"xanadu" wrote in message
oups.com...
I have a Dunkirk oil burner. When we went to turn it on last night,
the heat worked fine in the sexond floor (we have two heating zone, two
thermostats), but nothing on the first floor. The first floor
thermostat is in fine working condition--I reset all the settings,
checked the wiring and put in new batteries. What could this be?


First, it is not the burner. That just heats water.

Most likely, the circulator pump of the first floor zone is not working.
The thermostat switches a relay that turns on the pump. You should be able
to feel it running.

If you have a single pump, it could be a defective zone valve.