Desa 35-R owner manual Troubleshooting, Symptom Possible Cause Remedy

TROUBLESHOOTING

WARNING: Never attempt to service heater while it is connected to propane supply, operating or hot. Severe burns can occur.

SYMPTOM	POSSIBLE CAUSE		REMEDY
Burner fails to light	1. Gas supply valve closed		1.	Open gas supply valve slowly
	2.	Excess-flow check valve	2.	Close propane supply valve
		closed		on propane tank and reopen
	3.	Blockage in burner orifice		slowly
			3.	Replace burner orifice
	4.	Piezo ignition system not	4.	Assure ignitor electrode gap is
		sparking		5.0 mm (0.195 in). Check wire
				lead for damage Replace piezo
				ignitor and/or ignitor electrode
				as necessary. Do not bend elec-
				trode, this may cause breakage
Pilot lights but goes out when	1. Not enough warm-up time		1.	Relight, hold automatic control
automatic control valve button				valve button in 45 seconds
is released	2. Low gas pressure		2.	Check for proper gas supply
	3.	Thermocouple loose or needs	3.	Tighten connection or replace
		to be replaced		thermocouple
	4.	Automatic control valve needs	4.	Replace automatic control
		to be replaced		valve
Burn rate is low	1. Plugged gas orifices		1.	Replace gas orifice
	2.	Low gas pressure	2.	Check gas supply; check
	3.	Low fuel supply		regulator output
			3.	Consult gas supplier to deter-
				mine adequate supply. Tank
				could be empty
Burner lights but goes out when	1. Loose wires on tip over		1.	Tighten wires on tip over
button is released		switch		switch
	2.	Loose or broken lead wire	2.	Tighten or repair wire
	3.	Loose or mislocated thermo-	3.	Tighten thermocouple. Make
		couple wire		sure thermocouple is located
				correctly between reverbera-
				tor and grid
	4.	Defective thermocouple	4.	Replace thermocouple
	5.	Defective control	5.	Replace control
	6.	Defective tip over switch	6.	Replace tip over switch

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