RUUD Furnace blowing air but not heat


I have a RUUD furnace that stopped blowing hot air last night. I was thinking that it was the high limit switch gone bad BUT the coil ignites and lights but then goes out again after a minute, so since it actually ignites I ruled out that possibility. If the thermostat setting is on AUTO it just keeps blowing continuously (cold air is coming out). I have to turn the setting to OFF in order to stop the blowing. Any other thoughts?

If the blower is continuously blowing, then one of the limit switches is open. It may not be the high limit, but it's certainly one of them. Without knowing more about the unit (model number, photo of the schematic, etc.), it's difficult to offer much more assistance.

February 02, 2016 20:19...

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SOURCE: my heat unit will not blow hot air unless we go

If it does not have a furnace or heating elements for heating, then it is a heat pump, which is rare for a central AC system, but makes sense of the fact that it blows warm air when you reset the pressure switch, which may indicates freon pressure charge problem if your AC system has a reverse valve and uses freon to for heating (heat Pump).

Do you get heating when outside unit runs? if you do, check freon pressure levels and top up to required pressures. The button you depress is a pressure reset switch ... that is if your AC system is a heat pump ... which, as pointed above, it is not common for central ACs.

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If you’ve read our articles, then you know that we are a small, U.S. Veteran-Owned heating and air conditioning company, and pride ourselves on giving people honest, straight answers to their questions. This will be no different – if your furnace is not blowing air on a cold day, it can be concerning. We get more and more furnace questions this time of the year, as temperatures drop, and people transition from air conditioning to heating. But what should you do if your problem is a furnace not blowing air? We have already addressed what to do if you have a furnace blowing cold air, or when your furnace keeps turning on and off repeatedly in different posts, but in this article we will be addressing what to do if your furnace is not blowing air through your ducts at all. As with many of these furnace problems, there are many reasons for your furnace to stop blowing air, some of which you can troubleshoot yourself and some of which will require a licensed HVAC contractor. In this...

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With winter just around the corner, furnace issues could be a potential disaster. Here at Howard Air, in Phoenix, we understand that temperatures in the Valley don’t typically dip below freezing. But, when they do, you don’t want to be caught unaware. Maintaining a working heater is more crucial than just personal comfort as water pipes can freeze and burst, which is always concern.

When the furnace is turned on but not heating and only blowing cold air, there are a few things a homeowner can check before calling our friendly service experts.

These simple, obvious solutions are sometimes easily forgotten and worth double-checking before calling a professional:

Remember, it takes a few minutes for the air to warm up. After heating for 10 minutes or longer, do you notice a temperature change? Double-check the thermostat. Is there someone else in the building that might be lowering the temperature? Check the thermostat’s batteries as some models run entirely...
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Is your furnace running but the air that’s blowing out of your vents seems cold?

There are a couple things you can do to troubleshoot the problem before calling a heating repair company.

Check the thermostat

You might have walked by a vent and noticed the air seemed cool. But is your home staying warm, at the temperature you set it at? If it is, the problem might be a simple thermostat setting.

Check your thermostat and make sure that it is set to “auto” rather than “on.” When set to “on”, the fan on your furnace will blow continually, even when the furnace isn’t actually heating the air.

So if you feel the air blowing out of the vents while the furnace is off, the air will seem cool since it’ll be at about room temperature.

Change the air filter

A dirty air filter restricts airflow into your furnace. Restricted airflow can overheat your furnace, causing a safety control to shut off the burners.

This safety mechanism...

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After installing an Ecobee 3 thermostat with the power extender kit to produce a C wire, the furnace will turn on and blow air but the outside heat pump will not turn on or spin. My furnace is a Trane XL80 and my heat pump is a Trane XE1000 Weatheron. My furnace had a small wire connecting W1 and W2, no wire connected to yellow and a green, blue, and red wire installed. The wires were wire nutted outside of the unit and in order for me to install the power extender kit to make the thermostat turn on, I had to undo the wire nuts and connect the kit between the wires from the thermostat and the furnace wires. I have one red wire that seems like it is coming from the Trane outside but I don't know where to connect it or wire nut it. I forgot to take a picture of the wire nuts before I started (stupid me!) if anyone has an idea on how to make the condenser outside run I would appreciate it. I have photos of the furnace panel and the current connections with the power extender kit if...

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4 Answers

Dirty air filter? Dirty outside coil? Is the outside unit running?

We'd like to understand what you find wrong with hvac1000's answer:

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The outside unit is working, the air filter is clean, the coils are moderately dirty. I opened the unit at 3p.m. to remove a piece of plastic and at 4p.m. it was working fine but not blowing cold. I wish I hadn't opened it to begin with.

We'd like to understand what you find wrong with justkendall's answer:

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Date created: 2017-05-27 Name: Carol C
Location: Delafield, WI

Satisfaction Rating:

Very Satisfied



"10 years and running great!"

