Whirlpool 318686-000 Diagnostic Code Chart Electronic Thermostat ET, person, Indicates

Diagnostic Code Chart Electronic Thermostat (ET)

IMPORTANT: Before attempting to adjust the ther- mostat, read the “Water Temperature Regulation” section page 10.

The Electronic Thermostat (ET) is designed so that it may control the water heater without the Energy Smart® Module (ESM) being operated, see page 12.

Diagnostic

LED Light

Setpoint

Knob

Electrical Shock Hazard

Do not remove the plactic guard from over wiring.

If the instructions are not clear, contact a qualified

person. Plastic Guard

Do not touch electrical wiring.

Failure to do so can result in death or electrical shock.

(ESM)	(ET)	INDICATES		CORRECTIVE ACTION*
ERROR CODE	DIAGNOSTIC LED
	LIGHT ON	Normal operation.	None
	(Green Flash)
	NO LIGHT	No electrical power to control board	1.	Check for blown fuses or tripped breaker.
		or diagnostic LED light burned out.	2.	If diagnostic LED light is burned out, replace Electronic Thermostat
				(ET).
E01	1 FLASH	Dry-fire, electrical power on with the	1.	Turn off electrical power at breaker, add water.
	(Red)	tank not completely full of water.	2.	Turn on electrical power at breaker.
			3.	See “Water Heater Start-Up” on page 10.
E02	2 FLASHES	Water temperature exceeded high	1.	Turn off electrical power at the breaker.
	(Red)	limit.	2.	Press the reset button (see Figure 10A).
			3.	Turn on electrical power at breaker.
			4.	If error returns call a service technician for assistance.
E03	3 FLASHES	Upper thermistor sensor failure.	1.	Turn off electrical power at the breaker.
	(Red)	(Note: Upper thermistor sensor is	2.	Replace Electronic Thermostat (ET).
		part of the ET)	3.	Turn on electrical power at breaker.
E04	4 FLASHES	Upper element circuit failure.	1.	Turn off electrical power at the breaker.
	(Red)	(Note: Lower element is still operable)	2.	Check element circuits for resistance of 5-25 ohms (replace if required).
			3.	Check wires at elements and Electronic Thermostat (ET) for damage.
				If this 4 flashes condition continues, replace Electronic Thermostat (ET).
			4.	Turn on electrical power at breaker.
E05	5 FLASHES	Lower element circuit failure.	1.	Turn off electrical power at the breaker.
	(Red)	(Note: Upper element is still operable)	2.	Check element circuits for resistance of 5-25 ohms (replace if required).
			3.	Check wires at elements and Electronic Thermostat (ET) for damage.
				If this 5 flashes condition continues, replace Electronic Thermostat (ET).
			4.	Turn on electrical power at breaker.
E06	6 FLASHES	Electronic Thermostat (ET) failure	1.	Turn off electrical power at the breaker. Now turn on electrical power to
	(Red)	(Internal processor).		see if error clears. If error has not cleared, replace Electronic Thermo-
				stat (ET).
			2.	Turn on electrical power at breaker.
E07	7 FLASHES	Lower thermistor sensor failure.	1.	Turn off electrical power at the breaker.
	(Red)		2.	Check electrical connections at Electronic Thermostat (ET).
			3.	Replace Lower Thermistor Sensor.
			4.	Turn on electrical power at breaker.
E08	8 FLASHES	Energy Smart® Interface	1.	Turn off electrical power.
	(Red)	Module(ESM) failure.	2.	Check wires at the interface module for damage.
			3.	If this 8 flashes condition continues, replace module (ESM).
			4.	See “Overriding The Interface Module (ESM)” by unplugging from the
				Electronic Thermostat (ET) on page 12. NOTE: Electronic Thermostat
				(ET) will continue to be operate, hot water will still be available.
			5.	Turn on electrical power at breaker.

*These instructions are brief and intended as guidance for a qualified person. If you lack the necessary

skills to perform these procedures call 1-877-817-6750 for assistance.

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