Installation Guide

(ESM) ERROR CODE INDICATES CORRECTIVE ACTION*
E07 with an alert Icon flashing.
(also flashing red LED and beeper.)
Lower thermistor sensor failure. 1. Turn off electrical power at the breaker.
2. Disconnect and reconnect electrical connections at Electronic Thermostat
(ET).
3. Check for resistance values of either open or short circuit. If either of
these conditions are present, replace lower thermistor sensor.
4. Check for resistance values of either open or short circuit. If either of
these conditions are NOT present, replace ET.
5. Turn on electrical power at breaker.
E08 with an alert Icon flashing.
(also flashing red LED and beeper.)
Energy Smart® 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 18. NOTE: Electronic Thermostat
(ET) will continue to be operate, hot water will still be available.
5. Turn on electrical power at breaker.
E09 with an alert Icon flashing.
(also flashing red LED and beeper.)
E10
E11
E12
Electronic Thermostat (ET) error. 1. Turn off electrical power.
2. Check wiring at Electronic Thermostat (ET) for damage.
3. Turn on electrical power at breaker.
4. If this code flashes condition continues, replace the Electronic
Thermostat (ET).
E51 with an alert Icon flashing.
(also flashing red LED and beeper.)
A failure to communicate with the Electronic
Thermostat (ET).
1. Turn off electrical power at the breaker, check all electrical connections,
and wiring for damage.
2. Replace the ESM and ET.
3. Turn on electrical power at breaker.
E52 with an alert Icon flashing.
(also flashing red LED and beeper.)
Energy Smart® Module (ESM) is receiving the
wrong data from the Electronic Thermostat
(ET).
1. Turn off electrical power at the breaker, check all electrical connections,
and wiring for damage.
2. Replace the Energy Smart® Module (ESM), if this does not correct the
problem, also replace Electronic Thermostat (ET).
E55 with an alert Icon flashing.
(also flashing red LED and beeper.)
Water Leak 1. Turn off electrical power at the breaker, check all electrical connections,
and wiring for damage.
2. Check for plumbing leaks and correct accordingly.
3. If tank is leaking, replace replace unit.
E71 with an alert Icon flashing.
(also flashing red LED and beeper.)
Energy Smart® Module (ESM) thermistor
failure.
1. Turn off electrical power at the breaker, check all electrical connections,
and wiring for damage.
2. Turn on electrical power at breaker.
3. If error returns call service technician for assistance.
Residen al Electric Water Heater Use and Care Guide • 21
TROUBLESHOOTING
*These instructions are brief and intended as guidance for a qualifi ed person. If you lack the necessary skills to perform
these procedures call
Technical Assistance Hotline which is listed on the water heater’s warranty sheet for assistance.