Lenoxx Optima 3 FS Manuale Utente

PAGE 39 

1. Fire burns with a 

lazy orange flame. 

Pellets build up in 

the grate 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). 

 

There is insufficient combustion air. 

 

Lack of maintenance (clean Ultragrate

, clean-out ports, exhaust 

flow passages, venting system, exhaust 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 gasket around ashpan. 

 

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. 

 

Fuel trim may need to be adjusted down for faster feeding fuels. 

 

Change to a better grade of fuel if necessary. 

 

Check that the damper has been opened enough for the amount of 
fuel fed. 

 

Have Your Authorized Lennox Hearth Products dealer check your 

exhaust blower for proper operation. 

 

The venting system design is too restrictive (call your authorized 

Lennox Hearth Products Technician to evaluate how the installation 

can be corrected to satisfy the exhaust flow requirements of the 

appliance). 

 

2. Fire goes out or 

stove shuts down 

automatically 

 

Stove has run out of fuel. 

 

Pellets are not feeding.  

 

The high limit disc (thermal switch) has 

tripped. 

 

 

 

 

There is too much combustion air for 

the amount of fuel. 

Refill hopper. 

 

See (Pellets will not feed) this 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 fan 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. 

 

3. Pellets will not 

feed. 

 

The hopper is empty. 

 

The auger motor or control board may 

be defective. The pressure switch tap 

or hose may be blocked.  

 

Back pressure in venting tripping pres-

sure switch. 

 

 

 

Thermostat is in stand-by mode. 

 

 

Thermostat wires disconnect. 

 

High limit disc (thermal switch) may 

have been tripped. 

 

Self-aligning bearings in auger motor 

may be mis-aligned. 

Refill hopper. 

 

Check to be sure that there is no blockage in the pressure tap or 

hose. Have your authorized Lennox Hearth Products dealer diag-

nose the problem and clean or replace any necessary parts. 

 

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. 

 

Check to see if thermostat is set to low or if sun is shining directly 

on thermostat. 

 

Re-install wires. 

 

Allow stove to cool. Increase room air blower setting. 

 

 

Gently tap the auger motor.