You probably have a minor problem with the spark ignition. The ignighter might be shorted to ground, or the flame sensor is not working right.
Try lighting it with a BBQ lighter. See if the flame stays on or not.
If that fails, or it stays lit for a few seconds then goes off, you probably will need to take it someplace.
Fred.
Money can't buy happiness but somehow it's more comfortable to cry in a
Porsche or Country Coach!
If there's a WILL, I want to be in it!
I havn't been everywhere, but it's on my list.
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