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Hi, I'm Dima, I'm from Russia (excuse me my English)
We have an air conditioner 48000Btu/h. When we switch on 3 leds are turning on at outdoor unit. Than after about 3 minutes it goes cooling for about 30 seconds and than compressor stop working and Led3 turning off. In 10 minutes everithing repeat.
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Air Conditioners are broken down into two electrical systems, though they work together1. Low voltage control unit 24-28 volt control unit like thermostat and other switches and relays( also feeds compressor contactor,reversing valve, and defrost board on heat pumps)on the outdoor condensing unit .When there is no power to the thermostat,it cannot turn on the indoor fan or any other load (indoor or outdoor). In this case, first confirm there is power available (closed breaker,closed disconnect) If you have power the fan on manual switch on the thermostat should be able to turn on the indoor fan.If it doesn't, then your control voltage is most likely lost. check the transformer and 3 amp fuse in the air handler .2.The high voltage components are your compressor and your fans, both indoors and outdoors.High voltage 240 volt loads are controlled by the 24-28 volt control voltage.3. Remember, a thermostat is just a big on/off switch.4.Be careful and always play it safe when working around energized circuits5. Leave it to the pros, especially if you're inexperienced or nervous about electricity
The outdoor unit has to be powered from the indoor unit on which the main processor board is present.Disconnect power and check the main PCB. It is possible that the main unit has shut off as there is connection fault or a fault in the compressor unit. So the outdoor unit power supply from the indoor unit must be checked with a multimeter for voltage on switch on. If not there are errors in the main processor board.
Most of the time with those units... you have a refrigerant leak...
They also usually have led's that blink to give you a code as to what is wrong... the blinking can be on the indoor unit or on the circuit board of the outdoor unit...
Here is a tip about troubleshooting your air conditioner...
There are many things that can cause your air conditioner not to cool...
This sounds like load leakage current through the timing device. The timers shown in the picture use electronic control components and do not turn the power all the way off like a light switch, especially if not grounded properly. This can cause issues with LED lights since they are basically diodes and can "leak" power in reverse bias.
Most of these timers have a three-prong plug - they should be plugged into a grounded, three prong outlet so the residual current is shunted off during the "off" cycle.
In plain English, the circuit should be grounded.
You could try another type of timer, like one meant for air conditioners or lamps - they use a basic on/off switch. However, these devices may not be rated for outdoor use so be careful.
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