My furnace is not working properly FAQs

Help! My furnace is not working properly FAQs

Below is a list of furnace is not working properly FAQs we hear from our customers when their forced air furnace is not working properly. If this saves you a service call then we are more than happy to help. If you need further assistance then we will gladly help. You can call us anytime at (719) 491-2971.

Water Leak- furnace is not working properly FAQs

Why is my furnace leaking water?

If you see water pooling up under your furnace it could mean many things. The most common problem is a plugged up p-trap or drain pipe on a high efficient condensing furnace. This happens from time to time. It can even cause the heat to stop working. You should have the furnace looked at. It will probably be an easy-inexpensive fix. The other common problem is a leaking humidifier. A humidifier will start to leak when it is over-due for maintenance. This can cause damage to your furnace or your home. Call a professional. There are many other reasons water collects under your furnace including air conditioner leaks. Your local HVAC pro, Calibrating Air, should have no problem finding and correcting the problem.


Why does my furnace have trouble maintaining temperature?

When the furnace seems to run a lot on cold days some people think it may not be sized properly. Although we do find this to be the case sometimes, it is pretty rare. Most of the time we can attribute long run times to inefficiency due to lack of maintenance. A dirty air filter or dirty blower wheel causes more problems with performance and efficiency than anything else. Have your furnace cleaned once per year and change your air filter every 30-90 days. There are times where we find the furnace was improperly installed,  miss-wired, or not adjusted properly. We can correct a poor installation a lot of the time without a complete reinstall. Just yesterday I found a 2 stage furnace running at only 65% capacity for the last 7 years! All I had to do is move one jumper over. Aside from changing a dirty filter, only an HVAC pro can resolve these issues.


Why is my furnace only blowing cold air?

Most modern furnaces have a lot of safety sensors / switches. If they sense anything abnormal they will switch the furnace to a soft lockout mode. In lockout mode, the circuit board may continue to run the fan and shut down the burners for some time. Sometimes the furnace will kick back on and continue to run for several hours or even days. Typically you will not notice it the first time it happens, but you will notice the indoor temperature when it drops. It can be especially annoying when this happens, because not only does the heat stop flowing, but the air blows cold! The best place to start is change the air filter. Then reset the power. Click here to view our self-help no heat section. If that does not work then it may be more serious. Give us a call.

Why does my furnace make a banging / popping noise?

Do you hear a loud bang sound when the furnace fan kicks on or off? It is a pretty common HVAC sound. It is most likely caused by the ducting. There are many reasons for it, such as a dirty/restrictive air filter, furnace is too big, ducting too small or not enough return air ducts. There are a lot of other reasons, but these are more common. We can investigate the source of the noise and we have many ways to remedy this situation.


Why wont my pilot stay lit?

When relighting your pilot always read any posted safety precautions on the appliance. To light the pilot, you have to hold down on the gas knob for at least 45-60 seconds while holding a lighter or a match at the pilot head. Holding the knob down allows the thermocouple to warm up, which will send a signal to the gas control valve telling it to stay open. If it still goes out you may need a new thermocouple or sometimes a whole new gas valve. This applies to water heaters, boilers, and fireplaces that contain a standing pilot as well. If you need further assistance then give us a call.


Why is my furnace short cycling?

If your furnace is kicking on and off in short cycles, or starts up then shuts right back off, then you likely have a dirty flame sensing rod. Modern furnaces have a safety sensor that will shut the main gas off as soon as it fires up if it does not “sense” a flame. They do this to shut down the furnace in the event there is raw gas pumping through the burners without a proper ignition. When the sensor gets dirty it can give a false reading to the control module. This should be cleaned by a professional. We have seen countless home owners attempt to clean the sensors themselves, and accidentally break the igniter or cause other damage. We have even seen people bend the flame rod unbeknownst to them leading to an explosion hazard. There are other situations that can cause short cycling. The best approach is to call a professional.

What causes a strange / burning smell when the furnace is on?

The most common cause we find when investigating a burning smell is a worn out blower motor. The fan motor will usually get very hot when it is worn out. The bearings will usually tighten up and cause more friction, which causes the motor itself to heat up. This means it is time for a new motor. If you have an older furnace with a belt then the smell could be caused by the belt or pulley. It may need to be replaced or adjusted. Some other smells are caused by, you guessed it, dead animals. Sometimes mice, birds, and other small pests get into the ducts or even the flue pipe and unfortunately, they don’t survive.

If you have a more specific question or if you would like us to diagnose an issue then please call us at (719) 491-2971. We can send an expert technician to your home or office to troubleshoot the problem.