A simple checklist of what to look for in diagnosing a problem before calling in the professionals. Simple things to look for that may have you stumped and possibly even the experts. Modern, and some older, appliances are very prone to minor bugs in the system that are in the end quite easy to fix . Often times a couple of tools or jet of air may be all that is needed. In no way do I suggest that anyone attempt to repair, Gerry rig , mishandle, reconfigure, or operate a malfunctioning piece of equipment. You, your family and the public safety should be paramount prior to any attempt on gas fired appliances. That being said let the do it your self-er inside each of us save some hard earned money.