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Furnace and hot water heater keep going off
Please help. We have a furnace and hot water heater in the same room. We have lived in our house for 4 years. The first two years we had no problems with either. Last winter the hot water heater pilot was going out periodically. We had the thermocouple replaced which did not fix the problem but it was the end of the season and didn't have problems. This winter we started having problems again. Anytime the temperature drops below 30 the hot water heater pilot goes out. However, now, in addition to that the furnace will not kick on. We had a different guy come and replaced the thermocouple on the hot water heater again and the gas valve on the furnace. It worked for a week and then once the temp got cold again both continue to go out. Yesterday with one of the experts here we thought we had the problem figured out, that there was not enough oxygen getting into the room so last night we left the doors to the furnace room open. Again, woke up with no heat or hot water. Then we thought that the exhaust pipe is getting cold when the furnace goes off and there is a down draft preventing the furnace from kicking on and also blowing out the pilot on the water heater. However, today the pilot on the water heater stayed on and the furnace would still not go on. Then, we brought a chimney sweeper out and he blew soot out of the chimney hoping this would help. Again tonight the pilot light was still on yet the furnace wouldn't start. Finally, on the third attempt the furnace started but the pilot light on the Water heater went out. We have had 3 professionals and a chimney sweep out and no one can seem to figure out the issue. Both the water heater and the furnace are vented through the same main vent (b-vent maybe but I might be wrong in my terminology). There is no outside air source for the room but again this has only been a problem the past 2 years. We are really hoping someone can help provide some
Insight into what we might be missing.