We have had our dual system (meaning 2 furnaces with separate zones for upstairs and down) for over ten years and have not had a single issue. We do have them tuned up every fall but not a single repair has been needed. And we live in Wisconsin so you know it runs quite often in the months of October - April. I would definitely buy a RUUD again.

Date created: 2017-02-13 Name: Dan
Location: St. Louis, MO

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Before a homeowner begins working on a furnace, he should check to make sure the thermostat is appropriately set to heat and that it is set above current room temperature, according to's "A Guide to Troubleshooting Your Gas Furnace." Whether the furnace is electric or gas, the blower fan may still function if the heating element fails, producing cold air. In the case of a gas furnace, one should check to see whether the pilot light is still lit. If it has blown out, the homeowner should relight it using the instructions provided by the manufacturer. If the pilot light won't stay alight, one should contact the gas company or a repairman to troubleshoot the problem.

If the furnace is electric, one should check to see if the heating element's circuit breaker may have tripped. If resetting the breaker fails to produce heat, it may be due to a damaged heating element. If the breaker trips again, Hannabery advises not resetting it a second time, as it may be...

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December through February tend to be our colder months. Once you leave your house, between traveling, working in cold spaces, heat not on enough at work, etc most of us freeze through the day. When you get home for the day, you expect to walk in and the house be warm. The last thing you want to find is that the furnace is not working. Even worse, it’s actually blowing cold air!

Most People are not even sure what a furnace is besides the generic “The thing that heats your house.” So, here is a basic understanding of just how your gas furnace works:
You change your thermostat settings to indicate your desired home temperature. This sends a signal to your furnace.
Your gas furnace control board will then ensure that all of your system’s safeties are operational. Safeties are continually monitored throughout the heating process. Natural gas ignites in the furnace and then air is delivered throughout your home via the ductwork (after a 30-second delay). If at any...

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If your furnace is blowing cold air, we’re sorry! It’s a chilly problem that no one should have to deal with during winter in the Atlanta area!

There are several possible causes for a furnace blowing cold air, so it’s hard to give you advice without more information.

But here are 3 common causes you can fix yourself.

1) Thermostat is set to ON
Is your furnace blowing cold air only sometimes? Is the furnace’s blower constantly running?

Check your thermostat. (That’s where a tech will start first, so you should as well.) If your thermostat’s fan setting is set to ON, the furnace blower will constantly run even when your furnace isn’t heating the air.

Solution: Turn your thermostat’s fan setting to AUTO. Now your furnace will only blow warm air.

2) Furnace overheated
Let’s say your furnace blows hot air, then cold air, but then stops blowing any air at all after a while. What’s the problem?

It’s possible your furnace...

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Without a regular maintenance plan, furnaces can experience all kinds of problems. When your furnace fails, the most common behavior is for it to blow with no heat. This your furnaces way of telling you it's a in a "lockout mode".

When the furnace tries to start up but fails to, it pretty much gives up and locks out. The result is your furnace blowing air cool air and leaving you with a cold home.

So the real question is, why is it going into lockout?

Lockouts are for your own safety. It's a way to tell you that "Hey, something not right with me, I'm going to turn myself off so I don't hurt anybody".

The two most common reasons are that your furnace is getting too hot or that it's not able to vent the smoke it produces adequately.

Overheating Condition

The furnace's job is to produce heat and then push that heat throughout your home. However, if produces too much heat or isn't able to circulate that heat throughout your house,...

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Is Your Furnace Blowing Cold Air?

Your furnace might be running just fine, but the air blowing out of your vents feels cold. When it is chilly, having a heater that is not working is a major cause of concern. though several reasons can cause this problem, there are a few things you can do before you call a professional. Here is a guideline to help you troubleshoot and possibly solve the issue.

Check the thermostat

The air coming out of your vents might seem rather cool or your home is not staying as warm as the temperature you set. Maybe your heater is not blowing hot air even though the fan is running. As a result, any air that blows out of the vents while your heater is off will usually feel cold. In such a case, there could be an easy solution, particularly if your thermostat setting is the problem. Regardless of whether the unit is heating the air or not, the fan on a heater will keep on blowing as long as the thermostat is set to ON.


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Gagne A/C brings decades of experience and personalized care to any central heating and cooling system issue. Gagne A/C is a highly experienced installer of HVAC and ductless split A/C units for both residential and commercial needs. Besides emergency air conditioning repair, Gagne A/C is also a highly experienced installer of HVAC and ductless split A/C units for both residential and commercial needs. We specialize in Carrier and also service AC units by leading manufacturers including Trane, Amana, Goodman, Lennox, Honeywell, Rheem, York and more. When your A/C system needs maintenance or repair, contact service experts at Gagne A/C today to stay cool (…or warm) in your home. We repair heating and air conditioning systems, furnaces, heat pumps, and ductless split systems, zoned systems, duct work, air sanitizing systems and everything you need for...

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Have you ever been in your Jamison house in the winter, listening to the furnace trying to heat the house, but noticed that the whole place is still cold? If you checked the heating vents in this situation, you would probably find that there is not much air flow coming out of them, which is why you are still freezing.

