How to Solve Faulty PCB and Expansion Valve?

How to Solve Faulty PCB and Expansion Valve? In an air conditioning unit, PCB or printed circuit board and an expansion valve play an important role in its proper working.

PCBs are usually designed according to the specifications of the unit whereas Expansion valves are usually installed at the inlet evaporator to convert the refrigerant into cold gas at low-pressure to regulate the flow of refrigerant through the air conditioning system.

So proper working of both of these parts is very important for the efficient working of the entire air conditioning unit.

But an error can occur in both PCB and expansion valves any time due to any reason. So it becomes necessary to solve faulty expansion valves and PCB to ensure proper working of the air conditioner.

Solving faulty PCBs

If you are solving faulty PCB for the first time then you must know some information about PCB as well as the role of electricity in this procedure.

Electricity is normally used to run several appliances and lights. In an electrical circuit, it flows from a source of current from a positive level to a negative level of voltage.

While developing a circuit board various types of parts are used to design and assemble a circuit board popularly known as a printed circuit board or PCB.

Earlier the process of making these circuit boards was very complicated as at some points a lot of detailed wiring was involved in them. These circuit boards were likely to damage very easily as their wiring was left exposed.

To make this process safe and more effective their design was modified as modern PCBs or printed circuit boards by following the standards of security.

In today’s printed circuit boards mainly four components are used including a substrate made of fiberglass, copper, solder mask, and silkscreen.

According to the technology used earlier, single layer PCBs were manufactured but now multi-layered PCBs are designed to enable them to adjust complicated circuits.

Though various types of parts with high-pitch are used in the latest PCBs but one cannot identify them easily on the board.

It makes the process of solving a problem and repairing the modern PCBs a bit more difficult than earlier.

Repairs can be performed easily on the circuit boards of the 1980s and 1990s by using some tools of automatic testing which cannot be used on the latest PCBs.

Solving faulty PCBs of the 1980s and 1990s

The techniques used for solving faulty older PCBs were used in many ways like:

• Identification of the issue
• Inspection of the soldered joints
• Inspection of the integrated circuits or ICs
• Fixing particular parts
• Microscopic inspection
• Consulting the manual of the software
• Functionality testing

While fixing some of the faults on the printed circuit boards, most of these tests proved to be ineffective. Still, they were easy to fix as compared to the latest PCBs as their process to analyze faults is very complicated.

Solving faulty expansion valves

The commonly used expansion valves in air conditioning units are the aftermarket products that are normally installed at the inlet of the evaporator of the AC.

The main function of this valve is to change liquid refrigerant into cold gas at low-pressure which can help in regulating the flow of refrigerant throughout the system of the air conditioning unit.

Expected problems in an expansion valve

Expansion valves usually malfunction as they have to work in improper conditions, are sensitive to temperature, under high pressures, and impurities circulate inside them.

Your air conditioner will not cool the air properly if its expansion valve is clogged or stuck open.

The compressor of your AC will get overheated due to increases in the pressure in the system due to the insufficient supply of refrigerant caused by clogged valves.

On the other hand, too much aircon refrigerant will pass into the compressor as well as through the entire system if the valve is stuck open.

There can be problems in the performance and functionality of your air conditioner if its expansion valve fails to perform properly.

It can damage other components also and can considerably increase your repair bill if not repaired as soon as possible.

Suggested solutions

You are recommended to perform an extended diagnosis of the system if the operation of expansion valve malfunctions.

The operating pressure of the system can be maintained by detecting the most common problem with the help of pressure gauges. However, you should replace the expansion valve of your aircon if it fails to work.

How to Solve Faulty PCB and Expansion Valve – Conclusion

Thus, problems in faulty PCB and the expansion valve of an AC can be resolved.