My burner ignites, then goes out and ignites again?

This problem is called a short cycle and can be solved as follows:

1. Check if there is an accumulation of ash around the detonator. If this is the case, remove the ashes so the detonator can feel the flame.
2. The setting of the burner fan motor may be incorrect. The lock on the settings should be set at half or at three quarters.

3. Your detonator may detect the flame. In this case, the detonator must be replaced.