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*These instructions are brief and intended as guidance for a qualifi ed person. If you lack the necessary
skills to perform these procedures call 1-877-817-6750 for assistance.
Diagnostic Code Chart Electronic Thermostat (ET)
(ESM)
ERROR CODE
(ET)
DIAGNOSTIC LED
INDICATES CORRECTIVE ACTION*
LIGHT ON
(Green Flash)
Normal operation. None
NO LIGHT No electrical power to control board
or diagnostic LED light burned out.
1. Check for blown fuses or tripped breaker.
2. If diagnostic LED light is burned out, replace Electronic Thermostat
(ET).
E01
1 FLASH
(Red)
Dry-fire, electrical power on with the
tank not completely full of water.
1. Turn off electrical power at breaker, add water.
2. Turn on electrical power at breaker.
3. See “Water Heater Start-Up” on page 10.
E02
2 FLASHES
(Red)
Water temperature exceeded high
limit.
1. Turn off electrical power at the breaker.
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
(Red)
Upper thermistor sensor failure.
(Note: Upper thermistor sensor is
part of the ET)
1. Turn off electrical power at the breaker.
2. Replace Electronic Thermostat (ET).
3. Turn on electrical power at breaker.
E04
4 FLASHES
(Red)
Upper element circuit failure.
(Note: Lower element is still operable)
1. Turn off electrical power at the breaker.
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
(Red)
Lower element circuit failure.
(Note: Upper element is still operable)
1. Turn off electrical power at the breaker.
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
(Red)
Electronic Thermostat (ET) failure
(Internal processor).
1. Turn off electrical power at the breaker. Now turn on electrical power to
see if error clears. If error has not cleared, replace Electronic Thermo-
stat (ET).
2. Turn on electrical power at breaker.
E07
7 FLASHES
(Red)
Lower thermistor sensor failure. 1. Turn off electrical power at the breaker.
2. Check electrical connections at Electronic Thermostat (ET).
3. Replace Lower Thermistor Sensor.
4. Turn on electrical power at breaker.
E08
8 FLASHES
(Red)
Energy Smart
®
Interface
Module(ESM) failure.
1. Turn off electrical power.
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.
Setpoint
Knob
Diagnostic
LED Light
Plastic Guard
Electrical Shock Hazard
Do not remove the plastic
guard from over wiring.
Do not touch electrical wiring.
Failure to do so can result in
death or electrical shock.
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.
If the instructions are not clear, contact a qualifi ed
person.