This guide will explain how to troubleshoot split air conditioner controls, which are non-inverter controls.

Taking note that the printed circuit board's power supply is LIVE, you need good electrical knowledge to do this. When troubleshooting the control board, disconnect the power supply and isolate it. If you are uncertain, ask a qualified technician to look it over.

A Split Ac not working is commonly known as ductless split or mini split where there is an outdoor unit and an indoor unit. An outdoor unit consists of a compressor, a fan, and a condenser that transfer heat from the indoor environment to the outdoors. 

It is composed of an evaporator, an expansion valve, and a fan. The refrigerant is flowed between the indoor unit and the outdoor unit through copper pipes.

Inverter-based compressors can adjust their speed according to the load, while non-inverter split air conditioners have an ON/OFF compressor.

Here is a breakdown of a typical controller to help you understand it better.

Air conditioners that don't cool on hot summer days are the last thing you want. There are several reasons for this, some of which are technical, some of which are not.

The most common reasons for Split Ac not working are:

Clogged air filter

You should clean or replace the air filter if the air conditioner does not cool. A clogged air filter prevents the air from flowing properly, so the air conditioner will not be able to cool properly.

Dirty coils

It is possible that the condenser coils in an air conditioner are dirty and loaded with debris if the air conditioner is not cold enough. A condenser coil is like a radiator that dissipates heat (which is removed from the air). For the air conditioner to dissipate heat outside, it must be clean. As the coils become dirtier, the air conditioner becomes less efficient, so it has to work harder to cool the room. If the coils are too dirty, the unit will never cool enough and cannot cool it.

Can't my split AC cool even though it's running?

The condenser coil can be blocked or clogged if the fan is not pulling air into the outdoor unit, which pulls heat energy from your home.

What is the reason that my air conditioner is on but not cooling?

Check the outside unit and take care to remove any debris or weeds blocking air circulation. If your air conditioner turns on and your thermostat is set properly, but it is still not cooling, you may have a dirty or blocked air condenser.

What is the best way to check the gas level in my air conditioner?

It is also common to ask about how to check the gas level of an air conditioner at home. The simplest way to do that is to connect a gauge set to the system and check the pressure against the ambient temperature.