A.O. Smith 315456-002, GAHH-40, GAHH-50 installation instructions Cont

cont.

PROBLEM POSSIBLE CAUSE(S) CORRECTIVE ACTION

	1.	Insufficient secondary air.	1.	Provide ventilation to water heater. Check
COMBUSTION ODORS				flue.
	2.	Water heater flue or vent system	2.	Clean, located source and correct.
	3.	blocked.	3.	Provide fresh air ventilation.
		Heater installed in a confined area.
	1.	Improperly sealed, hot or cold sup-	1.	Tighten threaded connections.
		ply connections, relief valve, drain
WATER LEAKS	2.	valve or thermostat threads.	2.	Inspect other appliances near water heater.
		Leakage from other appliances or
	3.	water lines.	3.	See “OPERATIONAL CONDITIONS”, sec-
		Condensation of flue products.
	4.	Excessive water pressure.	4.	tion.
				Use a pressure reducing valve and relief
	5.	Heater stacking.	5.	valve.
				Lower the thermostat setting.
	6.	Closed water system.	6.	See “Closed System/Thermal Expansion”.
	1.	Thermal expansion in closed water	1.	Install thermal expansion tank (DO NOT plug
LEAKING T&P		system.		T&P valve).
	2.	Improperly seated valve.	2.	Check relief valve for proper operation (DO
				NOT plug T&P valve.
	1.	High sulfate or mineral content in	1.	Drain and flush heater thoroughly then refill.
HOT WATER ODORS		water supply.
	2.	Bacteria in water supply.	2.	Chlorinate water supply.
	1.	Condensation dripping on burner.	1.	See “OPERATIONAL CONDITIONS”, sec-
WATER HEATER SOUNDS				tion.
	2.	Sediment at bottom of heater tank.	2.	See “MAINTENANCE OF YOUR WATER
SIZZLING-RUMBLING
				HEATER”, section.
	1.	Insufficient secondary air.	1.	Provide ventilation to water heater. Check flue
SMOKING AND CARBON				way, flue baffle, burner.
	2.	Low gas pressure.	2.	Check with gas utility company.
FORMATION (SOOTING)
	3.	Water heater flue or vent system	3.	Clean, locate source and correct.
	4.	blocked.	4.	Replace thermostat.
		Thermostat not functioning prop-
	5.	erly.	5.	Provide fresh air ventilation.
		Heater installed in a confined area.
	6.	Burner flame yellow-lazy.	6.	See “Burner Flame Yellow-Lazy”.
HEATING LIGHTS BUT	1.	Outlet polarity is reversed.	1.	Test polarity and correct.
GOES OUT IN 4-5
SECONDS
	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 needed.
HIGH OPERATION COSTS	3.	Water heater too small for job.	3.	Install adequate heater.
	4.	Wrong piping connections.	4.	Correct piping-dip tube must be in cold inlet.
	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.
THERMOSTAT FAILS TO	1.	Thermostat not functioning proper-	1.	Replace thermostat.
SHUT-OFF	2.	erly.	2.	Replace thermostat.
		Improper calibration.
CONDENSATION	1.	Thermostat set too high.	1. See “OPERATIONAL CONDITIONS” section.
	2.	Water dripping from draft hood.	2.	Provide drip “TEE” to catch condensation
				from horizontal section of exhaust vent close
				to draft hood.
	1.	Excessive water pressure.	1.	Use a pressure reducing valve and relief
DRIP FROM RELIEF VALVE	2.	Heater stacking.	2.	valve.
				Lower the thermostat setting.
	3.	Closed water system.	3.	See “CLOSED SYSTEM/THERMAL EXPAN-
				SION”, section.

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