If you set the temperature at the lowest temperature, then you feel the AC does not go cold, it could be the AC compressor is often dead alive. This is because the thermistor is sensitive to cold temperatures, so it is too fast to decide the current to the outdoor unit. So the room has not got cold, the machine is dead first. In the meantime, you may want to visit http://www.airconservicingsingapore.com/ to know the excellent AC repair service near you.
But you should note, the death it must be with the fan if the only it’s compressor die it can be because the ampere compressor is high, or the function of the capacitor is not optimal.
AC cannot be turned on using remote
Not all air conditioners experience this, but there are some brands if there is a problem with the thermistor then it cannot be switched on using the remote control. So it should be checked directly to be more certain of the problem. At least this can also be considered a technician in doing the checking.
There was a sound like a ringtone of a mobile phone.
Usually, this happens on the Samsung AC brand, if your air conditioner sounds when you try to turn on, it is definitely damaged in its thermistor. Therefore, immediately do a new there replacement, which of course must be with the same type and socket model.