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Old 01-09-09, 04:14 PM
jumpstart jumpstart is offline
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Join Date: Jan 2009
Location: MN
Posts: 6
Need help diagnosing Tempstar furnace

Tempstar model number NUGS050AF01 (weird, but prob iCP)
SN: L913825416

House is walkout ramber.
Split system furnace in basement/ac outside

hot surface ignition control board White Rodgers 50E47=843
No rust on/in furnace. (It actually looks new)

It has a fan timer on it with setting controls that is seperate from the limit switch.

Once in a while the limit switch has needed replacing.
The first time it was like 30 below. He put in the wrong part.
Another guy came out and replaced that and the thermostat
yada yada yada Different reasons.

This went out two nights ago when it got real cold.

I was told that the person who lives down there had the vents covered. (she likes it cold) She had the return air screen I had installed when I first moved in with boxes too and etc. All vents are cleared and I took out the filter. Add to that, a new filter that was not what I normally used. She put it in the wrong way.

I put in another limit switch. But now I can't get the ingition surface to ignite.

My hot ignition control when I turn on the furnace goes to the yellow for 2 secs, the solid green and I hear clicks, then it locks out.

Can someone help troubleshoot this? I have jumper handy and I tried to do this, but I had a heck of a day.

When I turn on the furnace, I have the t stat on above the actual temp in house. The inducer goes on like it should first, the blower will only go on (of course) if I have that on ON instead of Auto. Well, that would be because it does not ignite.

I have already tested the t stat by jumping them. That does not seem to be an issue.

So, any kind takers on this one? I could use a beer, but can't.

Last edited by jumpstart; 01-09-09 at 04:40 PM. Reason: need info
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