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An Old Carrier HVAC System: Issues And Solutions


A problematic HVAC (Heating, Ventilation, and Air Conditioning) system can be a nuisance to homeowners, especially during extreme temperature conditions. In this article, we will discuss the issues encountered in an old Carrier HVAC system, how to troubleshoot it, and the importance of having a warranty and maintenance plan for your unit.

Troubleshooting An Old HVAC System

A homeowner recently experienced issues with their 21-year-old Carrier HVAC system. It was low on refrigerant, and no major leaks were detected except for a little bit at the schrader cores. The cores were replaced, and the system was charged up. However, the homeowner later reported that the system was not functioning at all. Here’s how the problem was approached and resolved.

Step 1: Check the Basics

The first step to troubleshoot an HVAC system is to check the basic components. It’s essential to ensure that contactors are pulled in and that there are no unusual noises coming from the unit. In this case, the contactor was, in fact, pulled in, indicating that power should be reaching the system.

Step 2: Check for Voltage

Next, it’s crucial to verify if the proper voltage is being supplied to the HVAC system. In this scenario, it appeared that only one leg of the voltage was present, indicating a potential issue with the supply of power to the unit.

Step 3: Look for the Cause

The homeowner was asked if there were any fuses in their house, but none were found. However, it was discovered that their Carrier system had a warranty.

Step 4: Inspect the Fuses

Upon further inspection, it was determined that the issue might be due to the fuses not making proper contact. To fix the problem, the fuses were adjusted, allowing the unit to function correctly.

The Importance of Warranty and Maintenance Plans

As the homeowner’s warranty was about to expire in a few months, they were concerned about the possibility of their unit needing replacement in the future. They were also unclear about their options to renew their warranty for such an old system. Here’s what you need to know in similar situations.

Warranty Renewal for Old HVAC Units

In most cases, a warranty company will be willing to renew a warranty for an old HVAC system, as long as it is in working condition. If the unit is functioning well, it is recommended to renew the warranty to avoid any unexpected expenses in the future. It’s also a good idea to discuss your warranty options with your warranty provider.

Maintenance Plans for HVAC Systems

In addition to having a warranty, it’s essential to have a regular maintenance plan for your HVAC system. Regular maintenance can help in detecting and resolving potential issues early on, preventing costly repairs or replacements down the line. It can also ensure that your unit operates at its best, providing optimal comfort and energy efficiency.


Dealing with an old Carrier HVAC system, or any old HVAC system for that matter, can be challenging. However, learning to troubleshoot basic issues, keeping your unit well-maintained, and having a good warranty plan in place can save you both time and money.

Always consult with a professional HVAC technician if you are unsure about how to handle a specific problem or if the issue persists. Having a reliable technician who can quickly address any concerns with your unit can ensure that it remains in good working condition for many years to come.

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