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Did this start after you changed thermostat or before?
Also here is a manual with code information at the back
Lennox G61 Manual
It explains on page 91 of the manual I sent you plus it tells you what all the codes are.
Did this happen before or after the thermostat change?
ok, if you tell me what the lights are doing..or you can look in manual and
i can tell you what happened
Bottom section with blower.
There will be 2 lights. There may be a pop out safety that cuts power that would need to be held in or taped down
you will need to hold the door switch in. The lights are on the circuit board where all the wires go
And what pattern are they blinking? The ones we want are labeld ds1 and ds2
what are the lights doing as far as flashes
Was the filter plugged?
But this issue started before filter change?
I think we tripped a high heat safety because of filter plugged..and when it cooled it did not return closed.
See this HERE
A credit card sized flat plate in upper section against back wall with 2 wires...tell me when you find this
size of credit card...sits flat against the back wall?
turn power off to furnace...tap that plate 3-4 times...
Turn power back on and tell me code
It appears you need a new limit switch or another switch in the series has been tripped. I am afraid it is at the point where you will need to call for service. A Lennox dealer will have the right parts on truck