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OIl Furnace Fumes in House
Issue: Combustion/Exhaust Fumes back up into house in basement and goes up through vents.
Conditions When This “Does Not” occur:
• When thermostat is kept at a normal daytime temperature. In fact, when these fumes start occurring (thermostat down at night for example), I simply turn up the thermostat to normal daytime temp and fume issue goes away.
• I shut off thermostat at night (as we go to bed) unless temperature colder than -20C - Then I turn on thermostat in early morning to normal temperature – no problems.
Conditions When it “Does Occur”:
• We like the house coolish at night. Normally I would turn thermostat down at night. Obviously the furnace still comes on but less so, meaning it gets colder downstairs between firings. This is when the fume issue starts.
• Only at night
• Last week I stood at the furnace as my wife turned on thermostat in these colder night time conditions – the smell starts and leaves the furnace immediately it fires up, not just after blowing starts. I reported this to the person from Deeth and White.
• When it began years ago, unless it is really cold I simply shut off the furnace at night and restart cold in the morning – no exhaust issues at all. When we leave house thermostat is either up or off, not turned down.
• Clearly this is happening when the temperature in the basement/stack outside is decreased between furnace firings because the issue does not occur at normal set daytime temperatures. The odd part is that when I shut the thermostat off completely and the house gets “really” cold at night, and I turn the furnace on in the morning, no problems - although the difference here is that it stays on until it reaches a high temperature, which can take an hour – getting a chance to heat right up.
• It seems to occur when it is coldish, the thermostat is down, and therefore furnace firing frequency is less often.
• We have exactly the same problem with the hot water heater, although it does not get as bad because it is only on for a very short time.
What I Have Done to this Point:
• 3 Technicians over 5 years – have done the obvious stuff – latest one suggests that distance to outside wall should be 10 feet (which it physically is) but piping to get there is double that.