Desa TPNPEA-A Technical Service, Troubleshooting, Parts Not Under Warranty, Millivolt system

Technical Service
Continued
Parts Not Under Warranty	When calling DESA, have ready
Contact authorized dealers of this product. If they	• model number of your fireplace
can’t supply original replacement part(s) call DESA	• the replacement part number
at 1-866-672-6040 for referral information.

Troubleshooting

WARNING: Turn off heater, disconnect power if applicable 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.

Note: The two most common causes of malfunctioning gas appliances are loose wiring connections and construction debris clogging pilot and/or control valve filter.

Note: Before troubleshooting the system make sure gas shut off valve is open.

Millivolt system
PROBLEM	POSSIBLE CAUSE		REMEDY
Pilot will not light	1.	No gas supply, or shutoff valve	1.	Check to see if you have gas
	2.	is OFF	2.	supply
		Air in gas line		Hold control valve in the
				PILOT position for 2 to 3
				minutes to purge air. If you
				smell gas stop and wait for a
				few minutes before trying to
	3.	Construction debris clogging	3.	light the fireplace
				Remove debris and dirt, in-
		pilot orifice		spect and clean any other
	4.	Low gas pressure	4.	possible obstructions
				Contact your gas supplier
	5.	Control valve knob is not on	5.	Refer to section on pilot
	6.	the PILOT position	6.	lighting
		Kinked pilot line		Have a qualified technician
	7.	Bad valve	7.	replace pilot line
				Replace control valve (see
				Replacement Parts and Ac-
	8.	Bad thermocouple or loose	8.	cesssories, page 34)
				Tighten thermocouple or re-
		connection		place
Pilot will not stay lit	1.	Loose wiring on thermopile to	1.	Check wiring connection. Refer
		regulator valve. No millivolt		to Wiring Diagrams, page 33
		current being sent to regulator
No gas to burner, although wall	1.	Wall switch wires defective	1.	Check electrical connections
switch and valve are set to the	2.	Thermopile generator or sensor	2.	Re-check problem "Pilot Will
ON position		not generating sufficient voltage		Not Stay Lit"
Frequent pilot outage	1.	Pilot flame may be too low,	1.	Clean and adjust pilot flame for
		causing safety pilot to “drop		maximum flame impingement
		out”		on thermopile
Pilot goes out when wall switch	1.	Millivolt output on thermopile	1.	Replace thermopile
is on		too high

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