I have a harman guardian advance that i was given. The stove is used. I disassembled and cleaned as best i could. It starts and burns ok but the only time i get get the distribution blower to work is in test mode. The motor sounds ok and spins freely. Ive read this forum and tried all combinations of room vs stove vs auto vs manual etc. no room blower Except when in test mode which is only a minute Any suggestions? Thanks.