Tappan Gas furnace (old) Pilot Light Problem

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Old 11-20-12, 05:43 PM
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Tappan Gas furnace (old) Pilot Light Problem

This furnace has a pilot light (not electronic ignition)

Problem: Pilot goes out when furnace shuts off when thermostat temperature is reached. Pilot can be re-lit and stays on until furnace goes off due to thermostat control.

What part causes the problem?

Tappan Model # GUF120D42E5
 
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Old 11-20-12, 05:52 PM
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The most common reason for pilot outages is a pilot burner and pilot orifice that are dirty and need to be cleaned.

What does the pilot light look like? It should be a sharp flame like a small blowtorch that engulfs the tip of the thermocouple. Yellow tipping of the pilot flame or a lazy flame that's easy to blow around (and out) like a candle are good indications of a dirty pilot.

But cleaning the pilot orifice and pilot burner are generally the first thing to do whether the pilot flame looks good or not.
 
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Old 11-20-12, 06:42 PM
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Shutting off the gas and removing the 1/4" tubing to the pilot is required to gain access to the pilot orifice.
 
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Old 11-20-12, 08:48 PM
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Could an early heat exchanger failure also cause this ?
 
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Old 11-20-12, 08:57 PM
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A hole or crack in the heat exchanger can cause air to blow across the pilot light and blow it out.

Less likely to be a problem when the fan shuts off.

The smart thing to do is to look at the most likely causes of a problem first, and the most likely cause of pilot outages is a dirty pilot.
 
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