Desa LSL18NT, LSL18PT, SL18NT, SL18PT, VSL18NT, VSL18PT ODS/pilot lights but flame

TROUBLESHOOTING

Continued

OBSERVED PROBLEM	POSSIBLE CAUSE		REMEDY
ODS/pilot lights but flame	1. Control knob not fully pressed in		1.	Press in control knob fully
goes out when control knob is	2. Control knob not pressed in		2.	After ODS/pilot lights, keep
released		long enough		control knob pressed in 30
	3.	Safety interlock system has		seconds
			3.	Wait one minute for safety in-
		been triggered		terlock system to reset. Repeat
	4.	Equipment shutoff valve not		ignition operation
			4.	Fully open equipment shutoff
		fully open		valve
	5.	Thermocouple connection	5.	Hand tighten until snug, then
		loose at control valve		tighten 1/4 turn more
	6.	Pilot flame not touching ther-	6.	A) Contact local natural or
		mocouple, which allows ther-		propane/LP gas company
		mocouple to cool, causing		B) Clean ODS/pilot (see
		pilot flame to go out. This
		problem could be caused by		Cleaning and Maintenance,
		one or both of the following:		page 17) or replace ODS/pilot
		A) Low gas pressure		assembly
		B) Dirty or partially clogged
		ODS/pilot
	7.	Thermocouple damaged	7.	Replace pilot assembly
	8.	Control valve damaged	8.	Replace control valve
Burner does not light after	1. Burner orifice is clogged		1.	Clean burner (see Cleaning
ODS/pilot is lit				and Maintenance, page 17)
				or replace burner orifice
	2.	Inlet gas pressure is too low	2.	Contact local natural or pro-
				pane/LP gas company
Delayed ignition of burner	1. Manifold pressure is too low		1.	Contact local natural or pro-
				pane/LP gas company
	2.	Burner orifice is clogged	2.	Clean burner (see Cleaning
				and Maintenance, page 17)
				or replace burner orifice
Burner backfiring during com-	1. Burner orifice is clogged or		1.	Clean burner (see Cleaning
bustion		damaged		and Maintenance, page 17)
				or replace burner orifice
	2.	Burner damaged	2.	Replace burner
	3.	Gas regulator defective	3.	Replace gas regulator

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