This is the time of year when the weather starts getting colder. many folks use for a back up or heating in general these wall mount vent free heaters. Over the summer when they are not in use they tend to get a small amount of dust in the pilot. When the heater is lit for the first time it may come on for a few minutes then go right back out. A simple matter of blowing out the pilot or flushing it out with a little rust buster will most times easily fix the problem. Easy peasy money for those of you who wish to delve into repair these units.