Desa CGN20TLB Maintenance, page, Troubleshooting, Continued, Observed Problem, Possible Cause

OWNER’S MANUAL

TROUBLESHOOTING

Continued

OBSERVED PROBLEM	POSSIBLE CAUSE		REMEDY
Burner does not light after ODS/pilot is lit	1.	Burner orifice is clogged	1.	Clean burner (see Cleaning and Mainte-
				nance, page 13) or replace burner orifice
	2.	Burner orifice diameter is too small	2.	Replace burner orifice
	3.	Inlet gas pressure is too low	3.	Contact local natural gas company
Delayed ignition of burner	1.	Manifold pressure is too low	1.	Contact local natural gas company
	2.	Burner orifice is clogged	2.	Clean burner (see Cleaning and Mainte-
				nance, page 13) or replace burner orifice
Burner backfiring during combustion	1.	Burner orifice is clogged or damaged	1.	Clean burner (see Cleaning and Mainte-
				nance, page 13) or replace burner orifice
	2.	Burner damaged	2.	Replace burner
	3.	Gas regulator defective	3.	Replace gas regulator
Yellow flame during burner combustion	1.	Not enough air	1.	Check burner for dirt and debris. If
				found, clean burner (see Cleaning and
				Maintenance, page 13)
	2.	Gas regulator defective	2.	Replace gas regulator
Slight smoke or odor during initial operation	1.	Residues from manufacturing processes	1.	Problem will stop after a few hours of
				operation
Heater produces a whistling noise when	1.	Turning control knob to HI position	1.	Turn control knob to LO position and
burner is lit		when burner is cold		let warm up for a minute
	2.	Air in gas line	2.	Operate burner until air is removed from
				line. Have gas line checked by local
				natural gas company
	3.	Air passageways on heater blocked	3.	Observe minimum installation clear-
				ances (see Figure 4, page 7)
	4.	Dirty or partially clogged burner orifice	4.	Clean burner (see Cleaning and Mainte-
				nance, page 13) or replace burner orifice

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