Lennox Hearth II-T C FS - Manual (Page 35)

TROUBLESHOOTING Qualified Technicians Only
Unplug Appliance Before Performing Any Troubleshooting or Maintenance
PAGE 35
PROBLEM CAUSE(S) SOLUTIONS
1. Fire burns with a
lazy orange flame.
Pellets build up in
the UltraGrate TM and
the window gets
sooted up.
There is insufficient combustion air.
Fuel feed rate is too high.
Remove any clinkers or ash from the bottom of the UltraGrate TM that
might be obstructing the primary air holes.
Change to a better grade of fuel if necessary.
Check that the damper has been opened enough for the amount of
fuel feed.
Check that the heat exchange tubes are not coated with ash.
Check ash build up behind the side firebricks. Clean if necessary.
Check gasket seal around the door. Use a thin strip of paper, 1 in.
wide. Open the door and close it on the paper strip. A slight friction
should be felt when the paper strip is pulled. Repeat this process at
various locations around the door gasket. Replace the door gasket
if necessary.
Check for blockage in the air inlet tube, exhaust pipe and termina-
tion. Clean as necessary.
Have your authorized Lennox Hearth Products dealer check your
combustion blower.
Have your authorized Lennox Hearth Products dealer adjust the fuel
feed rate on the control board.
2 . Fire goes out or
stove shuts down
automatically
Stove has run out of fuel.
Pellets are not feeding.
The high limit temperature switch has
tripped.
There is too much combustion air for
the amount of fuel.
The fuel feed rate is too low.
Low Limit disc is not locked in.
Refill hopper.
See Pellets will not feed on following page.
Allow stove to cool for 1 hour and re-light. If the stove has been
operating at a medium to high burn rate and the Room Air Blower
has been turned down low then the Exhaust Blower should be
turned up higher. If this problem persists (particularly at lower burn
rates) then the high limit disc should be replaced by your authorized
dealer.
Adjust the damper to reduce combustion air flow.
Check that the ash pan is latched in the correct position and check
the gasket seal around the ash pan door in the same manner as
above. Replace the ash pan door gasket if necessary.
Relight stove with a higher setting on fuel control (it may not be
possible to operate the stove on the minimum setting due to the
wide range of fuel feed rates with different pellets. The fuel feed rate
trim can be adjusted to compensate for variations in fuel (call your
authorized Lennox Hearth Products dealer adjust the fuel control).
Insufficient heat is reaching the low limit disc (improper damper
adjustment or lack of maintenance may cause) or disc is defective.
3. Stove runs for 30
minutes then shuts
down.
Or
Stove shuts down
when operated at
lower feed rate set-
tings.
The exhaust gas is not up to tempera-
ture.
The low limit disc is not operating cor-
rectly (stuck in open position)
The wires to the low limit disc (on ex-
haust blower housing) are loose or
disconnected.
Press start button and re-light stove if necessary.
Have your authorized Lennox Hearth Products dealer replace the
low limit disc.
Check wires and connections. Make sure there are good connec-
tions between all wires and their terminals.
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