You mean it lights but still clicks? Don't follow that.
Mine will begin with the fan running and then the clicking and then it lights (or not). If it fails to light, I have to turn the thermostat to "off" and wait for the fan to stop then turn the thermostat back to "on" and try again. Sometimes it takes a few tries to get it to light if it has not been running lately, or after arriving after a drive. Once it gets going that first time, it behaves itself, cycling as set by the thermostat.
I have an older model from 1991.