A.O. Smith EJCN-40, EJC-30 Troubleshooting Guidelines, Problem Possible Causes Corrective Action

TROUBLESHOOTING GUIDELINES

These guidelines should be utilized by a qualified service agent.

Problem	Possible Cause(s)	Corrective Action
WATER LEAKS	Improperly sealed, hot or cold supply	Tighten threaded connections.
(See Leakage Checkpoints on 19)	connection, relief valve or drain valve.
	Leakage from other appliances or water lines.	Inspect other appliances near water heater.
NO HOT WATER	No power to heater.	Turn on electrical switch. Check for blown
		fuses or tripped breaker.
	High Temperature Limit Switch open.	Reset. Check for source of trouble and correct.
	Non-functioning upper thermostat.	Replace thermostat.
INSUFFICIENT HOT WATER	Non-functioning thermostats.	Replace thermostats.
	Non-functioning lower element.	Replace element.
	Improper calibration.	Replace thermostats.
	Thermostats set too low.	Set thermostats to desired temperature.
	Sediment or lime in tank.	Drain. Determine if water treatment is needed.
	Heater too small for job.	Install adequate water heater.
	Wrong piping connections.	Correct piping.
	Leaking faucets.	Repair faucets.
	Wasted hot water.	Review and reduce hot water consumption.
	Long runs of exposed pipe.	Insulate piping.
	Hot water piping on outside wall.	Insulate piping.
HIGH OPERATION COSTS	Improper Calibration.	Replace thermostats.
	Thermostats set too high.	Set thermostat to desired setting.
	Sediment or lime in tank.	Drain. Flush-Provide water treatment if needed.
	Heater too small for job.	Install adequate heater.
	Wrong piping connections.	Correct piping.
	Leaking faucets.	Repair faucets.
	Wasted hot water.	Review and reduce hot water consumption.
	Long runs of exposed piping.	Insulate piping.
	Hot water piping in exposed wall.	Insulate piping.
SLOW HOT WATER RECOVERY	Non-functioning upper element.	Replace element.
	Non-functioning lower element.	Replace element.
DRIP FROM RELIEF VALVE	Excessive water pressure.	Use Pressure Reducing Valve and Pressure
		Relief Valve.
	Closed system.	See “Thermal Expansion” in the For Your
		Information section.
THERMOSTAT DOES NOT SHUT OFF	Non-functioning thermostats.	Replace thermostats.
	Improper calibration.	Replace thermostats.
WATER ODOR	Sulfides in the water.	See “Operational Conditions” in the For Your
		Information section.
WATER HEATER SOUNDS	Scale accumulation on elements.	Contact dealer to clean or replace elements.

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