We've been having some issues with our gas furnace. Most times when the thermostat goes below its target temp turning the furnace on, but the burner doesn't light. Thhe ignitor heats up tries to light the burner, but instead of it lighting it just shuts the gas off. Then just blows cold air through the system for a few minutes, shuts off and it tries to light again. Sometimes going through this cycle 3 or 4 times before finally lighting.

The furnace is 13 years old, and uses a hot surface ignitor. The thermostat we use is programmable. We just bought the house, so we have no idea of what has been replaced, or if the other owners were even having problems with it.