Desa GVB35N Trouble- Shooting, Continued, ing and Maintenance, Maintenance, page, Lighting

28

TROUBLE- SHOOTING

Continued

OBSERVED	POSSIBLE
PROBLEM	CAUSE		REMEDY
Burner backfiring	1.	Burner orifice is	1.	Clean burner (see Clean-
during combustion.		clogged or damaged.		ing and Maintenance,
				page	25)	or	replace
				burner orifice.
	2.	Burner damaged.	2.	Replace burner.
	3.	Gas regulator defective.	3.	Replace control valve.
	4.	Delayed ignition.	4.	See above.
Yellow flame during	1. Not enough air.		1.	Check burner for dirt and
burner combustion.				debris. If		found, clean
				burner (see Cleaning and
				Maintenance, page 25.
	2.	Gas regulator defective.	2.	Replace control valve.
Slight smoke or odor	1. Residues from manu-		1.	Problem will stop after a
during initial operation.		facturing processes.		few hours of operation.
Burner fails to	1.	Pilot flame not lit.	1.	Light	pilot burner (see
respond to thermo-				Lighting		Instructions,
stat.				page 20).
	2.	Pilot flame not properly	2.	Pilot flame needs adjust-
		heating end of thermo-		ing. Contact a qualified
		couple.		service person.
	3.	Pilot burner orifice	3.	Clean	pilot burner (see
		clogged or damaged.		Cleaning		and	Mainte-
				nance, page 25).
	4.	Control valve defec-	4.	Replace control valve.
		tive.
	5.	Temperature at thermo-
		stat bulb satisfied.
Heater produces a	1. Air in gas line.		1.	Operate burner until air is
whistling noise when				removed from line. Have
burner is lit.				gas line checked by local
				natural gas company.
	2.	Air passageways on	2.	Observe minimum instal-
		heater blocked.		lation	clearances (see
				Figure 3, page 7).
	3.	Dirty or partially	3.	Clean burner (see Clean-
		clogged burner orifice.		ing and Maintenance,
				page	25)	or	replace
				burner orifice.

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