Lennox Hearth L30 DVF-2 ユーザーズマニュアル

TROUBLESHOOTING    Qualified Technicians Only 

 

PAGE 23 

1)  Pilot will not light, and Piezo Igniter does 

not produce a heavy blue spark. 

a. Electrode wire (at Piezo Igniter) not 

pushed completely on. 

b.  Piezo igniter is defective 

•  Make sure connections are solid.   
•  Replace piezo igniter. 

2)  Pilot will not light, but Piezo Igniter pro-

duces a heavy blue spark. 

a. Incorrect lighting procedure. 
b. No gas to appliance due to shut valves or 

disconnected gas lines. 

•  Carefully follow the lighting / operating 

instructions found in the appliance of this 
owner's manual. 

•  Check for multiple gas shut-offs; check 

gas supply lines. 

3)  Pilot will not stay lit. 

a.  Thermocouple is not firmly connected to 

control valve. 

b. Pilot flame is not directed to top of ther-

mocouple. 

c. Thermocouple is defective. Make sure 

connection is solid. 

•  Ensure thermocouple is fully inserted into 

pilot assembly. 

•  Replace thermocouple. 

4)  Pilot flame stays lit, but main burner will 

not light. 

a.  Burner control switch (on control panel) is 

in "OFF" position; or thermostat (if in-
stalled) is turned off or temperature set-
ting is too low. 

b. Electrical wiring is damaged or poorly 

connected 

c.  One of the following components may be 

defective: burner control switch, thermo-
stat, or thermopile. 

•  Position the burner control switch to 

"ON"; or adjust the thermostat. Refer to 
manufacturer's instructions for thermo-
stat. 

•  Refer to Control and Safety Wiring Dia-

gram (Figure 11) and check electrical 
connections. 

•  Refer to Control and Safety Systems 

Wiring Diagram. Electrically bypass 
components one at a time and replace 
defective item. 

5) Smell of gas 

a. Loose fittings may be allowing gas to leak 

out. 

•  Check all joints for leakage: pilot assem-

bly, gas supply system, main burner as-
sembly, pilot and burner adjustment 
screws. Use a proper leak check solu-
tion. WARNING: Never use an open 
flame to check for leaks. 

6) A thin coating of black soot forms on the 

window. NOTE: See page 19, Cleaning 
Glass. 

 

a.  Burner primary air inlet is restricted or 

blocked. 

b.  Flames make contact with logs or other 

surfaces. 

c. Improper 

venting. 

•  Be sure all openings (fresh air inlets) in 

stove are free from dust and debris.  Re-
check these areas periodically. 

•  Make sure ceramic logs are in their cor-

rect positions. 

•  Check for flue blockage, disconnected 

flue, improper installation, negative air 
pressure inside building (with respect to 
exhaust exit), or "down draft" situation.  
Make appropriate corrections. 

7) A white coating forms on windows, logs, 

and / or inside walls of firebox. 

a. Residues / impurities being burned off. 

•  Follow cleaning guidelines outlined in the 

MAINTENANCE section of this manual. 

8) Circulation blower makes a humming 

sound, but there is no circulation air. 

a. Impeller blades in circulation blower are 

dirty. 

b. Circulation blower is defective. 

•  Disconnect electrical power to circulation 

blower, access blower and clean impeller 
blades as outlined in the MAINTE-
NANCE section of this manual. 

•  Replace blower. 

 

 

Thermopile / Thermocouple Operation 
•  Thermopile: Millivolt production should be a minimum of 

325 MV with pilot only. 

•  Thermocouple: Millivolt production should be a minimum of 

14 MV with pilot only. 

 

 

Drop out rate 
•  TP 50-60 MV 
•  TP 1 1/2-2 Min. (3 max.) if longer, replace thermopile.