It is entirely possible for the furnace to be burning away, producing hot air, without enough of that warm air ever actually being distributed through your home. So it continues to run and run, resulting in excess wear and tear on the heating system that will probably shorten its productive life, as well as keeping your whole home too chilly.

Why does that happen? There are a several common culprits for insufficient air flow from your Jamison furnace. Below is a list of the most frequent offenders, along with solutions for each:

Cause: Dirty or broken air filter.An air filter that has accumulated too much build up or is damaged will slow down air...
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Your heat pump has one job in winter: Keep you warm. Too bad it's failing spectacularly!

But why?

There are two possible issues:

Something is wrong with your heat pump. Your body is playing tricks on you (no, seriously).

Let's explain each of these.

Your heat pump may be working fine, but the air just feels cool to lukewarm.

Here's why: The average body temperature is around 98.6 degF. And, in cold weather, heat pumps tend to blow warm air out at 95degF.

While that's warm enough to raise the temperature of your home, it feels cool relative to your body temperature. This is different from a furnace, which can blast hot air over 100degF.

Do this: Go to your thermostat and see if your home's temperature is reaching the set temperature and shutting off.

If so, everything is fine.

If not, read the next section about common heat pump malfunctions.

BEFORE READING FURTHER: Watch this video on how a heat pump works. It...

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Is your furnace blowing cold air, or maybe it is having problems keeping your house warm.

People are more likely to notice issues with their furnace as temperatures begin to drop and we transition from air conditioning to heating. It might be running just fine when you suddenly realize that the air is not warm. As a matter of fact, the air might be downright cold.

For most of us, the question remains; why is my central heater not blowing hot air? You are probably wondering what the problem is and whether you should be alarmed.

A heater that is blowing cold air can be a cause for concern, particularly on a chilly day.

Since several possible reasons can cause it to blow cold air, it’s hard to give advice without additional information, which is why we will share what we know about this issue. You might be able to complete some of the repair work, but if the scenario is a little bit more technical, you should contact a professional HVAC company to diagnose...

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Joined: 12 Apr 2016
Location: Southern Oregon
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Posts: 11

Post Options Quote Reply Topic: Furnace blows air but no heat
Posted: 18 May 2016 at 3:20pm

My 2014 R-Pod 178 furnace/heater is under the bed. When I turn the thermostat to heat, the furnace clicks on and blows air, but the air never warms up/heats. When I adjust the thermostat temperature up or down, the air temperature doesn't change.


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Joined: 23 Nov 2012
Location: Northwest FL
Online Status: Offline
Posts: 1630

Post Options Quote Reply Posted: 18 May 2016 at 3:31pm

Check that the propane is on. The furnace will not heat unless it is getting propane. Light the kitchen stove and let it burn for 30 seconds to...

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Note: Before you dive into the specific brand review, we highly recommend you to read our elaborate Central Air Conditioner Buying Guide in advance, there are several crucial steps you need to take before you even start to think about the brand.

(Last update: Feb 2017) If you are considering buying a central air conditioner, there are some factors that you need to consider. Like any other manufacturer, Ruud has a broad range of central air conditioning units with each unit suited to nearly each situation. As a way to keep up with their competitors, Ruud strives to produce ACs that are highly efficient and operate at low electric bills. Ruud has been in existence for quite some time and has gained popularity among consumers. Ruud has in the market three series of ACs with different levels of efficiency. However, all central air conditioners offered by Ruud are well built and durable as well as affordable to the consumer. The top list AC in the Ruud market is the Ultra...

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The AC guy is coming out here tonight, but I'm so incredibly nervous that this is going to cost big bucks. We're putting the house on the market next month, and I really don't want to pour a ton of money into the house.

The house is always hot - the unit runs constantly during the summer. However, today, it was hotter than usual. Checked each of the vents and no air was blowing out at all, however, the unit was running.

No ice, filter had just been changed, the "insulated pipe" that he asked me to check was relatively cool - the pipe (no insulation) that was attached to it was ice cold.

He did tell me that the unit is two small for the house - it's a 2 ton when they should have put in at least a 2 1/2, probably a 3.

So, any chance this is just freon?? Or am I looking at buying a new unit??


For whatever the reason, it sounds like your blower(either on furnace or air handler) is not functioning. I would check this out. You might want to...

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Your Lennox heat system is designed to give you years of trouble free service. However, there may be times when things go wrong. When this happens, your equipment will tell you what the problem is.

You simply need to know where to look for Lennox furnace diagnostic codes. You also need to interpret them. Here is information to help you with these conditions.

Where to look

In most cases, you will need to go to your blower access panel. There should be a control board on that panel. This is where you need to look.

The control panel

Your control panel serves several functions. This panel controls the operation of the blower motor. It also controls the ignition system of the unit. You will notice terminals for the thermostat wires.

There is also a red button for diagnosing problems with the unit. This button will have two led lights associated with it. They are usually labeled “DIAG1” and “DIAG2”.

To the right of the red button will be...

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