I have a Empire Comfort System model CIDV-30-1 that won't come on with the thermostat. The pilot light is on, but it won't come on unless I turn the 3 position rocker switch on the back of the unit to On. But that just by-passes the thermostat, so I have to turn it on and off manually. Here is a list of parts I have changed; Thermopile, thermostat, ensured the thermostat wires ok to the thermostat.