A.O. Smith GDVT instruction manual Troubleshooting Guidelines, Problem Possible Causes Correction

TROUBLESHOOTING GUIDELINES

PROBLEM		POSSIBLE CAUSE(S)		CORRECTION
	1.	Pilot not lit	1.	Light pilot
	2.	Thermostat set too low	2.	Turn temp. dial to desired temperature
	3.	No gas	3.	Check with gas utility company
	4.	Dirt in the gas lines	4.	Notify utility-install trap in gas line
BURNER WILL NOT IGNITE	5.	Pilot line clogged	5.	Clean, locate source and correct
	6.	Main burner line clogged	6.	Clean, locate source and correct
	7.	Defective thermocouple	7.	Replace thermocouple
	8.	Defective gas control/thermostat	8.	Replace gas control/thermostat
	9.	Heater installed in a confined area	9.	Provide fresh air ventilation
SMELLY WATER	1.	Sulfur in the water	1.	Replace the anode with a special anode
	1.	Insufficient secondary air	1.	Provide ventilation to water heater
	2.	Low gas pressure	2.	Check with gas utility company
BURNER FLAME YELLOW-	3.	Flue clogged	3.	Clean, locate source and correct
LAZY	4.	Main burner line clogged	4.	Clean, locate source and correct
	5.	Heater installed in a confined area	5.	Proper fresh air ventilation
	6.	Obstruction in main burner orifice	6.	Clean or replace orifice
	1.	Air in gas line	1.	Bleed the air from the gas line
	2.	No gas	2.	Check with gas utility company
	3.	Dirt in gas lines	3.	Notify utility-install dirt trap in gas line
	4.	Pilot line or orifice clogged	4.	Clean, locate source and correct
	5.	Thermocouple connection loose	5.	Finger tighten: then 1/4 turn with wrench
	6.	Defective thermocouple	6.	Replace thermocouple
	7.	Cold drafts	7.	Locate source and correct
	8.	Gas control/thermostat ECO switch open	8.	Replace gas control/thermostat
PILOT WILL NOT LIGHT OR	9.	Door-mount temperature cut-off (TCO)	9.	Call a qualified service technician
REMAIN LIT		switch activated.
	10. Defective igniter or electrode		10. Replace igniter or pilot assembly
	11. Flammable vapors incident, Flame GuardTM		11. Replace water heater, eliminate flammable
		function activated		vapors source. Call a qualified service tech-
				nician
	12. Low gas pressure		12. Check with gas utility company
	13. Improper installation of the quick connects		13. Reset the TCO - switch. Check if the quick
		in the TCO-switch, loose connection or inter-		connects are firmly inserted on TCO switch
		rupted gas control leads.		contacts.
	1.	Thermostat set too high	1.	Set temperature dial to lower setting
	2.	Sediment or lime in tank	2.	Drain/Flush-Provide water treatment if need-
				ed
	3.	Water heater too small for job	3.	Install adequate size heater
	4.	Wrong piping connections	4.	Correct piping-dip tube must be in cold inlet
HIGH OPERATION COSTS	5.	Leaking faucets	5.	Repair faucets
	6.	Gas leaks	6.	Check with utility-repair at once
	7.	Wasted hot water	7.	Advise customer
	8.	Long runs of exposed piping	8.	Insulate piping
	9.	Hot water piping in exposed wall	9.	Insulate piping
	10. Leaks or cracks in dip tube		10. Check dip tube. Replace if faulty
	1.	Pilot line or orifice clogged	1.	Clean, locate source and correct
PILOT FLAME TOO SMALL	2.	Low gas pressure	2.	Check with gas utility company
	3.	Defective pilot	3.	Replace pilot
	1.	Thermostat set too low	1.	Turn temperature dial to desired setting
	2.	Sediment or lime in tank	2.	Drain/flush-provide water treatment if need-
				ed
	3.	Water heater too small	3.	Install adequate size heater
INSUFFICIENT HOT WATER	4.	Wrong piping connections	4.	Correct piping-dip tube must be in cold inlet
	5.	Leaking faucets	5.	Repair faucets
	6.	Wasted hot water	6.	Advise customer
	7.	Long runs of exposed piping	7.	Insulate piping
	8.	Hot water piping in outside wall	8.	Insulate piping
	9.	Low gas pressure	9.	Check with gas utility company

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