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circulating pump on/boiler burner does not come on

I have a fhw, 3-zone, baseboard heat system. The three zones are fed by three circulating pumps. I replaced all three thermostats with programmable thermostats and one zone now does not work.

When the new thermostat turns the system "on", the circulating pump turns on, but the boiler does not. Unless another zone is "on", the system then circulates water that has not been warmed.

There are just two wires (red and white) that connect to the thermostat.

Things worked fine before the thermostat switch. However, nothing in either the two-wire set-up or the process of changing the thermostat seemed unusual (at least vs. the 2 zones that continue to work).

Any ideas?

Thanks very much!

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