Desa VML27NR installation manual Observed Problem Possible Cause Remedy

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TROUBLESHOOTING

TROUBLESHOOTING

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OBSERVED PROBLEM POSSIBLE CAUSE REMEDY

Burner does not light after ODS/pilot is lit	1.	Burner orifice clogged
	2.	Inlet gas pressure is too low
	3.	Thermopile leads disconnected or im-
		properly connected
	4.	Burners will not come on in remote
		position

1.Clean burner (see Cleaning and Mainte- nance, page 18) or replace burner orifice

2.Contact local natural or propane/LP gas company

3.Reconnect leads (see Wiring Diagram, page 18)

4.Replace battery in transmitter and re- ceiver

Delayed ignition burner	1.	Manifold pressure is too low	1.	Contact local natural or propane/LP gas
				company
	2.	Burner orifice clogged	2.	Clean burner (see Cleaning and Mainte-
				nance, page 18) or replace burner orifice
Burner backfiring during combustion	1.	Burner orifice is clogged or damaged	1.	Clean burner (see Cleaning and Mainte-
				nance, page 18) or replace burner orifice
	2.	Damaged burner	2.	Replace damaged burner
	3.	Gas regulator defective	3.	Replace gas control
Slight smoke or odor during initial operation	1.	Not enough air	1.	Check burner for dirt and debris. If
				found, clean burner (see Cleaning and
				Maintenance, page 18)
	2.	Gas regulator defective	2.	Replace gas control
	3.	Residues from manufacturing processes	3.	Problem will stop after a few hours of
		and logs curing		operation
Moisture/condensation noticed on windows	1.	Not enough combustion/ventilation air	1.	Refer to Air for Combustion and Venti-
				lation requirements (page 4)
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 or propane/LP gas company
	3.	Air passageways on heater blocked	3.	Observe minimum installation clear-
				ances (see pages 7 through 9)
	4.	Dirty or partially clogged burner orifice	4.	Clean burner (see Cleaning and Mainte-
				nance, page 18) or replace burner orifice

White powder residue forming within burner box or on adjacent walls or furniture

1.When heated, vapors from furniture pol- ish, wax, carpet cleaners, etc. may turn into white powder residue

1.Turn heater off when using furniture polish, wax, carpet cleaners, or similar products

Remote does not function	1. Battery is not installed. Battery power
	is low

1.Replace 9-volt batteries in receiver and remote control

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