Problems Caused By Bad Expansion Valve

There are a lot of components and pieces that make up a central air conditioner that the average homeowner does not even think about. The thermal expansion valve is a component of an air conditioner that you should be familiar with if you own one. The sole purpose of the valve is to control the flow of refrigerant enters an air conditioner and the amount of superheat that escapes. You can easily resolve these problems by contacting

Although seemingly insignificant, the component serves a crucial purpose in a central air conditioner. Find out why repairing the thermal expansion valve is crucial to the continued operation of your air conditioner and what frequent issues you could encounter. For more vital information, visit

1.   Clogged Filter:

Cleaning is a crucial part of maintaining any type of air conditioning or heating system. The small size of a thermal expansion valves makes it vulnerable to debris, which can lead to inefficient cooling. If this is not fixe, the refrigerant won’t be able to escape as freely, which could cause serious issues. Many expansion valves components feature a strainer that may be remove to rectify a clogge valve without removing the entire valve.

The clogging problems should be resolve after the strainer is remove and cleane. If the expansion valve strainer has to be replace or if the valve itself is constantly blocke, an HVAC specialist like can resolve it. A HVAC specialist can fix your system in no time, and they could even give you advice on how to avoid future blockages. Dusting and maintaining a clutter-free zone around the air conditioner are both good practises for keeping the valve clean.

2.   Detecting a Faulty Light Bulb:

The detecting bulb is an integral part for the thermal expansion valve. The temperature of the refrigerant leaving the valve can be read by the bulb. A faulty detecting bulb could cause the valve to open too widely, too narrowly, or nothing at all. This component could fail for a number of different reasons. It’s possible that the bulb itself is broken. It is possible that the sensor bulb will not accurately read refrigerant temperatures if it is install vertically rather than horizontally.

The detecting bulb needs to be examine thoroughly to find out what went wrong. In many cases, changing the detecting bulb will restore proper valve operation. There are a lot of potential issues with the detecting bulb, so you shouldn’t try to fix it on your own. The detecting bulb in your air conditioner should be checke once a year at the very least. The examination will cut down on the frequency with which emergency calls are made due to AC failure.

Excessive Heat:

The aforementioned issues or more widespread failures inside the valve, might lead to system-wide overheating. When the valve becomes too hot, it risks releasing too much superheat all at once, which can have a negative impact on its efficiency. Expansion valve discolouration is an obvious symptom of overheating. If the expansion valve has changed colour because of overheating, an HVAC specialist will notice right away.

Once discolouration has set in, it cannot be undone easily. A technician will inspect the overheated component and likely replace the entire expansion valve unit. The additional measures will prevent the issue from occurring again. Discolorations will be more noticeable in well-lit areas. A headlight or torch will illuminate the thermal expansion valve and bring out its vibrant colours even if the surrounding area is dim.

A Drop in Cooling Efficiency:

If your air conditioner is not producing cold air, it could be the result of a malfunctioning thermostatic expansion valve, but there are other potential causes as well, such as undersized units, unclean filters, blocked condenser coils, a broken blower fan, and so on. Check the thermal expansion valve if you find warm places in the house or if the air conditioner is not producing the proper temperature.

Air Conditioner Making Strange Sounds:

Is your air conditioner make strange noises when running? Loud AC noises may indicate a faulty compressor and loose parts. If your TEV fails, your AC may make clanging, pounding, or screaming noises that worsen with time.