[Justasiam313]

I have a old Luxaire in my new home... I know it needs to be replaced but I need it to get me through the winter... Just last week I had someone come out and look at it they told me it was good and should get me through the winter... I turned it on yesterday it worked all day... late last night it started acting like the blower wanted to come one and then it would turn right back off... it kept doing this so I rushed downstairs and just shut the whole thing off... this morning I went down to the limit relay auto/man box on the side and I turned it on man and turn up the heat and it came back on working fine... :D once the house was warmed back up I turned it back to auto and it started doing it all over again... I tried it again in man it it just keep doing the same thing... can someone tell me its just the blower motor... I don't have $5,000 right now... :confused:

[twinkiedooter]

It's not the blower motor that is your problem. It sounds like a capacator is going bad. Best to have a repair person check it out with a multitester and replace the part before it really gets cold. You don't need a new furnace. Just a repair part.

Also, your furnace may have what is called a "pulse" heating system. My new home had this pulse system and it drove me nuts. The furnace would come on, run for about 2 minutes and then turn itself off and on for another 4 minutes. I called the furnace company and was told that this was normal for that furnace to do. I even had a repair person repair my system when a component failed and I was advised about this "pulse" system some electric furnaces have. I was also told that I could not just change the pulse system for something else without changing out the entire furnace.

The pulse system is supposed to be an energy saver system.

[letmetellu]

This could be the internal protector in your furnace that is making the blower go on and off. But it also could be the fan switch that is either set wrong or is so out of calavration that it does not work right.

Tell me what your fan switch looks like. Is it a combination fan and limit switch. This would be silver box up on the firewall of your furnace. It may have a round disk in it with three pointers on a ring of numbers. Take the cover off so that you can see the disk, watch it rotate as your furnace is operating. If the disk turns to a point and the blower comes on and then goes to a higher point and the blower goes off. Try resetting the pointers. To do this hold the dial so that it will not turn move the lower pointer to about 105 degrees move the next pointer up the scale to about 150 degrees. Do not move the next pointer because that is the limit switch.

If you do not have the kind of fan and limit switch I am talking about this info will not help you.

So let me know what happens.

[Justasiam313]

This could be the internal protector in your furnace that is making the blower go on and off. But it also could be the fan switch that is either set wrong or is so out of calavration that it does not work right.

Tell me what your fan switch looks like. Is it a combination fan and limit switch. This would be silver box up on the firewall of your furnace. It may have a round disk in it with three pointers on a ring of numbers. Take the cover off so that you can see the disk, watch it rotate as your furnace is operating. If the disk turns to a point and the blower comes on and then goes to a higher point and the blower goes off. Try resetting the pointers. To do this hold the dial so that it will not turn move the lower pointer to about 105 degrees move the next pointer up the scale to about 150 degrees. Do not move the next pointer because that is the limit switch.

If you do not have the kind of fan and limit switch I am talking about this info will not help you.

So let me know what happens.

This is just what it looks like... I put them at 105 and 150 and it still acts like it want to start... I don't think it is the blower motor either because it keep acting like it want to start but something is stopping it...

[letmetellu]

When the motor does start how long does it run before it stops and then how long is it off before it tries to start again.

[Justasiam313]

When the motor does start how long does it run before it stops and then how long is it off before it trys to start again.

It runs for about 30 sec and about 5 minutes before it tries to run again... Im thinking it's the motor because it smoking hot...

[Justasiam313]

When the motor does start how long does it run before it stops and then how long is it off before it trys to start again.

It runs for about 30 sec and about 5 minutes before it tries to run again... Im thinking it's the motor because it smoking hot... Im thinking that's its getting hot and it shuts itself down...

[Missouri Bound]

Leav it on manual until you can have someone look at it. Many people run the fan continuously. If it runs OK on manual, then it isn't a blower problem. When you switch it to manual it works fine, is that what you said? I suspect there is a problem with the fan control itself. Start there. Combination fan / limit controls can go bad.

[Justasiam313]

Leav it on manual until you can have someone look at it. Many people run the fan continuously. If it runs OK on manual, then it isn't a blower problem. When you switch it to manual it works fine, is that what you said? I suspect there is a problem with the fan control itself. Start there. Combination fan / limit controls can go bad.

It was working fine that way... its not working in either auto or man

[hvacservicetech_07]

Id say you have a bad fan motor. It has a built in overload, once it overheats it shuts down until it cools.