As soon as the fan of the air conditioner turns, the hum will ring for a while, stop for a while, and then ring for a while. The internal machine is running normally, but it doesn't cool.
If this is the case in cooling mode, it is possible that:
1. You can directly judge that the voltage is low and check whether the mains voltage is normal.
2. If the power supply voltage problem is eliminated, it may be that the starting capacitor capacity is too small (not completely broken), and a capacitor can be replaced.
3. If there is no problem with the capacitor, it means that the compressor is short of refrigerant and seriously short of refrigerant. It is recommended to add refrigerant.
Maintenance method of outdoor unit of air conditioner:
1. The outdoor unit of the air conditioner is installed in an environment close to the oil fume emission (such as the place near the kitchen, the stove room of the hotel, the place where the oil fume emission concentration is high, and the place where the oil fume pollution of factories and mines exceeds the standard), which causes the heat exchanger of the indoor and outdoor unit to absorb a large amount of high-concentration oil fume and dust and attach to the heat exchanger, seriously affecting the adjustment effect of the cooling and heating temperature of the air conditioner, making the air conditioner unable to work normally and causing the compressor to be overheated.
2. The surrounding environment where the outdoor unit of air conditioner is installed or used. Don't get close to flammable gas, corrosive gas, chemical gas and other harmful gases and places that are easy to leak, so as to avoid fire caused by gas leakage. Do not use in flammable, explosive and corrosive gas environment. Causing damage to the air conditioner.
3. For air conditioners with long service life, pay attention to the running noise of outdoor fans, and add lubricating oil when necessary, because the running environment of fans is harsh and the lubricating oil of bearings is easy to dry out.
4. The outdoor unit should be kept clean when the air conditioner is used, especially the heat exchanger (radiator). If it is too dirty, it will affect work efficiency. It's best to wash it with tap water pipe or scrub it up and down with a long brush. Please refer to How to Clean Air Conditioner for specific cleaning steps. You would never think that the air conditioner needs cleaning.
5. The outdoor unit is exposed to the operating valve. When the air conditioner is working, the refrigerant temperature in the pipeline is low, which makes the air moisture condense and produces condensed water, which is a normal phenomenon.
6. Use a cloth cover to prevent dust when the air conditioner is stopped, and clean the dust when it is hot, because the dust on the condenser fin will affect the heat dissipation, increase the condensation pressure and reduce the efficiency.
The outdoor unit of the air conditioner is not afraid of wind, water and rain, but it also needs heat dissipation, so it should be installed in a cool place, and the cleaning of the outdoor unit is more troublesome. If air conditioning is installed uniformly in the community, the property can be cleaned regularly by a professional air conditioning cleaning agency.