If the mother board keeps failing it sounds like there is an issue with possible surges in power. A spike or drop in power may be taking the board out. Given that the furnace is 12 volts my guess would be power drop more than a spike since the battery and converter "should" buffer any voltage fluctuations. I would check for wiring issues and any loose / dirty connections and voltage levels at the power feed to the board.
__________________
Mike Nancy and the fuzzies
Fulltiming since June 2004
Volvo 660 MH tow vehicle
2005 MS 38RL
2007 Saturn Ion "toad"
2010 Gold Wing "piggyback"
|