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Problem
7. Creosote Running From Draft
Inlet Openings
CHIMNEY-RELATED
PROBLEMS
1. Creosote Accumulation
2. Tar and Liquid Creosote
Leaking From Metal Flue
Joints
Possible Cause
6. Heater dampered down too
much
7. Combustor not functioning
1. Burning wet, pitchy woods
2. Burning too much wood in
one load
3. Cool heater walls
1. Leading bypass baffle plate
2. Types and amounts of wood
burned
3. Poorly insulated chimney
4. Combustor not functioning
1. No chimney cap on
chimney
2. Metal flue assembled
improperly
3. Normal increase in moisture
due to catalytic burning
(Condenses on cool
chimney walls)
Solution
6. Ensure that proper air
mixture and draft are
available for wood pyrolysis
to continue
7. See section on “Combustor-
Related Problems”
1. Burn dry, seasoned wood
2. Burn reasonably sized loads
so the combustor has a
chance to burn the wood
gases that are produced.
3. Keep a good bed of coals in
the heater
1. Replace any damaged parts
2. Try not to burn pitchy wood
Don’t overstuff the firebox,
burn pieces of wood with an
approximate diameter of 6”
or larger
3. Replace single-walled metal
chimneys with double-walled
insulated chimney sections
(Meet local codes) Install a
chimney liner in a masonry
chimney. (Meet local codes)
In new installations utilize an
interior chimney rather than
an exterior one
4. See section on “Combustor-
Related Problems”
1. Install a chimney cap
2. Top flue sections should be
inserted into lower flue
sections
3. Replace single-walled
chimneys with doubled-
walled insulated sections
(Meet local codes) Install
chimney liner in masonry
chimney (Meet local codes)
In new installations try to
utilize an interior chimney
rather than an exterior one.