Lennox Hearth EBVI25, EBVI30 manual 19

TROUBLESHOOTING THE MILLIVOLT GAS CONTROL SYSTEM

Note: Before troubleshooting the gas control system, be sure external gas shut off valve (located at gas supply inlet) is in the

“ON” position. Important: Valve system troubleshooting should only be accomplished by a qualified service technician.

	SYMPTOM		POSSIBLE CAUSES			CORRECTIVE ACTION
1) Spark igniter will not light		A. Electrode wire (at piezo igniter) not pushed completely		• Check connection
pilot after repeated triggering of		on.
igniter button.
		B.	Piezo igniter is defective	•	Replace piezo igniter
WARNING: IF THE PILOT WILL
		C. Defective or misaligned electrode at pilot (spark at		• Using a match, light pilot. If pilot lights, turn off pilot and trigger the igniter
NOTLIGHTAFTERONEMINUTE
		electrode)		button again. If pilot lights, an improper gas mixture caused the bad lighting
OF ATTEMPTING, WAIT FOR AT
				and a longer purge period is recommended. If pilot will not light – check gap at
LEAST FIVE MINUTES FOR GAS
				electrode and pilot – It should be between 1/8” and 3/16.” If the gap is out of this
TO CLEAR BEFORE ATTEMPT-
				range, adjust the gap or replace the pilot assembly. See Page 11, Figure 25.
ING AGAIN.
		D. Incorrect lighting procedure		• Carefully follow the lighting instructions on Pages 15 &16 or as found in the
				insert control compartment.
		E. Gas supply problem		•	Check for multiple gas shut-offs. Check gas supply lines. Check inlet gas
				pressure. It should be within the limits as marked on the rating plate.
		F. Pilot orifice plugged		• Clean or replace pilot orifice
2) Pilot will not stay lit after		A. Thermocouple is not firmly connected to control valve		• Check connection at valve
carefully following the lighting
		B. Pilot flame is not directed to top of thermocouple		• Ensure thermocouple is fully inserted into pilot assembly. Clean and/or adjust
instructions.
				pilot for maximum flame impingement on thermocouple if necessary.
		C. Thermocouple is defective. The millivolt production		•	Replace thermocouple
		should be a minimum of 14 MV with pilot only.
3)	Pilot flame stays lit, but	A. Burner control switch (off/on switch, wall thermostat		• Turn burner off/on switch on and/or refer to instructions provided with optional
main burner will not light		or remote control) is in “OFF” position; or thermostat (if		thermostat or remote control, if applicable.
(valve pilot/off/on knob is in		installed) is set to a temperature setting that is too low.
ON position, off/on switch, wall
		B. Electrical wiring is damaged or poorly connected or		• Check wall switch and wires for proper connections. Refer to Millivolt Wiring
thermostat or remote control is
set to ON).		remote switch is defective.		Diagram(Page12,Figure28). Jumpthewireacrossterminalsatthewallswitch,
				if the burner comes on, replace the defective wall switch. If okay, jumper the
Read important note below.				wires across the wall switch wires at the valve. If the burner comes on, wires
	IMPORTANT NOTE: If an			are faulty or connections are bad.
		C.	One of the following components may be defective:	•	Refer to Millivolt Wiring Diagram (Page 12, Figure 28). Electrically bypass
	optional Remote Switch*
		burner control switch, thermostat, vent spill switch, or		components one at a time and replace defective item.
	is used for burner opera-
		thermopile. Thermopile: Millivolt production should be a
	tion and if the standard
		minimum of 325 MV with pilot only.
	burner OFF/ON switch is
	still installed on appli-	D. Thermopile may not be generating sufficient mil-		• Check thermopile with millivolt meter. Take reading at thermopile terminals
	ance, it must be in the
			livolts	of gas valve. It should read 325 millivolts minimum with optional wall switch
	"OFF" position.
				“OFF.” Replace faulty thermopile if reading is below specified minimum.
		E.	Plugged burner orifice	• Check burner orifice for blockage and remove.
		F. OFF/ON Switch & Remote Switch* are in the "ON"		• When turning on the burner using a Remote Switch,* ensure that the
			position resulting in excessive resistance	standard OFF/ON Switch is in the "OFF" position. If both switches are in
				the ON position, it may result in excessive resistance (& millivolt drainage)
				and the burner may not come on.
4)	Frequentpilot/burneroutage	A. Pilot flame may be too low or blowing (high) causing		• Clean and/or adjust pilot flame for maximum flame impingement on thermo-
problem		the pilot/valve safety to drop out.		couple. See Page 11, Figure 25.
5) Main burner stays lit for up		A. Vent is blocked; flue gas is “spilling,” which activates		• Examine venting system for blockage. Remove any blockage.
to 10 minutes and then shuts off,		the spill switch and shuts down the burner.
pilot flame remains lit.
		B. The house is negatively pressurized resulting in spill		• Open a window to see if the problem is corrected.
		switch activation.
6)	Smell of gas	A. Pilot, gas supply system, or pilot & burner adjustment		• WARNING: NEVER USE AN OPEN FLAME TO CHECK FOR LEAKS.
		screwsonvalvemaybeleaking. FOLLOW INSTRUCTIONS		After the gas company or fire department has given clearance to re-enter the
		ON THE COVER OF THIS MANUAL		dwelling, have a qualified technician test all gas joints from the gas meter to
				the gas heater regulator for leaks using a gas leak test solution (also referred
				to as bubble leak solution).
7) A thin coating of black soot		A.	Burner primary air inlet is restricted or blocked	• Ensure all openings (fresh air inlets) in the insert are free from dust and debris.
forms on the window.				Recheck these areas periodically.
Note: See Page 5, Glass Clean-		B.	Flames make contact with logs or other surfaces	• Ensure ceramic logs are in their correct positions.
ing.		C.	Improper venting	•	Check for flue blockage, disconnected flue, improper installation.		Make
				appropriate corrections.
8)	A white coating forms on	A. Residues/impurities being burned off or impurities in		• Follow cleaning guidelines outlined in the MAINTENANCE section of this
windows,logs,and/orinsidewalls		the fuel		manual.
of firebox.
*Optional Remote Switch kits: wall switch, wall thermostatNOTE:or remoteDIAGRAMScontrol& ILLUSTRATIONS.				ARE NOT TO SCALE.			19