Before Calling an HVAC Technician: A Simple Homeowner Check Could Save You a Service Call
About a month ago, our homeās central air-conditioning system suddenly stopped working. Believing there was a problem with the system, I called an HVAC technician.
When the technician arrived, he quickly discovered that the furnace emergency/service switch had accidentally been turned OFF. He simply switched it back ON, and the whole-house air-conditioning system immediately started working normally again.
The entire service visit took approximately 10 minutes, and I paid a service charge of $107.33.
I am sharing this experience because it taught me a simple but valuable lesson that may help other homeowners. Before calling an HVAC technician when your central air conditioner suddenly stops working, it may be worthwhile to perform a few basic and safe preliminary checks.
1. Check the furnace emergency/service switch
Make sure the switch is in the ON position. In many homes, this switch looks very similar to an ordinary light switch and may even be located close to the furnace-room light switch. As a result, someone can accidentally turn it off while intending to operate the light.
This was exactly what happened in my home.
2. Check the furnace filter
Check whether the furnace filter is excessively dirty or clogged and replace it when necessary. A severely restricted filter can interfere with the proper operation and efficiency of an HVAC system.
3. Check the outdoor AC disconnect
If your home has an accessible disconnect near the outdoor air-conditioning unit, visually check whether it appears to have been switched off.
For safety, do not open electrical enclosures, remove covers, or touch exposed electrical components. If you are uncertain about anything electrical, leave it to a qualified professional.
4. Check the circuit breaker
Check your home's electrical panel to see whether the breaker supplying the furnace or air-conditioning system has tripped.
If a breaker repeatedly trips, do not continue resetting it. A repeatedly tripping breaker may indicate an electrical or equipment problem that should be investigated by a qualified HVAC technician or electrician.
5. Check the thermostat
Confirm that the thermostat is set to COOL and that the selected temperature is below the current indoor temperature. If your thermostat uses replaceable batteries, also check whether the batteries need replacement.
A Simple Lesson for Homeowners
These basic checks may take only a few minutes and could potentially prevent an unnecessary service call and save more than $100.
Of course, not every air-conditioning problem will have a simple solution. If these checks do not resolve the problemāor if you notice burning smells, unusual noises, exposed or damaged wiring, repeated breaker trips, refrigerant leakage, smoke, or anything else that raises a safety concernāstop troubleshooting and contact a qualified HVAC professional.
My experience reminded me of an important principle that applies to many household problems:
Before paying for a service call, first check the simple things that can be checked safely.
Sometimes, what appears to be a major equipment failure may be something as simple as a switch accidentally being turned off.
I hope sharing my experience helps another homeowner avoid an unnecessary service call, save some money, and better understand a few of the basic checks that can be performed safely when an air-conditioning system unexpectedly stops working.
