On Tue, 31 Oct 2006 16:37:27 GMT, "
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.
Caveat first:
I'm not a tech. I don't keep up with the latest developments.

That said, the themostats that I have used essentially connect the two
wires together that come from the boiler in order to turn the boiler
on (i.e. "call for heat"). If his happened in my house I would
disconnect the thermostat and connect those two wires to each other
directly. If the boiler came on properly then I would suspect that the
thermostat was bad or improperly set. If the boiler didn't come on I
would know the thermostat was NOT the problem. I might then check some
of the obvious things like the water feed before I called a
serviceman. I don't fix gas appliances.

Greg Guarino