I hope some one can help me. I have a Nordyne gas furnace, only about a month old. I installed it myself and everything worked fine for the first few weeks. Now there is no heat. The first time this happened, I turned on the heat and the blower turned on immediately along with the exhaust vent blower but not the igniter. After a few seconds the exhaust vent shuts off and the blower continues to run. I unplugged the unit for awhile and plugged it back in and all was good for about a week. Now the same thing is happening. But this time leaving it unplugged doesn’t seam to help. Normally the exhaust vent blower starts and the glow igniter turns on then the flame heats up for awhile and then the blower kicks in.
When I first plug it in the green light and the red light are on and the yellow light are off. When I turn on the heater the blower comes on with no heat and the green light is flashing and the other lights are off. The diagram sticker said that the flashing light means that there is a fault in the vent limiter switch. Where is this switch and how do I test it. Is that the round thing with two wires and a small hose coming from the exhaust vent housing?

Since you installed it yourself there could be a few thing causing the problem. To start with who did the start up and check out of the unit? I am sure they checked the gas pressure and flow rate across the heat exchanger for starters. What I am trying to say here is that there is a lot more to installing a furnace than taking it out of the box and just putting it in.

The vent limiter switch is being triggered for a reason and more than likely it is a missed item during the install. I would suggest that you have a heating professional look over your install and make corrections if necessary before you go on a defective parts hunt. Most new units do not just fail or have parts on them that go bad in a week or two. Your unit will be back on quicker with less problems if it is checked out.

This is a prime example of a homeowner thinking a furnace change out is a DIY project. Trying to save a little bit of money can end up costing you just as much if not more.

Yep especially when and if thy find out Nordyne will not warranty the parts since it was not professionally installed.

D.I.Y. can have a happy ending. I was experimenting with my laser level and now my vision is 20-20.

Oh yeah.

I can't speak for others on this site but when I have to come in and go through a cluster that a home owner has managed to muck up it really irks me. An irate service tech can lead to higher repair costs.

Actually I only did the rough installation. The start up was performed by one of the HVAC Techs that work for me as a Construction Manager. I just didn't want to bother him. But I see that the group on this thread are more interested in tooting the horns of their profession then helping people out. I am a Construction professional skilled in many trades. HVAC is definitely not my strongest skill. But if someone asked me for some advice on Construction Management I am sure I would do my best to give them good advice. And not talk a bunch of bull crap just because he doesn't know what he's doing. Why do you go on here if you know everything?

Some circuit board controls will power up the inducer and blower together on a call for heat if the pressure switch is stuck in the closed or engaged position. Try removing one wire from the pressure switch, then turn the heat on. If the operating sequence you noticed previously is altered, you are on the right track.

My two posts contain the truth. If I were you I would bother that alleged HVAC tech that did the start up and have it repaired professionally. I have known many construction managers and usually they are jacks of all trades and master of none because they do not know enough about any one of them to make a good living so they get hired on as a whip to crack and a pencil to push the schedule on. They also have to listen to all the crap from the unhappy customers. Call in your HVAC guy and be safe about it.

Thanks for the advice KC13. I tested all of the limit switches with a ohm meter. When I was testing one of them I noticed it had a reset button that had tripped. I rest it and all is good now.

Now all you need to do is find out why it tripped to start with or it will happen again usually when it is extremely cold..

The resetable switch was most likely a flame rollout switch. Check to make sure venting is properly sized and sloped. I do agree with the other post here. There are many factors when installing a new furnace. We will try to help correct any installation problems that may have occurred. Would be best to have the pro hvac tech in to thouroghly look all aspects of the system install over. Please let us know what you find. Take care.

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Originally Posted by toolvault

Actually I only did the rough installation. The start up was performed by one of the HVAC Techs that work for me as a Construction Manager. I just didn't want to bother him. But I see that the group on this thread are more interested in tooting the horns of their profession then helping people out. I am a Construction professional skilled in many trades. HVAC is definitely not my strongest skill. But if someone asked me for some advice on Construction Management I am sure I would do my best to give them good advice. And not talk a bunch of bull crap just because he doesn’t know what he’s doing. Why do you go on here if you know everything?

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I'm glad you came back, sometimes we can be arses after a long day of personal anger management... it's just that people who think they know it all really annoy those of us who do.:D

Is it a 90% furnace