Parts Explained 2 of 8
Gas Valves and Control Knobs
Every burner on a Viking grill has its own valve behind the control panel; the knob turns the valve's stem, and the valve meters gas from the manifold through a brass orifice into that burner.
What happens between the knob and the flame?
The knob is only a handle on a valve stem. Behind the control panel runs the manifold, the pipe feeding every valve. Turn a knob and its valve opens, sending gas to a brass orifice that aims it into the mouth of the burner, where it draws in air.
The knob decides how much gas; the orifice and burner decide how well it burns. A flame that will not follow the knob points at the valve. One that follows it but burns badly points further along.
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Why do Viking knobs push in before they turn?
On a current 5 Series grill, a main-burner knob is pushed in and held for 5 to 7 seconds while the igniter heats, and only then turned to LITE. Older 100 Series grills are pushed before turning to HIGH.
A knob that no longer pushes or turns the way your manual describes is worth mentioning when you book.
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What makes a knob stiff or sticky?
Viking’s pre-cook checklist treats a knob that will not turn freely as a reason to call for service. The causes are usually dull: grease around the stem, or spiders and insects nesting in the valves over an idle spell like a wet Woodinville winter under a cover.
Heat does the rest: foil lining the grill, or wind driving hot gases back over the control area, can melt knobs. Forcing a stiff knob or spraying anything behind the panel is not the fix.
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What if the flame goes out on LOW or ignores the knob?
On the 5 Series, each main-burner and side-burner valve has a low setting adjusted at the factory for the grill’s gas. Pressure swings, a conversion or the gas itself can push it too high or too low, so a burner that roars or dies on LOW is often the setting, not a broken valve. It is reset at the valve with the burner lit; the rotisserie valve has none.
A flame that barely changes from HIGH to LOW, or a burner that will not shut off, is a valve fault.
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Follow-ups
Can I spray lubricant on a stiff grill knob?
Please do not. Viking's checklist before every use asks whether each knob turns freely and, if one does not, says to call for service. Spray is the wrong fix: aimed behind the panel, it lands where gas and ignition parts sit. Leave the knob at OFF, shut the gas off at the supply, and book a visit with Woodinville Viking Repair, (425) 321-3414.
Is a cracked or melted knob only a cosmetic part?
The knob itself is a simple part, but the heat that melted it is the real finding. Viking ties melted knobs to foil lining the grill and to wind pushing hot gases back toward the control panel. Fit a new knob without finding that heat and the next one melts too. Woodinville Viking Repair, (425) 321-3414, looks at both.
The gas line was just re-plumbed and one burner is weak. Could it be the valve?
It can be. Viking's installation notes warn that pipe-thread compound on the first threads of a fitting can break loose and clog a burner valve or orifice. A burner that weakened straight after new plumbing is worth reporting exactly that way, with the date of the work. Woodinville Viking Repair, (425) 321-3414, then traces where the debris went.