2 of the front igniters do not function

Do other appliances in your home using LP gas work properly? If so, then this is probably an air/fuel mix problem on the burner(s). If this is a new rangetop there should be directions with the range and the LP conversion kit to instruct on proper adjustments. Be certain the correct LP orifice was installed for each burner (they likely have different BTU ratings for different sized burners) and the ignitor post is clean and spaced properly to burner. Then adjust the air mix to achieve a blue flame with just a tip of yellow. Delayed ignition usually results from the wrong air/gas mixture which doesn't ignite until too much fuel has accumulated. In many locations the company you purchase LP gas from will have someone who can check and adjust this. If the range was shipped from the factory as LP gas ready, then you can also contact your dealer and request assistance.

Here is the part to order.

Close the valve in the gas line connected to the Thermador oven. Unplug the cooktop's electrical cord from the wall outlet.
Remove the screws under the front edge of the Thermador cooktop below the cabinet to release the cooktop from the countertop.

Put on work gloves then raise the cooktop at an angle. Recruit a friend to hold up the appliance while you work on the igniter underneath. The igniter is a pronged strip of black metal in a housing wired with two plugs connected to power sockets underneath the Thermador cooktop.

Disconnect the two wired plugs on the end of the igniter from the sockets.
Take out the two screws in the metal plate that hold the igniter in position under the Thermador cooktop. Pull the igniter out of the mounting bracket in the cooktop.
Hold the new igniter by the housing and insert the part into the mounting bracket. Secure it with the two screws.
Connect the two wired plugs to the sockets. One plug is larger than the other, which makes it simple to connect them correctly.

Lower the Thermador cooktop into position on the countertop and reattach it with the screws through the underside of the front edge.
Plug in the cooktop's power cord and open the valve in the gas line.

Burner lights fine but goes out after about 10 sec.??

Hi,
Here is a tip that I wrote to help people troubleshoot problems with their cooktops not igniting.

Cooktop Range Stove spark ignition does not work
http://www.fixya.com/support/r5649407-cooktop_range_stove_spark_ignition_not

heatman101

x low burners run through gas valve
simmer controller,potentiometer,gas valve fault?
2 months is still warranty contact bsh (thermador)
unit is still under warranty

Most gas range tops no longer have pilot lights but use an electronic ignition (sparker) to light the burner. Normally when you turn the burner on you should here a snapping or sparking sound, at which point the burner should ignite. Here is a link to the user manual for 36" - 5 burner Thermador rangetop...maybe this will help: http://dl.owneriq.net/a/ac64ae7b-1ed3-44a3-9235-e4dbd8fe4628.pdf

By the way, in the short term you could always use a match to light the burner. JUST BE VERY CAREFUL THE YOU HAVE THE MATCH LIT AND OVER THE DESIRED BURNER BEFORE YOU TURN KNOB TO START THE BURNER!!!!

Ours did the same, I unplugged the stove for 1 minute and afterwards the burners worked fine.

I would say that pop was one of you igniters.  either that or the stove is not installed correctly and when it gets warm, thermal expansion makes the metal pop.  I would say that I would use caution and discontinue its use.  Most problems with these need to fixed professionally.

The Viking manual says that an ignitor that continues to try to light even after the burner has been lit indicates improper grounding, and that an electrician should be consulted.

Perhaps you could try to replace the ignitor, and see if that fixes the problem?

I have a similar age, 6-burner 36" rangetop.

We have an older Thermador Gas Cooktop type range. It was working fine until the cleaning crew came in, then all the burner igniters were clicking when turning on a single burner. I solved the problem by cleaning off the igniters. I first of course unplugged the power. Then I took a small wire telcom pic tool to scrape the white and brown deposits from the sides of the igniters. You could probably use something else similiar to do the scraping. I noticed a shiny surface underneath. I then went ahead and scraped and brushed clean the mating surface where the spark travels. I then vacuumed up the mess. My burners all worked great after this. Hope this helps!