If your air conditioning unit is running but not cooling as it should, there could be a number of underlying issues. While some are simple to fix, others may need expert attention. Identifying the problem early can save you time, money, and the risk of a complete system breakdown.
There are several reasons why your air conditioning may not be performing as well as it should. One of the most common issues you can check yourself is dirty filters. When filters become clogged with dust and bacteria, they restrict airflow, forcing your system to work harder without improving cooling performance.
Removing the filters and gently brushing or cleaning them can often resolve the issue quickly. To keep your air conditioning running efficiently, filters should be cleaned or replaced every 1–3 months, depending on your environment and usage.
Regular servicing is also essential, as prevention is always better than cure. Rather than waiting for performance issues or a complete breakdown, staying on top of routine maintenance helps ensure long-term comfort, efficiency, and reliability from your system.
One of the most common call-outs we receive is due to incorrect air conditioning remote control settings, rather than a fault with the unit itself. While it’s always good news when there’s nothing wrong with the system, these issues can often be avoided with a quick check of the controls.
After every installation, we provide a full walk-through of the remote control and how to operate your system. However, we understand that air conditioning can feel overwhelming for new users, and it’s not always easy to remember every setting.
Before booking a call-out, we strongly recommend double-checking that your remote control is set to the correct mode and temperature for the function you want.
For optimal performance, it’s recommended to use dedicated modes rather than relying on Auto:
By setting a realistic target temperature, your air conditioning unit’s inverter technology can operate as intended. This allows the compressor to:
This process not only improves comfort but also reduces energy consumption and helps lower electricity bills.
Once the room reaches your set temperature, the system will enter a standby or low-output mode. At this point, it may seem like the unit has stopped blowing cold or warm air, this is completely normal. The system will automatically resume cooling or heating when the room temperature changes.
Another common reason your air conditioning system may not be cooling properly is refrigerant loss. Refrigerant is the substance your air conditioner uses to absorb heat from inside your home and release it outdoors. Without the correct amount, your system simply cannot cool effectively.
Unlike filters or remote settings, refrigerant does not get “used up.” If levels are low, it usually indicates there is a leak somewhere in the system, which will need to be inspected and repaired by a qualified technician.
Refrigerant loss can significantly impact your air conditioning system’s performance. Common signs include:
If you notice any of these issues, it’s important to have your system inspected by a qualified engineer as soon as possible. Early diagnosis and repair can prevent further damage and restore efficient cooling performance.
Refrigerant handling must always be carried out by a licensed air conditioning technician. At Drayton Air Conditioning, we are F-Gas certified and have over five years of hands-on experience working with modern air conditioning systems. If your air conditioning is not cooling and refrigerant loss is suspected, continuing to operate the system can lead to further damage, reduced efficiency, and costly repairs. Prompt inspection and professional repair are essential to protect your system and restore proper cooling performance.
Many common air conditioning problems such as incorrect settings, reduced cooling performance, or refrigerant issues can be prevented with regular maintenance and servicing. At Drayton Air Conditioning, we strongly recommend scheduling regular maintenance and servicing to keep your system performing at its best all year round. Learn more about our professional air conditioning maintenance and servicing in Shropshire by visiting our dedicated page
There isn’t a fixed schedule for checking air conditioning filters. How often you should inspect them depends mainly on the environment and how frequently the AC unit is used.
General guidance:
Every 1 month if the system is used heavily, you have pets, allergies, or the property is in a dusty environment
Every 2–3 months for average use in a clean environment
Before peak seasons (spring and summer), even if the filters were checked recently
Minor issues, like replacing & cleaning filters , can be done safely at home. However, complex problems such as refrigerant leaks, electrical faults, compressor issues, or unusual noises should be handled by a licensed F-Gas engineer.
Attempting major repairs yourself can be dangerous and may void warranties. Regular maintenance, like filter changes and keeping outdoor units clear of debris, is the safest way to keep your AC running efficiently.
No. Simply topping up refrigerant is not a permanent fix. If your air conditioning has a leak, a licensed engineer must:
