Tempstar furnace problem

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Old 10-04-14, 10:28 AM
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Tempstar furnace problem

Turned on furnace this morning. It ignites runs for 20 seconds then flame goes out - then reignites, runs again about 20 seconds and goes back out again, over and over. Took off ignitor/ sensor, cleaned it, put it back on, still does the same thing. Any ideas?
 
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Old 10-04-14, 12:06 PM
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Welcome to the forums.

Is this an old unit ? Does it have a control module with an LED on it ?
If you remove the blower door is there any mention of trouble codes on the backside ?

If all no's..... then we'll need the model number of your furnace.
 
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Old 10-04-14, 01:10 PM
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My answer is no to all your questions. The furnace was installed new in May of 2000. It is a Tempstar NTC6100KFA.
 
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Old 10-04-14, 01:51 PM
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Does the main blower come on?
 
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Old 10-04-14, 02:19 PM
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Yes the main blower comes on.
 
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Old 10-04-14, 02:24 PM
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Does this unit have a pilot light that lights first before the main burner?
I'm having trouble finding a service manual.


ICP Gas Furnace Replacement Parts | Model NTC6100KFA1 | SearsPartsDirect
 
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Old 10-04-14, 02:40 PM
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Hey PJ, The pic shows a pilot light. I have seen two different wiring diagrams. One shows the sensor and igniter wired back to the gas valve. One shows a igniter module.
 
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Old 10-04-14, 03:04 PM
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Yes a pilot light came one 1st
 
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Old 10-05-14, 08:09 AM
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Any more thoughts on this problem?
 
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Old 10-05-14, 08:14 AM
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Any more thoughts on this problem -I'm thinking it's a bad ignitor/sensor. What are your thoughts on after market parts?
 
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Old 10-05-14, 08:34 AM
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Old 10-05-14, 09:23 AM
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I'm not familiar enough with your unit to tell you what to replace. It does sound like the sensor/igniter assy is the problem but you're telling us that the main burner runs 20 seconds and then shuts off. That would be more suggestive of an ignition board problem. When a burner originally lights - it should shut down in 5-10 seconds if it's a flame sensor problem.

Normally I'd suggest putting a meter on the flame sense line but you have a combo spark ignition/flame sensor in one line which makes it difficult to measure.
 
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