Built-In Natural Gas Grill Running Low and Slow

Decide first

Call or wait

1. 1

   If the thermometer will not climb on a windy evening, hood shut — Put on a mitt, open the hood and turn the knobs down. Wind can hold the exhaust in and cook the control panel. Grill on a calmer night. Safe to wait

2. 2

   If every burner is weak after a full preheat — Take out any foil and check the grill sits level. Both fine and still weak: the gas reaching it needs a gauge on it. Book this week

3. 3

   If one burner runs low while the rest heat normally — Cook on the others while its flame stays blue. The fault is in that burner, and finding it means lifting it out. Book this week

4. 4

   If a flame burns tall and yellow and you can smell gas — Turn every knob off and close the grill’s gas shutoff. Nothing gets cooked on it again until it has been looked at. Call today

Call today: ring Viking Appliance Repair Mercer Island at (206) 208-3377. Book this week: use the booking page. Safe to wait: not urgent, book when it suits you.

A Viking grill that will not get properly hot is seldom an emergency. Its causes make a short list, and most of it can be ruled in or out from the deck. Work down it in order; each step means something only once the one above it is done.

Give it a fair test first

Plenty of grills that “run cold” were judged too soon. For the current 5 Series, Viking’s troubleshooting asks for the main burners to preheat on HI with the hood closed for 10 to 15 minutes, and the ProSear burner for 3. The same manual warns that a preheat stretched past 15 minutes can overheat the grill. Read the hood thermometer at the end of that window, not five minutes in with the lid up.

Then check three things that choke the heat without breaking anything:

• Foil. Viking rules it out on every part of the grill: racks, drip tray, briquette trays. It upsets the airflow the burners depend on.
• Level. Lay a spirit level across the grates, front to back and then side to side. A grill out of level burns erratically and heats unevenly. On a built-in, re-leveling is installation work.
• Wind. Air comes in at the front and the exhaust leaves at the back. A breeze hitting the rear of the grill, or blowing into the hood gap, upsets that flow, and Viking wants a built-in grill in an exposed spot to have a wind barrier behind it. On a deck open to the water, check what stands behind yours.

A cool grill on a windy evening

One version of “it will not heat up” calls for care rather than patience. If every burner is on HI, the hood is down and the thermometer refuses to climb while the wind is up, Viking warns that the hot gases may be trapped, heating the control panel and knobs instead. Put on an oven mitt, open the hood and turn the knobs down. On breezy days the manual caps a closed hood on high at 15 minutes, and its warranty excludes wind damage such as melted knobs or igniter wires and a discolored control panel.

One burner, or the whole grill?

After a fair test, one question splits the rest in two.

One burner low, the rest normal. The supply is fine, because it feeds all of them. The fault sits with that burner: ports partly blocked, an orifice that needs cleaning, an air shutter out of adjustment, or a burner that went back after cleaning without being centered on its brass orifice. Each of those means lifting the burner out, which is where a visit starts. The rest of the grill can still be used, as long as the weak burner’s flame is small and blue rather than tall and yellow.

Every burner low at once. With foil, level and wind already ruled out, the likeliest shared cause is the gas that reaches the grill.

The supply side, and what gets measured

Start with the one thing you can read yourself. On a 5 Series, look under the drip tray for the rating plate; failing that, it is on the heat shield behind the front panel. Besides the model and serial numbers, it names the gas the grill was set up for. Viking is firm that the gas it burns must match. If the plate and your supply disagree, say so when you book; that is not something to adjust at home.

The rest gets measured, not guessed:

• Line size. For natural gas, Viking sets a floor of 3/4 inch inside diameter, or 1 inch outside, and wants the line sized for the total demand of everything connected to it. Long runs lose pressure, and so does each elbow and tee. A side burner or power burner added to the same run after the grill went in changes that total.
• Pressure. The 5 Series manual asks for at least 5 inches of water column at the inlet and no less than 4 at the manifold with every burner lit. That is read with a gauge, never judged from the flame.
• Regulator. It contains a flexible diaphragm, and Viking says it must not touch the grill body or anything around it. If something stored in the island cabinet is pressing on it, mention that; do not move it yourself.
• Kinks. A flexible line crushed or kinked inside the cabinet starves every burner. Look at it without handling it.

One more clue is indoors: if the kitchen range and other gas appliances have been weak too, the shortfall is upstream of the deck. Say so first when you call.

Older T-Series and E-Series grills

Viking’s older use-and-care manual for these grills gives low heat with the knob on HIGH its own short list: a fuel hose that is bent or kinked, too little gas supply, a single low burner whose orifice or burner needs cleaning, an air shutter set too far open or closed, and other gas appliances at the house running below their normal rate. The same split applies: the owner looks, the technician adjusts.

What to have ready when you book

• The series, and on a 5 Series the gas type printed on the rating plate.
• Whether one burner is weak or all of them.
• How long it preheated, hood closed, before you judged it.
• Whether the wind was up, and whether the knobs got hot.
• Anything added to the gas line since the grill was installed.

Before you ask

Can the gas pressure be turned up at the regulator?

Not by the owner. Viking tunes the regulator and the manifold orifices for the gas named on the rating plate, and the grill has to run on the regulator it was supplied with. Whether the pressure really is short gets read with a gauge before anything is changed. Viking Appliance Repair Mercer Island does that on the visit: (206) 208-3377.

Is it safe to keep cooking on a grill that runs cool?

With care. Viking’s older grill manual counts a grill that will not reach its proper temperature among the signs that the burners and venturi tubes need inspecting at once. Until then, cook only while every flame stays blue and steady, and stop at once for a gas smell, a tall yellow flame or knobs that turn hot.

Does foil on the briquette trays really matter?

Yes. Viking’s rule is that foil never lines any part of the grill. It disturbs the airflow the burners need, which the manual names as a cause of low heat, and it can trap heat around the controls until knobs and ignition parts melt. The warranty excludes that damage, so the foil comes out before anything else is suspected.

grillslow heatnatural gasdeck season