D. Smoke baffle not in place. Refer to Figure 32 for
proper installation.
E. Automatic damper fails to open. POSSIBLE
CAUSES:
1. Improper thermocouple wiring. Recheck field
wiring against wiring diagram (Figure 23, page
14).
2. No power to electronic control. Check trans-
former wiring. Wiring diagram (Figure 23, page
14).
3. Motor damper return spring too tight. Adjust
for less tension.
F. Room thermostat not working. Reset the high
limit bonnet control by turning counter clockwise
until you hear a click. If this does not correct the
problem, replace thermostat.
FLOORS ARE COLD
A. Return (cold) air grills blocked. Check to make
sure rugs and carpets are not covering return air
grills.
B. Air filter is dirty. Clean or replace air filter, as nec-
essary.
C. System is out of balance. Check supply pipe
dampers or registers to balance system.
BLOWER/MOTOR IS NOISY
A. Blower motor and/or blower housing need tight-
ening.
B. Air filter is dirty. Clean or replace air filter, as nec-
essary.
FURNACE IS NOT BURNING PROPERLY
A. Chimney draft incorrect. Check chimney draft.
With normal wood fire, chimney should draw .03
to .06” W.C. between furnace and barometric
control.
B. Soot and creosote buildup in heat exchanger or
chimney. Clean if necessary.
C. Chimney too low. Increase chimney height.
D. Obstruction in chimney. Check for obstruction
such as loose mortar, bird nests, squirrels nests.
Clean chimney to eliminate obstructions.
E. Not enough fresh air to furnace room. Check for
obstructions in combustions air inlet.
F. Chimney diameter too large. A too cold a chimney
will chill flue gases as they rise up the chimney.
As this gas cools, it becomes heavy and other
gases from the fire try to penetrate this heavy col-
umn of cool air. This results in back puffing, poor
combustion or burning, and may cause odors in
your home.
G. Chimney clean-out door partially open. Make
sure chimney clean-out door is tightly closed.
H. Other fuel burning device connected to same
chimney. Make sure other device enters chimney
at a higher level than your wood furnace. (It is
necessary that the wood furnace have its own
flue.)
I. Remove mesh from chimney cap. It is not de-
signed for wood burning furnaces because it re-
duces your updraft.
J. NEGATIVE PRESSURE. This results from forcing
heated air into an area of your home but then not
returning the same amount of air to the VF-100
Furnace (via a cold air duct or open stairway)
from that same area.
BOX 422 • TOWER, MN 55790 • USA • Tel (218) 753-2330 • www.lamppakuuma.com
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