Viking professional gas range isn't heating properly

First you need to get a nice blue steady flame to prove to the ignition module there is flame. Check you orifice and bypass tube.

Gas ovens / stovetop that use gas and not electricity. These work by igniting gas and use actual flame on the the stovetop.

Newest cook top styles, such as the induction or halogen cook tops combine the same style to produce more even heating. Some of these ovens feature thermal limiters or thermostats that regulate the burner system. I offer free advice bcuz God is so good!

GAS OVENS
The spark igniter tip is dirty (can clean it with either a little wire brush or a piece of fine sandpaper).
2) The Pilot flame is too low, and the tip of the igniter is not in the flame good enough. (the flame acts as a circuit when it touches the tip & completes the circuit).
3) The spark module is no good and needs to be replaced.(But 1 & 2 are your best bet).
spark module does not sense the flame when it's on. The spark igniter is also the flame sensor which provides feedback to the spark module.

Make sure the igniter is properly aligned with the burner lighting holes and it is clean. All lighting holes must be clean too. You can enlarge them using a drill bit one size bigger.

If it would not fix the problem, replace the bake burner and the igniter.
There is a small chance for the spark module itself to be bad as well.

The oven safety valve
(also called the gas valve) is the part that ensures that gas is not released until the igniter has reached the correct temperature needed to ignite the gas. While this part can fail, it is uncommon. If the hot surface igniter does not glow you should first verify that you have voltage to the circuit. This is a live voltage check and should be performed by a qualified person. If voltage is lost at the valve terminals then you should verify the continuity of the bi-metal in the valve using a multi-meter.

since neither light is going on, then i believe that you either have a bad thermostat, or possibly that you only have half of the voltage going to it, and gaggenau doesn't have gas units so it doesn't have a glow bar like the previous guy said.

the glow plug may be working as in its glowing,but even so they can seem to be working,but if they are weak they can appear o.k. but wont pass enough current to completely open the gas valve and keep it fully open,thats why it sometimes wont light or if they do the flame is wavering or small and you smell gas,just replace the glow plug

is it gas or electric and you should always send the model number off of the machine so we can help you better.if it's gas, you should be able to see the ignitor start to glow orange,when it does start to glow the ignitor should lite the flame within 40 seconds,if it doesn't then you have a bad ignitor,if you can't see it glowing remove the racks and take up the floor so you can see it.if you need more help send the model number,if it's a regular stove with the 4 burners on top open the bottom draw under the oven door,look on the frame and you'll see a tag with the model and serial number,just need the model number

Opening and closing the door will reset the ignition sequence, do not do this repeatedly as you could cause a build-up of unburned gas in your heat exchanger and damage it. Instead verify that your ignitor is glowing, then see if the burner lights and make sure the flame carries all the way down to the bottom of the burner. If the flame stalls halfway or doesn't make it all the way to the bottom in 4 seconds after 3 attempts you will experience an ignition lockout, a safety feature built into your ignition module. If this is the case your burner needs to be cleaned and serviced, have a professional do it.
If the flame is reaching the bottom of the burner but still going out after about 4 seconds then you have a dirty/broken flame sensor. You can attempt to clean your flame sensor by removing the screw that holds it into the burner. With it removed it will look like a metal rod going through some ceramic, clean the metal rod part with a wire brush or emory cloth (fine sandpaper). Replace the flame rod and try again and see if the burner stays on this time. If it still goes out your burner needs to be serviced by a licensed technician.

Your glowbar ignitor part must be replaced, Unplug the range and turn off the gas. Remove yje oven racks, The oven base pan. Then remove the flame spreader. You will see the glowbar ignitor attached to the side of the bake burner. Remove it and replace it with a new ignitor. Replace all the range parts.Turn on the power and turn on the gas supply.

Copy and paste this site for the location of the ignitor you can also purchase the part from them.

http://www.appliancepartspros.com/partsearch/model.aspx?model_id=111359&diagram_id=362260#d362260

Hello there: The oven bake burner and ignition components are located beneath the oven cavity. In most cases the oven bottom panel can be removed for access (check your owner's manual) but on some models the oven burner has to be accessed from below in the warming or broiler drawer area. If accessing from the top, a 'flame spreader' (flat metal plate) above the burner may also need to be removed to see the burner itself.Many ovens use a single oven burner in which case they only have a single gas valve and ignitor. The same burner is used for both bake and broil functions, the broil usually being in the drawer area below the oven. Higher-end models may have a separate bake and broil burner. On such a system there will be two ignitors, one for each burner. They may also employ a 'dual' gas valve (see illustration above) instead of using a separate valve for each burner.Some range models may have an additional broil burner located at the top of the oven cavity which may be referred to as a 'waist high' broil. If not, broiling usually takes place in the drawer area below the oven, which uses the same bake burner for the broil function. Most gas ranges currently available employ one of 3 basic gas ignition systems; pilot ignition, hot surface ignition system (which uses a 'glow bar' or 'glow coil' - aka an "ignitor") and a spark ignition system. The latter two being referred to as "electronic ignition" systems as they use electricity in one form or another to operate the oven heating system. Only the pilot ignition system has an actual "pilot" (which is a small but real "flame") which might need manual lighting.
If the surface burners of a range are a spark ignition type, the oven IS one of the possible kinds of electronic ignition systems and thus will not usually have a "pilot" which needs lighting. Be aware though that just because the surface burners might light via a spark doesn't necessarily mean the oven uses the spark type ignition system too.
There is one older style of electronic ignition system which does also use an oven pilot but it is very rare and such a system hasn't been used in oven models since the early to mid 70's. It is the 'constant pilot' *electronic ignition* system.


Making Observations
The oven burner's operation will usually need to be directly observed while in operation as the first step to troubleshooting problems.Ignition System Type Links
Ignition System Types:

Pilot Ignition

Electronic Ignition with Constant Pilot (rare)

Electronic Ignition with Glow Ignitor (most common)

Spark Ignition System

Is there continuity between the oven gas valve's terminals?


Hot Surface ('Glow Bar') Ignition System (most common)
This is the most popular system currently used for ovens and is comprised of a control mechanism (whether thermostat or electronic control), the oven ignitor and an oven gas valve.


What happens in this style ignition system is that the thermostat or electronic control switches power to the oven ignitor and gas valve circuit which are connected in series (one after the other). As power flows through the ignitor it heats and draws current (measured in amperage). Once the oven ignitor draws a specific amount of current the oven valve opens to allow gas to flow to the oven burner where the glowing hot ignitor (glow bar) ignites it. Power must continually flow through the ignitor and oven gas valve for gas to be released into the oven burner to create a flame.

It should usually only take in the area of 30-90 seconds for the oven ignitor to reach the proper resistance to allow the proper amperage to reach the gas valve to open it and for the ignitor to ignite the gas at the oven burner.

glow plug needs to draw 4 amps to open gas valve even if it red hot ...not drawing 4 amps replace glow plug

HI thanks for your question. the part that's at fault, is the igniter. it glows but not hot enough to ignite all the gas. replace the igniter. thanks the appliance doc. please rate my answer. thanks.