Imperial IABR-36 - Char Broiler - Radiant - 36" Gas Broiler MANUAL

If you mean 'randomly HEAT', then I would suspect the control panel. There would be logic to detect the control touch and convert that into a signal to the controlling system that applies power. If the touch panel is faulty, it may signal for power intermittently.

Most likely the problem is in the heat control switch.Cannot be repaired you will have to replace it. To make sure, swap it with one of the other burners that do not have the problem. If the problem goes away, you know its the switch.

You didn't state whether you used a DCS conversion kit or not. I was able to find conversion instructions for a model similar to yours (not an exact match) but it will give you an idea as to what all is involved.
DCS RGSC 305 Instructions Manual

Your radiant heat element is probably blown. Call kitchenaid for information and replacement part numbers then search online for a good price.

There is an easy way to relight a pilot light in an oven/broiler if you do not have long fireplace matches and you are scared to stick your arm in with a regular lighter: Light a long stick of incense, but do not blow out the flame. Open the broiler door. Turn the oven to "broil" and extend the lit incense stick in \to the back of the broiler space. Wave the incense stick slowly back and forth below the broiler coil towards the rear of the oven until you hear the pilot light ignite, then pull the incense stick out, blow out the flame and insert into an incense holder.

Most likely it needs a new hot surface ignitor, which is normal wear and tear. Can cost you around $200-400, depending on where you live.
DCS oven appliance repair in orange county, ca

Hi,
Your ignitor is bad... as crazy as it sounds they need to pull X number of amps. like 3.2 to 4.5 to make the gas vavle open up. Your ignitor is glowing but is not pulling enough current to trip the gas valve open.

Check out these tips...

http://www.fixya.com/support/r3663023-oven_not_working_or_oven_not_heating

http://www.fixya.com/support/r3907570-buy_appliance_parts_online

Heatman101

Call the service tech it;s under warranty and, this model is notorious for this fault

I would have someone come out. Perhaps a gas plumber first. Gas is not something you want to fool around with yourself.

Hello
I have the manual for your stove in PDF format, I will gladly email it to you.
Eddie Rentas
Tupper Lake NY