Desa VV36EPC1 SERIES Troubleshooting, Observed Problem, Possible Cause, Remedy, ment Parts, page

Troubleshooting

WARNING: Turn off heater and let cool before ser- vicing. Only a qualified service person should service and repair heater.

CAUTION: Never use a wire, needle, or similar object

to clean pilot. This can damage pilot unit.

Note: All troubleshooting items are listed in order of operation.

The two most common causes of a malfunctioning gas appliance are:

1. Loose wiring connections

2. Construction debris clogging the pilot and/or gas control valve filter

OBSERVED PROBLEM	POSSIBLE CAUSE		REMEDY
Ignitor will not spark or pilot will not light	1.	No gas supply, or shutoff valve is OFF	1.	Check to see if you have gas supply and
	2.	Air in gas line	2.	that equipment shutoff valve is opened
				Repeat lighting procedure several times
				to purge all air out of lines. If after re-
				peated attempts appliance does not light,
	3.	Construction debris clogging pilot orifice	3.	call for qualified service and repair.
				Remove debris and dirt, inspect and
	4.	Low gas pressure	4.	clean any other possible obstructions
				Contact your gas supplier to check
	5.	Kinked pilot line	5.	pressure
				Have a qualified technician replace pilot
	6.	Control valve knob is not opening	6.	line
				Replace control valve (Refer to Replace-
	7.	No power to unit or the ignition module	7.	ment Parts, page 27)
				Check that main power is on and that
		or power transformer is bad		all wire connections are made correctly
				to the ignition model (see Wiring Dia-
				gram, page 21). Check for 24 VAC at the
				secondary side of the transformer. If 24
				VAC is present, and the module does not
				operate, have the module replaced oth-
	8.	Vent damper not fully open	8.	erwise have the transformer replaced.
				Open vent damper until fully locked in
				OPEN position
Pilot will not stay lit	1.	Loose wiring on ignitor wire to ignition	1.	Check wiring connection. Refer to Wir-
		module and/or poor ground to ignition		ing Diagram, page 21, and/or check
	2.	module	2.	ground wire to ignition module
		Pilot flame too low to sense		Clean and adjust pilot burner and check
				gas supply and inlet pressure to unit
				Note: Have a qualified technician replace
				pilot assembly if broken or corroded
No gas to burner, although wall switch and	1.	Wall switch wires defective or too long	1.	Check electrical connections
valve are set to the ON position
Frequent pilot outage	1.	Pilot flame may be too low, causing	1.	Clean and adjust pilot flame for maximum
	2.	safety pilot to “drop out”	2.	flame impingement on thermopile
		Improper venting or excessive blockage		Have the vent system inspected, includ-
				ing the termination cap. Remove any
				restriction or obstruction

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