A.O. Smith HYB-90N warranty Troubleshooting

TROUBLESHOOTING

These guidelines should be utilized by a qualified service agent.

Problem	Possible Cause(s)	What to do
NOT ENOUGH HOT WATER	STANDBY button turned off.	Press switch to turn heater on.
	No power at outlet.	Repair service to outlet.
	Error Code being displayed	Refer to “FAULT INDICATION AND
		ERROR CODES” section and Table
		5 or call service agency or dealer.
	Set point set too low.	Adjust Set point higher.
	Heater undersized.	Reduce hot water use.
	Low gas pressure	Contact dealer.
	Incoming water is usually cold.	Allow more time for heater to reheat.
	Leaking hot water pipes of fixtures.	Have plumber check and repair
		leaks.
CONDENSATION	Water on the floor under heater.	See CONDENSATE section.
WATER LEAKS	Improperly sealed, hot or cold supply	Check for leaks. See Figure 40.
	connections, relief valve, drain valve
	or thermostat threads.
	Leakage from other appliances or	Inspect other appliances near water
	water lines.	heater.
	Condensation of flue products.	Refer to CONDENSATE section.
LEAKING T&P	Thermal expansion in closed water	Install thermal expansion tank (Do
	system.	not plug T&P valve).
	Improperly sealed valve.	Check relief valve for proper
		operation (Do not plug T&P valve).
HOT WATER ODORS (refer to	High sulfate or mineral content in	Drain and flush heater thoroughly
cathodic protection)	water supply.	then refill.
	Bacteria in water supply.	Chlorinate water supply.
HOT WATER TOO HOT	Thermostat set too high.	Refer to TEMPERATURE
		REGULATION section.
WATER HEATER SOUNDS	Condensation dripping on burner.	Refer to CONDENSATE above.
SIZZLING - RUMBLING NOISE	Sediment at bottom of heater tank.	Clean sediment from tank. Refer to
		DRAINING.
SOOTING	Improper combustion.	Refer to Air Requirements.
BURNER WILL NOT STAY LIT-	High ambient room temperature.	Contact a qualified service agency to
GOES OUT 4-5 SECONDS		determine cause.
	Defective Control board.	Replace Control board.
	Damaged Flame Sensor	Replace Flame Sensor
	(Error code E35)
VENT GAS ODORS	Lack of air supply.	Shut off water heater immediately
	Improperly installed vent piping.	and contact a qualified service
		agency to determine cause.
	Downdraft
	Poor Combustion
THERE IS NO WATER AT ALL	The unit display is flashing an error	Check if there is any error code
WHEN THE HOT WATER TAP IS	code.	flashing on the remote controller.
OPENED.
	TABLE 6

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