Have an Avalon 'Vashon' stove... been installed for years, running perfectly. All of a sudden yesterday, thermostat clicks on and the pilot doesn't ignite a full flame to heat the room. I turned everything off, and started from scratch after a while. Power switch on, ignitor works and pilot stays lit, flame control doesn't seem to matter. Move the thermostat from off to hi, and nothing happens. I thought thermostat, so I removed and touched the wires together (assuming eliminate the switch to diagnose), and no change. The pilot flame burning looks normal, but is there a valve or pressure switch or something that allows gas to flow into the dissipator (not even sure if this is the right term)? Or is there some residue or buildup issue that I can't see? Thanks for any help... getting kind of cold.