" wrote:

My heat went out last year, and the HVAC company came and replaced the
thermocouple. It was cracked.

I noticed this morning that the furnace wasn't working. I don't get
that "click" when I raise the thermostat.

I checked the thermocouple. There's no obvious visible problem.

What else can I check? I really don't want to pay for a service call.

Click from where, the furnace or the thermostat? Could be a lot of
things like a bad thermostat, a bad transformer, broken wire, bad relay,
etc.

Pay for a service call or pay for a class or two at the local tech
school to learn how to troubleshoot all the possibilities and the basic
tools needed for that troubleshooting.

Pete C.