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PROBLEM CAUSE(S) SOLUTIONS
1. Fire burns with a lazy orange flame. Pellets build up
in the and there is excessive glass soot that is difficult to
remove (Ash and soot are a product of combustion with
any wood products, so some build-up on the glass is
normal).
A)
• There is insufficient combustion air.
• Fuel feed rate is too high.
A
1
) Lack of maintenance (clean UltraGrate™, clean-out ports,
exhaust flow passages, venting system, combustion blower
intake, etc.
• Remove any clinkers or ash from the bottom of the UltraGrate
that might be obstructing the primary air holes.
• Check that the heat exchange tubes are not coated with
ash.
• Clean internal exhaust ducts.
• 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 or exhaust pipe. Clean
as Necessary.
• Inspect glass seal to ensure that it is in good condition and
is properly seated to the door.
A
2
) Fuel trim may need to be adjusted down for faster feeding
fuels.
A
3
) Change to a better grade of fuel if necessary. Check that
the damper has been opened enough for the amount of fuel
fed.
A
4
) Have your Lennox Hearth Products dealer check your
combustion blower for proper operation.
A
5
) The venting system design is too restrictive (call your
Lennox Hearth Products Technician to evaluate how the
installation can be corrected to satisfy the exhaust flow
requirements of the appliance).
A
6
) Adjust the damper to increase combustion air flow.
2. Fire goes out or stove shuts down automatically A) Stove has run out of fuel.
B) Pellets are not feeding.
C) The high limit temperature switch has
tripped.
D) There is too much combustion air for
the amount of fuel.
E) The proof of fire switch is opening,
disconnecting power to the auger
motor.
A) Refill hopper.
B) See (Pellets will not feed) this Page.
C) Allow the appliance to cool for 1 hour, then re-light. If the stove
has been operating at a medium to high burn rate with the room air
blower adjusted to low, there may not be enough air flow to dissipate
the heat. On higher feed rates, adjust the blower speed to a higher
setting. If this problem persists (particularly at lower burn rates) then
the high limit thermal switch may need to be replaced by your dealer.
D) Adjust the damper to reduce combustion air flow.
E) Clean proof of fire switch (see maintenance section). If this does
not correct problem, check switch for proper operation. Replace if
necessary.
3. Pellets will not feed. A) The hopper is empty.
B) The auger motor or control board may
be defective. The pressure switch tap
or hose may be blocked.
C) Back pressure in venting tripping
pressure switch.
D) Thermostat is in stand-by mode.
E) Thermostat wires disconnected.
F) High limit thermal switch may have
been tripped.
G) Self-aligning bearings in auger motor
may be misaligned.
H) Fines or wet fuel in auger.
I) Hopper lid is open.
J) Hopper lid switch is faulty.
A) Refill hopper.
B) Check to be sure that there is no blockage in the pressure tap or
hose. Have your Lennox Hearth Products dealer diagnose the prob-
lem and clean or replace any necessary parts.
C) If new installation check for excessive 90˚ bends, long horizontal
runs or excessive vertical run of 3” pipe. Possibly change to 4” pipe.
If older installation check for excessive ash accumulation in pipe or
other obstructions. Clean out pipe.
D) Check to see if thermostat is set to low or if sun is shining directly
on thermostat.
E) Reinstall wires.
F) Allow stove to cool. Increase room air blower setting.
G) Gently tap the auger motor.
H) Clean out fines or wet fuel in auger and hopper. Use PFI certified
fuel only and store bags in a dry location.
I) Close Hopper Lid.
J) Replace hopper lid switch if determined to be faulty.
QUALIFIED TECHNICIANS ONLY
Unplug Appliance Before Performing Any Troubleshooting or Maintenance
TROUBLESHOOTING