The (gas) heater part of the furnace fires up just fine, but the air handler
(blower, fan, etc.) doesn't come on as it should a minute or so after the
furnace heats up - the fan does come on, though, when we move the switch on
the programmable thermostat from "auto" to "on" - just changed the batteries
in the thermostat tonight - checked all of the breakers in the supply
panel - anything else we could look at before calling the AC repair guy?