We've had an oil smell coming through our vents for about a year. Our
local heating service company has come out twice and found nothing.
Neither the smoke detectors nor the carbon monoxide detector protest
and we haven't had any apparent health effets. Yesterday I realized
that the smell only comes through only after the temperature exceeds
the setting on the thermostat and contines for a while until the fan
stops blowing. I don't know if it works this way but I'm guessing that
the fan keeps going for a little while after the flame is out. If so,
that seems to be when the oil smell occurs.
I would appreciate your advice/thoughts.
I will say it again I am not HVAC person
However from mechanical point view it seems
that you are having some oil residue that it needs to
be burn out, you also may have draft problem
check your smoke stock make sure you are not getting
down flow on shut down, does your chimney is adjusted
for proper draft, any chance that your furnace creating
vacuum in your basement, does your ignition system
shut off before the oil, defective pump shut-off valve,
the air entrapped in nozzle due to restriction in supply line
oil expansion in the nozzle line assy. due to radiated heat
at shut down, make sure that you have makeup air at
location of furnace, your chimney temperature
perhaps some what low for the draft require or needed,
Good luck from Dido
I'm think he is suspecting that once the burners stop the furnace is
drawing some exhaust back into the house. If the furnace is inside the
house and there is a leak in the distribution side outside the
conditioned space the furnace could be pulling make up air back through
the exhaust. It would fit the conditions described.
Steve Scott wrote:
Thanks all for the replies. Furnace repair is over my head, for sure.
I've decided to call a different service company (and hand them a
summary of your responses.) I'll report back here for your interest on
what they say/find/do. Wish me luck. I don't want to have to buy a new
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