Lennox Hearth L30 DVF-2 TROUBLESHOOTING Qualified Technicians Only, Problem, Causes, Solutions

TROUBLESHOOTING Qualified Technicians Only

	PROBLEM	CAUSE(S)		SOLUTIONS
1)	Pilot will not light, and Piezo Igniter does	a. Electrode wire (at Piezo Igniter) not	•	Make sure connections are solid.
	not produce a heavy blue spark.	pushed completely on.	•	Replace piezo igniter.
		b. Piezo igniter is defective
2)	Pilot will not light, but Piezo Igniter pro-	a. Incorrect lighting procedure.	•	Carefully follow the lighting / operating
	duces a heavy blue spark.	b. No gas to appliance due to shut valves or		instructions found in the appliance of this
		disconnected gas lines.		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	•	Ensure thermocouple is fully inserted into
		control valve.		pilot assembly.
		b. Pilot flame is not directed to top of ther-	•	Replace thermocouple.
		mocouple.
		c. Thermocouple is defective. Make sure
		connection is solid.
4)	Pilot flame stays lit, but main burner will	a. Burner control switch (on control panel) is	•	Position the burner control switch to
	not light.	in "OFF" position; or thermostat (if in-		"ON"; or adjust the thermostat. Refer to
		stalled) is turned off or temperature set-		manufacturer's instructions for thermo-
		ting is too low.		stat.
		b. Electrical wiring is damaged or poorly	•	Refer to Control and Safety Wiring Dia-
		connected		gram (Figure 11) and check electrical
		c. One of the following components may be		connections.
		defective: burner control switch, thermo-	•	Refer to Control and Safety Systems
		stat, or thermopile.		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	•	Check all joints for leakage: pilot assem-
		out.		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		a. Burner primary air inlet is restricted or	•	Be sure all openings (fresh air inlets) in
	window. NOTE: See page 19, Cleaning	blocked.		stove are free from dust and debris. Re-
	Glass.	b. Flames make contact with logs or other		check these areas periodically.
		surfaces.	•	Make sure ceramic logs are in their cor-
		c. Improper venting.		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,		a. Residues / impurities being burned off.	•	Follow cleaning guidelines outlined in the
	and / or inside walls of firebox.			MAINTENANCE section of this manual.
8) Circulation blower makes a humming		a. Impeller blades in circulation blower are	•	Disconnect electrical power to circulation
	sound, but there is no circulation air.	dirty.		blower, access blower and clean impeller
		b. Circulation blower is defective.		blades as outlined in the MAINTE-
				NANCE section of this manual.
			•	Replace blower.

REFERENCE INFORMATION FOR QUALIFIED TECHNICIAN: 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.

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