We have had three different techs out because our Carrier Gas furnace went out the
First one change the ignighter switch it worked a while then went out again 3 days later
The 2nd tech came out he tested everything says its nothing wrong with it but maybe the
Safety switch is sticking so he worked on it awhile left and it work again for 3 or 4 days
The 3rd tech came back out cleared some coils which he could not believe the other two
Techs had not done and said that should fix it well it worked again for 4 or 5 days this time
And it went out again yesterday. We flip the breaker and it comes back on so it sounds
Electrical or maybe the thermostate? Any ideas anyone? The furnace is 17yrs old never
Malfunctioned until now.

If it operates after fliping the circuit breaker you are doing a reset. Now if it was me I would be calling the company back since you spent big $$$ and your unit is still not working. Anything here will be guess work since we are not there to check it ourselves. The circuit board could be a problem as well as pressure switches.

What hvac1000 said. And please use punctuation marks!