How do you know if your flue is blocked?

Signs of a blocked chimney and its flue liner include:

An excessive smell of smoke during a fire.
A white residue on the walls of the flue liner.
Water leakage.
Debris falling towards the base of the fireplace.

What happens if you have a blocked vent in your furnace?

Breath easy-change the filter It is not only snow that can strangle a furnace, a very dirty filter can cause the same symptoms as a blocked vent and your furnace will not operate. In a more normal condition, a dirty furnace filter reduces air flow and makes your furnace fan work harder; clean filters can save up to 5% of total electricity use.

Why is the pressure switch on my furnace not working?

Because the pressure switch senses the accumulation of condensate in the furnace drain pan, the furnace will not operate until the condensate drain has been cleared and the condensate can again flow freely.

What causes a furnace to not ignite at the right time?

of 06. Failure to Ignite Caused by a Clogged Condensate Drain In addition to the ignition failures common with a conventional furnace, such as a faulty igniter, ignition problems on a condensing furnace may be related to a clogged flue vent condensate line.

What does it mean when your furnace flue is clogged?

If you see rust or water streaking on the vent, flue, or on your chimney, something may be blocking the flue. Moisture builds inside your furnace pipes when the air can’t properly circulate, and this can result in rust. Soot around your furnace is also an indication of a problem.

What does snow do to a furnace vent?

Drifting snow or snow slides from roofs can bury a furnace air intake pipe. A buried vent means the furnace is starved for the air it needs for combustion. A common symptom is the furnace continuously trying to start up, but never actually turning on.