322 resister 323 and and gate 324 will reset flip flop 326 and hence the reclose enable signal as the door 112 is closing optical switches 205 and 206 will repeatedly energizing safety reverse timer 307 to provide safety reverse enable signal the door 112 will reclose the safety reverse timer 307 will de energize in due time if obstruction occurs during door closing movement the safety reverse circuit will cause the door 112 to reverse other situations of garage door opening is reclosed by oscillators 384 and 394 timers 389 and 370 and the associated circuits resistors 381 and 382 and capacitor 385 comprise the timing circuit for the oscillator 384 the components are selected for the osci11ator 384 to generate a low going pulse every five 5 or so minutes to energize timer 389 warning enable timer to provide a hi output that enables an oscillator 394 warning oscillator to conduct through a relay 393 and flash a warning device 390 as warning enable timer 389 de energizes capacitor 373 resistor 368 and and gate 369 will trigger timer 370 to activate relay 376 to reclose the door 112 if the door 112 is closed down limit switch terminals 383b and 383c are closed timing circuit is open no oscillation occurs if the door 112 is open switch terminals 383a and 383c are closed timing circuit is connected the oscillatior 384 starts its timing cycle a disable switch 160 is provided for the purpose of turning off the oscillator 39 s function if so desired another alternative is to block the i r beam 194 with any convenient object nearby existing pushbutton 170 is disconnected from the opener control unit 120.