nordyne vent safety switch
Posted: Thu Feb 19, 2009 9:33 pm
i have a nordyne m3rl 90+ down flow condensing furnace. the vent safety switch trips 1-2 times a day for about a week now. i have checked the vent pipe and condensate lines for blockage and there is none.the vent motor seems to be working properly. what else could be causing this switch to trip