Gas Furnace Problem

Old 10-26-02, 06:20 AM
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Not all burners light

I have a Heat Controller furnace, model GZU A60 D35N. I smelled gas at the vent outlet when the furnace was running. When I checked the furnace only one burner (out of 3) was lit; it was the burner closest to the ignitor. I've got the burner pulled and have ordered a new one. I'm not sure the burner is the cause of the problem though.
The gas control valve is a Honeywell VR8204C 1092. I am looking for info on whether the pilot line is supposed to be fed first, then the main burner, or what the sequence should be. My thinking is that the gas control valve may not supply the pilot line correctly, so that when the main burner is supplied only the one closest to the ignitor lights. I'd also appreciate any thoughts on how to test the gas control valve. Thanks.
Old 10-27-02, 07:19 PM
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Hello bwolken. Welcome to my Gas Appliances topic & our Do-It-Yourself Web Site.

Based upon the problem description, I would determine the problem to be the cross over paths between the burners. What that means is how the first burner lites the second and the second lites the third.

Lint, dust, spider webs, rust and or corrosion and other debris matter can restrict or block the path the flames takes to lite the other burners. Clearing those should correct the burner lighting problems of the two other burners.

If the is a pilot tube leading out of the gas valve, it supplies the gas to a flame row across the front of the burners. The path of this could also be blocked and or restricted in the same or like manner as described above.

In both the above cases the orifices could be blocked and or restricted. I would not suspect the gas valve to be the problem.

The gas valve supplies the ignition flames first, if there is a small ignition burner tube across the front of the 3 burners. These flames provide the 3 burners with an ignition source and should also heat the flame sensor element.

Additional Suggestions:
Read the manufacturers online web site for problem possibilities, causes and solving methods, part locations, disassembly, reassembly methods, repair procedures and instructions, pictorials and schematics, all or part of which may be available online.

Retail parts dealers can also help determine what the possible problem may be. Bring the make, model and serial numbers if you stop in at the store. The info will help to determine the ignition system and possible problem causes. There locations are listed in the phone book.

If you need further assistance, use the REPLY button to add any additional information or questions. Using this method also moves the topic back up to the top of the list automatically.

Regards & Good Luck, Forum Host & Moderator.
TCB4U2B2B Company Enterprises. Energy Conservation Consultants & Gas Appliance Diagnostics Technicians.

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