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I haave a magic chef furnace model #VR800A 1012 how do you get to the pilot and thermal coupler when there is only a inch or two between the burner and the bottom of the furnace does burner come out as a tray? Pilot went out during the night and will not relight and we're getting a foot of snow!!!! Thanks Jerry

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  • susan ross Mar 16, 2011

    does burner tray come out how

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A thermocouple is used in keeping pilot lights lit in water heaters, boilers, furnaces. Opening gas valves in ovens. A thermocouple has a heavy copper wire leading into the pilot flame, the pilot flame heats the upper 1/3 of the thermocouple lead, generates up to 35 millivolts and energizes a coil to hold the gas valve open; new furnaces do not have thermocouples, they use electronics to sense flame.

Anyone trick there, just need to be patiente, first shut the gas off to the furnace, unthread the thermocouple from the gas valve and from the pilot assembly. Just reinstall it the same way to removed it. Just make sure when you re-light the furnace that the end of the thermocoupler is recieving a direct hit from the pilot flame.

A thermocouple is generic except for it's length. Thermocouples are made in different lengths. Measure the removed part or take the one you remove to any hardware store and replace it with an exact duplicate in length. The parts cost is very nominal.

New thermocouple packages will contain complete do-it-yourself installation instructions and pictures. The package also contains additional clips of various assortments. None may not even be needed.

Not all the parts contained in the package with the thermocouple will be needed. The packages contain an assortment of holding parts and clips that are generic and designed to fit a wide variety of applications.

Install new T-Couple into pilot assembly exactly as the existing one is installed. Element end must be placed exactly the same height as the exiting one. Re-install pilot assembly as found.

Gently thread nut end of T-Couple into gas control valve, starting threads by hand to insure threads will not cross thread and become damaged. Tighten nut snugly but do not overtighten. Just snugly until lightly bottoms out.

Be sure the pilot flame is all blue and no yellow. If any yellow or doubt pilot flame is correct or maybe dusty, clean it out. Blow out pilot flame and allow assembly to cool. Use can of computer keyboard canned air cleaner to blow out the entire assembly.

Re-light pilot and note the result. Test the pilot again note any changes. Also be sure the T-Couple is correctly installed in the pilot assembly. Only the tip of T-Couple or about top 1/3 should be heated. Must be glowing a bright cherry red color.

Hope this helps.

Posted on Mar 16, 2011

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The connection to the gas valve is electronic, so proper contact is critical. disconnect and reconnect to finger tight, then EXACTLY one-quarter turn more with the proper wrench, no more, no less, if it wont stay lit, then you might need a new thermocoupler.

Posted on Mar 16, 2011

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