a priority, the repair process may use .this feature to exclude non-faulty parts, analysis of the failed site. For example, a single "beautiful" cupboard, E3 show, the individually swappable three sensors, the display changes when drawing room pipe temperature sensor, the letters unchanged, judge their .damage, open panels are the cause. <br> (2) using the debug function sensor fault <br> Debugging features are automatic and forced cooling. Take advantage of automatic function can judge the Interior ring temperature sensor malfunction, the use of forced cooling .can determine whether a sensor fault, because only the forced cooling conditions, temperature controlled compressors other temperature has no effect. <br> (3) Cabinet machine Panel button or hang-up button to ensure that no leakage. <br> Air conditioning of .buttons work in humid environment or use wear, will cause the button has the adhesion or leakage, causing CPU protection, problems can use soldering iron ironing terminals or welding machine for under and try again. <br> In sum, the overhaul process we need .to target specific symptoms are reasonable analysis, and then decide what means check what parts, instead of saying to the above said one by one in order to check <br> <br> <br> <br> <br>.