Troubleshooting

TROUBLESHOOTING

Note: Before troubleshooting the system, make sure the gas shutoff valve is ON.

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

WARNING: Turn off heater and let cool before servicing. 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.

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
				that equipment shutoff valve is opened
	2.	Air in gas line	2.	Repeat lighting procedure several times
				to purge all air out of lines. If after re-
				peated attempts appliance does not light,
				call for qualiﬁed service and repair.
	3.	Construction debris clogging pilot oriﬁce	3.	Remove debris and dirt, inspect and
				clean any other possible obstructions
	4.	Low gas pressure	4.	Contact your gas supplier to check
				pressure
	5.	Kinked pilot line	5.	Have a qualiﬁed technician replace pilot
				line
	6.	Control valve is not opeining	6.	Replace control valve (Refer to Replace-
				ment Parts, page 28)
	7.	No power to unit or the ignition module	7.	Check that main power is on and that all
		or power transformer is bad		wire connections are made correctly to
				the ignition model (see Wiring Diagram,
				page 23). 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- erwise have the transformer replaced

Pilot will not stay lit	1.	Loose wiring on ignitor wire to ignition
		module and/or poor ground to ignition
		module
	2.	Pilot ﬂame too low to sense

1.Check wiring connection. Refer to wir- ing diagram (see Wiring Diagram, page 23) and/or check ground wire to ignition module

2.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 is	1.	Wall switch wires defective or too	1.	Check electrical connections
set to the ON position		long

Frequent pilot outage	1.	Pilot ﬂame may be too low, causing	1.	Clean and adjust pilot ﬂame for maximum
		safety pilot to “drop out”		ﬂame impingement on thermopile
	2.	Improper venting or excessive blockage	2.	Have the vent system inspected, includ-
				ing the termination cap. Remove any
				restriction or obstruction

www.desatech.com

116235-01A

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OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

ment Parts, page 28)

page 23). Check for 24 VAC at the

(V)VC36NE Series specifications