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No Heat: Diagnosing the Problem & Taking Action

heating repair San Juan, TX

It’s never fun when things don’t work as they should during such an uncomfortable time. This is true when it’s freezing winter and your heater has gone out on the coldest point. So what do you do?

If you’re stuck in the cold and don’t know where to start fixing things, here’s a quick guide for you. Keep reading to learn more!

Common Causes of a Faulty Heating System

In most cases, a lack of heat is due to a problem with your unit. Here are some of the most common furnace issues that may need professional heating repair San Juan TX:

Dirty Air Filter

Furnace stopped working? You may start checking the air filter.

A dirty air filter restricts airflow and puts unnecessary strain on your furnace, leading to decreased efficiency and eventually complete breakdown. The good news is that this problem is easy to fix—just replace your air filter! Most air filters should be replaced every three months.

We can’t stress enough how important it is to keep your filters at their best. Not only clean filters help your heating system run more efficiently, but it also helps improve your air quality.

Depending on the type of filter you have, you may need to change it every few months. Check your manufacturer’s recommendations to see how often you should be changing your filter.

Thermostat Issues

Is your thermostat working at all? Be sure it does! With a faulty thermostat, your heater may not work as expected.

So what is it that you need to check in your thermostat? First, is the settings. If your thermostat is set to “off” or “cool,” then obviously your furnace will not turn on! Set your thermostat to “heat” and make sure that the temperature is above the room’s current temperature.

Similarly, if the batteries in your thermostat are dead, then it will not be able to communicate properly with your furnace. To fix this problem, just check your thermostat settings and replace the batteries if necessary.

Pilot Light Out

In order for your furnace to work properly, the pilot light must be lit. If the pilot light has gone out, then you will need to relight it. This can usually be done by following the instructions in your furnace’s owner’s manual.

If you’re a homeowner, chances are you’ve had to deal with a finicky pilot light at some point. Most of us know just enough about our home’s heating systems to be dangerous, so it’s no wonder that questions about pilot lights abound.

What is a pilot light?

A pilot light is a small flame that burns continuously and is used to ignite the main burner in a gas furnace or water heater. The main burner is what provides heat to your home or hot waterto your shower, so you can see why it’s important to keep that pilot light lit!

Why do pilot lights go out?

There are a few reasons why your pilot light might go out. First, if the area around the pilot light is dirty, the dirt can build up and smother the flame. Second, if the gas valve isn’t fully open, the flow of gas to the pilot light can be restricted, causing the flame to go out. Finally, if there’s a draft in the area (perhaps from an open window), that can also cause the pilot light to go out.

How do I relight my pilot light?

Relighting it is relatively simple. First, locate your furnace or water heater and find the knob that controls the gas flow to the unit. It’s usually located near the bottom of the unit. Next, turn off the power to the unit by flipping the switch next to the knob (this may look like a traditional light switch).

Once power is off, turn the knob labeled “Gas” until you hear gas flowing through the unit. Next, locate your pilot light; it should be on the front of your unit near where the gas enters. Use a long lighter or matches to reignite the flame; hold down the button or lever next to the pilot light while you do this.

If successful, you’ll see a small blue flame appear. Release button or lever and you’re done! If ever you can’t find your owner’s manual or you are having trouble relighting the pilot light, then you can call a heating repair San Juan TX professional to help you out.

Furnace Switch Flipped

Oftentimes, when homeowners experience a furnaces issue, they forget to check this simple switch! To fix this problem, just locate the switch (usually close to where the power cord enters the unit) and turn it on.

If your furnace still isn’t working, then you may have a more serious problem on your hands. In this case, it’s best to call a professional for help. A qualified heating repair San Juan TX technician will be able to quickly diagnose and fix the issue, so you can soon enjoy warm air in your home again.

Your Furnace is Blocked

Your heater may not be producing heat simply because it’s blocked!

First, identify the source of the obstruction. Is it a clogged air filter? If so, simply replace the filter with a new one. If the problem persists, it could be a blockage in the ductwork. In this case, you’ll need to call a heating repair San Juan TX professional to have the ductwork cleaned or repaired.

Once you’ve identified the source of the obstruction, take steps to clear it so that air can flow freely through the furnace again. With the obstruction cleared, your furnace should be able to heat your home effectively once again.

For your furnace to work efficiently throughout the cold months, it needs one thing: MAINTENANCE!

Furnace maintenance is essential in order to keep your furnace running properly. A well-maintained furnace will not only function better but will also last longer than one that isn’t maintained. You can do furnace maintenance, or you can hire a professional to do it for you.

But for now, here’s some maintenance tips to help you!

5 Maintenance Tips on How to Keep Your Furnace Working Efficiently

Check Your Furnace’s Filter Monthly

Your air filters needs to be replaced regularly for clean indoor air and proper airflow. A dirty filter will hamper airflow and cause your furnace to work harder than necessary, which can lead to premature wear and tear. Plus, it can cause your furnace to overheat, which could lead to a fire hazard.

To be safe, check your filter monthly and replace it as soon as it starts to look dirty.

Keep Your Vents and Registers Unobstructed

Anything that blocks these openings can limit the air that flows to your system and cause your furnace to overwork itself. Not only will this reduce its efficiency, but it can also shorten its lifespan. So make sure all of your vents and registers are clear and unobstructed!

Maintain Good Indoor Air Quality

This simply means taking steps to improve ventilation and reduce dust, pollen, and other irritants in the air. Some simple ways to do this include using an air purifier, vacuuming regularly, and dusting often.

By improving your indoor air quality, you’ll not only make your home more comfortable for everyone, but you’ll also reduce the strain on your furnace.

Schedule Annual Furnace Maintenance

One of the best ways to keep your furnace running efficiently is to schedule annual maintenance with a qualified technician.

During a tune-up, they will clean the unit, inspect all of its parts for wear and tear, calibrate the thermostat, and more. This helps ensure that your furnace is running at peak efficiency and catches any potential problems before they become big (and expensive) problems down the road. 

So don’t forget to schedule annual maintenance for your furnace to avoid heating repair San Juan TX

Replace Your Furnace When Necessary

Even with proper care and maintenance, furnaces don’t last forever—eventually, they will need to be replaced entirely. The average lifespan of a furnace is 15-20 years but this can vary depending on the make/model as well as how well it’s been maintained over the years.

If you’re not sure how old your furnace is or if it’s time for a replacement, simply call a qualified heating repair San Juan TX technician—they will be able to advise you on what needs to be done next.


If your heater stops working, it can be a real nightmare. No heat means no warmth, and no warmth can mean a very uncomfortable home. But don’t panic! We’re here to help.

At Colair, we have over 30 years of experience dealing with heating systems. We know how to troubleshoot the problem and get your heat back up and running in no time.

So if you find yourself in a situation where there’s no heat, just give us a call and we’ll be there to help. Emergency service is available, so you don’t have to wait until business hours to get the help you need.  We’ll get your heat back on, and you can get back to being comfortable in your home.Call us at 956-255-2409 to schedule your service!