I do not think your answer is correct. My FS(flame sensor) gets electrically excited within seconds on a cold startup...about 4 volts going through it when you put a low voltage tester on it. The FS sets above the HSI(hot start igniter) and in front of the pilot lighter mouth. In fact the the pilot light flame lights off the HSI in about 10 seconds, while the FS gets "excited" in about 4 seconds. Maybe from the heat from the HSI??
Then the main burners light in about 15 - 20 seconds.
I just put in a new FS/HSI combo unit...bought late last year for $55.00...and so far so good. It is still cycling the main burners on and off, about 6 - 8 seconds off and 2 - 6 minutes on. As long as they keep coming back on until T-stat is satisfied!! Will know for sure in 2 - 3 days.
well coolman 1973, I will accept your answer so you can get paid. if I find out that the burners are supposed to cycle on/off...then everything is cool. if they are not supposed to..well, time to look for bad rollout switch, thermal limit switch,etc..
Merry Christmas fromCustomer