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What is the exact make and model on furnace,
model is usually found inside top compartment on a sticker right or lft side inner panel
Te furnace blower is running constantly because it is in lockout mode,
you have to go and read the error code trough the small window of bottom panel.
count the amount of led flash between pauses
Count flash code again , 6 is non existant
Flame sensor probably needs to be cleaned, it is located within the burners, it looks like this picture
Found the error code, says flame rollout switch has sensed flame coming back out
• Check flue and air inlet piping for blockage, proper length, elbows, and termination.
• Check rollout limit switch, the red reset buttom is poped out, press it back in but check for flue blockage.
here is a picture of what it looks like
it is around the burners
push in red button in the middle of switch shown in pictur, there is up to 3 switches like this around the burners
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Happy all is good
there is something wrong with your system and it was not detected with your last service call, you need to resolve this with a full service maybe with a second visit, or a different service tech.
I see that the question is still open , do you need more help?