Hi all! We have a10-12 year old VC Radiance DV2600 propane direct vent gas stove. Pilot lights fine; and until recently all worked well using the optionally equipped unit with 'on-off-thermostat' switch on back of stove that also has the rheostat for fan speed. A few days ago, stove failed to light when switch was set in the thermostat position; but would light and work in the 'on' position. Now, the stove will not light in either thermostat or on position; but the pilot remains lit normally. I have tried 'shorting' the two leads at the thermostat end - with no response. Ideas?