It's Keeprite , 7 years old with Honeywell Smart Valve 9541M.
Inducer blower and main motor are working fine. After first attempt and two minutes of activity it shuts down and every other attempt is not suxsesfull till I will turn OFF power and restart system again. The same process will repeat itself again...
It's all started in past 2-3 days -worked perfectly through the winter.

Any suggestions?

Have you cleaned the flame senser? Real good with steelwool or veryfine sandpaper, a simpel task and just might help

have you cleaned the flame senser? real good with steelwool or veryfine sandpaper,,a simpel task and just might help

Sorry for this question:
Where exactly it located and how it looks like?