The Furnace Cycle:
T-stat feels chilly and calls for heat
Control board starts blower
Sail switch closes
Control board starts ignightor and opens gas valve
Control board switches to "Flame Sense" senses flame (Or Skip to not)
Operation continues till T-Stat feels all warm and cuddled (Says STOP)
Control board shuts down burner and starts timer
Control board shuts down blower
(NOT) control shuts off gas, waits and tries again and again and if still no flame goes into lock out and shuts down .
Possible problems:
Low batteries or bad electrical connections prevent blower from reaching speed
Obstructions in/on heat vents prevent air flow from reaching speed
Sail switch not sailing or not closing
Bad control board
Bad Solenoid
Clogged burner orifice
Ignition points too far apart (Very popular)
NO PROPANE or obstruction in propane line or propane valve closed
Bad flame sensor
Bad flame sensing circuit on control board
Happened to me twice 1st time due to spark gap (Points) and 2nd time bad control board.
IF it is the board...... DINOSAUR BOARDS are lower in cost and much higher in quality in my not very humble opinion, also made in the USA.
