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Bert Kohen

06:30AM | 03/05/03
Member Since: 03/03/03
1 lifetime posts
Bvhvac
My Carrier Weather Maker 58SXC furnace seems to quit when the temperature outside drops to about minus 10C (14F) or below. It will start, shut itself down after about 15-20 minutes, run again for 5 to 7 minutes, shut itself down, start again, run for a couple of minutes and shut itself down for good. Then I have to reset the furnace by switching the power to the furnace off and on. Then the cycle starts again. All this time the thermostat is calling for heat. If the room temperature is around the thermostat set point, it runs OK, starting and stopping as it should to maintain the set temperature. I disconnected the outside air supply and started the furnace on inside air and it ran for 4 hours before it shut itself down while the thermostat was still calling for heat. I noticed that in running it on inside air it took a lot longer to heat the place. The limit switch and the pressure switch were changed: it did not help. The board self-test indicates no problems. Has any one encountered this? Any suggestions? I had heard that high efficiency furnaces were prone to operating trouble when the outside temperaturee reached certain lows (or perhaps at certain temperature differentials between inside and outside) but I can't find any references....

ACD

03:13AM | 03/06/03
Member Since: 10/15/02
359 lifetime posts
My one small furnace I installed did the exact same thing, but it didnt matter what the outside temperature was. The sump wasnt draining properly so the sensors on the exhaust blower would see insufficient flow and shut it down. Wonder if its a condensation thing.
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