This is my first post here, and I am hoping for some help. I have a comfortmaker furnace, GUH series. Last winter it would intermittently shut down, usually on very cold nights. The blink code would be 6-blinks, meaning the condensate sensor was grounded.
I had just purchased my home, and under warranty the tech came out two or three times. By the time the tech would arrive, the problem would have been corrected (either I reset the furnace control panel with its switch, or by itself). All three times, the tech checked the condensate line/trap/sensor/etc, and could not find a problem! As spring arived, it happened less, so by summer I had forgotten, almsot assuming it was fixed.
Well, this november, it began happening again, and I had a different service company come out. They checked the line, trap, and it was clear. (Luckily, they came out when the furnace was actually still blinking). And even after checking it all and resetting, the code still came up. They had to physically detach either the sensor or the wire to get it to fire up. Im still waiting for him to get back to me, and I was hoping you could help me get soem sense of what's going on so the tech(s) don't go overboard (if its a bad wire, I dont want them to replace everything). In the meantime, he told me to just unplug the sensor when this happens, because the line is fine. I don't like this, but it gets heat in the house! Any ideas guys?