
AC Not Cooling? 9 Causes and What to Check Before You Call an Engineer
Is your AC blowing warm air or failing to cool rooms? Learn nine common reasons for AC issues and what to check before calling an engineer.
RightAir Solutions is a company that specialises in commercial air conditioning services.
An installer guarantee covers issues related to how the system was fitted, while a manufacturer warranty applies to faults in the equipment itself. Both are forms of protection, but they apply to different aspects of your HVAC system and come from different sources. For full coverage, both may be necessary.
An installer guarantee is issued by the company or contractor who carried out the installation. It typically covers problems caused by incorrect setup or poor workmanship. A manufacturer warranty, on the other hand, comes from the system’s producer and covers defects in the components or the equipment’s manufacturing.
To illustrate this, consider a situation where an air conditioning unit stops working. If the fault lies with a badly connected refrigerant line or a poorly sealed duct, this would fall under the installer guarantee. If the failure is due to a faulty control board or compressor, the manufacturer warranty would be responsible.
These two layers are designed to work in parallel. The installer guarantee ensures the system was installed properly, and the manufacturer warranty ensures the equipment performs as it should.
Installer guarantees exist to protect the client from issues caused by faults in the installation process. This includes areas where workmanship might fall short or where the system configuration does not match the manufacturer’s recommendations.
Common inclusions are:
Exclusions often include:
London’s housing stock adds further challenge. Converting ducted systems into Victorian conversions, or fitting condensers in tight shared spaces, demands considered design as much as clean execution. In these cases, a strong installer guarantee becomes less about covering mistakes and more about assuring peace of mind that the system has been fitted intelligently and with foresight.
Pro Tip: Always ask your installer for commissioning documents and save both digital and printed copies in a designated folder.
A manufacturer warranty covers mechanical or electrical faults within the equipment itself. This kind of warranty is important for long-term system durability and is usually provided automatically when equipment is purchased and installed correctly.
Typical items covered include:
However, coverage generally depends on meeting several conditions:
If, for example, a control board stops functioning nine months after installation and the servicing is up to date, the claim would be valid under the manufacturer warranty. But if servicing has never taken place, the warranty may be rejected, even if the fault stems from a factory defect.
Ensure your system is installed and covered properly from day one with a qualified review from our certified engineers.
Although installer guarantees and manufacturer warranties serve different purposes, they are designed to complement each other. In some situations, however, both might point to the other, leaving the client uncertain about who is responsible.
Consider a system that stops cooling. The installer arrives and confirms all fittings and pressures are correct. The fault lies in a component, meaning the manufacturer must be contacted. Alternatively, if a leak is traced to an incorrectly sealed joint, the installer is responsible.
Overlap areas sometimes include:
To reduce risk, it is helpful to:
Clarity upfront prevents blame from becoming the focus when something goes wrong.
Pro Tip: Make a calendar reminder to log every service visit with the engineer’s name and summary included.
Both installer guarantees and manufacturer warranties can be voided if the system is misused or altered in ways that compromise its performance or lifespan. Many of these actions are unintentional but still remove the safety net if something later fails.
Common causes of voided coverage include:
Remaining compliant is not complex. Use certified contractors, retain service records, and avoid unauthorised work. This small attention to process keeps coverage intact.
Good records are not just for admin. They are what allow both installer guarantees and manufacturer warranties to be honoured without friction. Maintenance also plays a direct role in detecting and resolving issues before they become serious problems.
Useful records to retain include:
Even a simple digital folder can centralise this information. When something does go wrong, these materials allow the right party to act quickly and decisively. They also show that you, as the client, have met your part of the agreement.
Regular maintenance supports warranty conditions but also long-term comfort, efficiency, and cost control.
Unsure if your HVAC system meets warranty conditions? We can review your documentation and maintenance history.
Selecting the right installer goes beyond technical capability. It includes their approach to project documentation, handover, post-installation support, and how well they communicate your obligations under both types of coverage.
Before agreeing to any installation, ask:
Installers working in high-value London homes, particularly those with integrated systems or constrained spaces, must be confident communicators as well as capable engineers.
Firms like RightAir Solutions tend to structure their service lifecycles clearly. System design, installation, maintenance, and documentation are seen as one continuum rather than isolated tasks. This mindset ensures a smoother client experience, fewer disputes, and systems that remain protected and high-performing for years.
Our team understands the unique needs of high-value London homes. Get answers tailored to your property.

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RightAir Solutions
At RightAir Solutions, we provide air conditioning services to domestic and business customers for heating and cooling units. We also supply and fit commercial AC and HVAC services with our insured, qualified and experienced London team of air con engineers.