payne model 396jaz048065


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Old 11-29-11, 02:04 PM
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payne model 396jaz048065

the problem is that the heater shuts down after running for a few minutes
 
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Old 11-29-11, 03:20 PM
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You need to take the cover off the burner compartment of the furnace and observe and report in detail the sequence of events which take place when you turn up the thermostat.
 
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Old 11-29-11, 05:57 PM
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it comes on runs great then shuts off the main flame just drops off actually sometimes the flame will start again when its almost gone im not sure what they call the box that supplies gas tyo the unit and pilot but that is where the zap noise comes from the part that looks like a little coil
 
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Old 11-29-11, 06:03 PM
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Sorry, but your last post provides no useful information. Refer to my earlier post on what information you need to provide if we are going to be able to help you.
 
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Old 11-29-11, 06:52 PM
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ok the pilot lights then the burner lights up then the fan comes on as i said after that about 5min. the flame starts goig out sometimes this occurs right away other times it tries to stay light that is when the little solenoid on top of the fuel distribution unit is doing its little zap noises another thing im not quiote sure about is the upper cover safety switch i had that cover off and when the unit shut down i started it back up using that safety switch only sometimes on the fan would run by itself
 
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Old 11-29-11, 07:51 PM
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The pilot orifice and pilot burner are dirty and need to be disassembled and cleaned.

There is a heat sensitive switch that is part of the pilot burner. When it gets hot enough it switches on the main burner. If the flame is marginal the switch will cool off enough to shut the main burner off, and you will see the main burner cycling on and off as you describe with the pilot burner remaining lit. That's about the only thing that typically causes that symptom.

You need to remove the screws that hold the pilot burner in place with a 1/4" nutdriver. Then pull out the pilot burner by gently bending the pilot tubing.

Use a 7/16" open end wrench to loosen the brass nut that holds the pilot tubing in place. When you remove the brass nut, usually the pilot orifice will fall out.

Blow out the pilot orifice and use the wire from a wire brush to clean the pilot orifice.

Use a wire brush to clean any dust and dirt from the rest of the pilot burner and use compressed air, canned air or your breath through a straw to blow any dust and dirty from the pilot burner.

Reassemble and reinstall the pilot burner and you should be back in business.

Cleaning the pilot orifice like this annually is annual maintenance on the furnace and will avoid this kind of problem in the future.
 
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Old 11-30-11, 12:16 AM
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As long as you have the pilot burner out, remove each main burner in turn. Blow out any dust and use a wire brush to brush any rust off the burners.

If rust has visibly enlarged the burner ports in the middle of the burner compared with either end of the burner, the burners should be replaced.

Rusted burners or rusted out burner ports will cause large amounts of rust and carbon monoxide to be produced by the furnace. The carbon monoxide can be deadly if the heat exchangers are defective or soot can plug the heat exchangers which will cause the furnace to quit working.

Cleaning the burners should be done annually when the pilot burner is cleaned as annual maintenance as well.
 
 

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