Originally Posted by mel s
See the trouble shooting instructions in this pdf: http://www.bdub.net/manuals/Suburban_Service_Manual.pdf
BTW I very much doubt that the click you hear is the sail switch.
When the sail switch in my Suberban in my SF-42F furnace closes or opens it doesn't "click" loud enough for me to hear...(however I can hear the click of the "gas valve").
Hot air blowing means main flame is lighting off........but then dropping out and locking out due to 'lack of flame proving' That is why you have to reset using the t-stat
Flame proving is done by 'flame ionization' ---a milivolt signal is generated and sent back to circuit board -----no signal board shuts down gas valve. Usually will make 3 attempts then lock out
Burner slots obstructed and flame isn't engulfing spark electrode
Spark electrode is not centered over burner slots
Spark gap is not correct---S/B 1/8"
High Tension wire from board to electrode connections are loose/dirty (doesn't take much resistance to stop milivolt)
Ceramic is cracked allowing milivolt signal to jump to ground
Which Suburban Model do you have??